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Vega-Álvarez C, Soengas P, Roitsch T, Abilleira R, Velasco P, Francisco M. Unveiling plant defense arsenal: metabolic strategies in Brassica oleracea during black rot disease. Hortic Res 2023; 10:uhad204. [PMID: 38023479 PMCID: PMC10681004 DOI: 10.1093/hr/uhad204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 10/06/2023] [Indexed: 12/01/2023]
Abstract
Alterations in plant metabolism play a key role in the complex plant-pathogen interactions. However, there is still a lack of knowledge about the connection between changes in primary and specialized metabolism and the plant defense against diseases that impact crops. Thus, we aim to study the metabolic reprograming in Brassica oleracea plants upon infection by Xanthomonas campestris pv. campestris (Xcc). To accomplish this, we utilized a combination of untargeted and targeted metabolomics, through UPLC-Q-TOF-MS/MS and 1H-NMR, in two crop lines differing in resistance that were evaluated at two- and four-week intervals following inoculation (T1 and T2, respectively). Besides, to depict the physiological status of the plant during infection, enzymatic activities related to the carbohydrate pathway and oxidative stress were studied. Our results revealed different temporal dynamics in the responses of the susceptible vs. resistant crops lines. Resistant B. oleracea line suppresses carbohydrate metabolism contributing to limit nutrient supplies to the bacterium and prioritizes the induction of defensive compounds such as indolic glucosinolates, salicylic acid, phenylpropanoids and phytoalexins precursors at early infection stages. In contrast, the susceptible line invests in carbohydrate metabolism, including enzymatic activities related to the hexoses turnover, and activates defense signaling related to reactive oxygen species. Thus, each line triggers a different metabolic strategy that will affect how the plant overcomes the disease in terms of resistance and growth. This work provides first insights of a fine-tuned metabolic regulation during Xcc infection in B. oleracea that will contribute to develop new strategies for plant disease management.
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Affiliation(s)
- Carmen Vega-Álvarez
- Group of Genetics, Breeding and Biochemistry of Brassicas,Misión Biológica de Galicia (CSIC), ES-36143, Pontevedra, Spain
| | - Pilar Soengas
- Group of Genetics, Breeding and Biochemistry of Brassicas,Misión Biológica de Galicia (CSIC), ES-36143, Pontevedra, Spain
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, DK-2630, Taastrup, Denmark
| | - Rosaura Abilleira
- Group of Genetics, Breeding and Biochemistry of Brassicas,Misión Biológica de Galicia (CSIC), ES-36143, Pontevedra, Spain
| | - Pablo Velasco
- Group of Genetics, Breeding and Biochemistry of Brassicas,Misión Biológica de Galicia (CSIC), ES-36143, Pontevedra, Spain
| | - Marta Francisco
- Group of Genetics, Breeding and Biochemistry of Brassicas,Misión Biológica de Galicia (CSIC), ES-36143, Pontevedra, Spain
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Dermastia M, Tomaž Š, Strah R, Lukan T, Coll A, Dušak B, Anžič B, Čepin T, Wienkoop S, Kladnik A, Zagorščak M, Riedle-Bauer M, Schönhuber C, Weckwerth W, Gruden K, Roitsch T, Pompe Novak M, Brader G. Candidate pathogenicity factor/effector proteins of ' Candidatus Phytoplasma solani' modulate plant carbohydrate metabolism, accelerate the ascorbate-glutathione cycle, and induce autophagosomes. Front Plant Sci 2023; 14:1232367. [PMID: 37662165 PMCID: PMC10471893 DOI: 10.3389/fpls.2023.1232367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 07/31/2023] [Indexed: 09/05/2023]
Abstract
The pathogenicity of intracellular plant pathogenic bacteria is associated with the action of pathogenicity factors/effectors, but their physiological roles for most phytoplasma species, including 'Candidiatus Phytoplasma solani' are unknown. Six putative pathogenicity factors/effectors from six different strains of 'Ca. P. solani' were selected by bioinformatic analysis. The way in which they manipulate the host cellular machinery was elucidated by analyzing Nicotiana benthamiana leaves after Agrobacterium-mediated transient transformation with the pathogenicity factor/effector constructs using confocal microscopy, pull-down, and co-immunoprecipitation, and enzyme assays. Candidate pathogenicity factors/effectors were shown to modulate plant carbohydrate metabolism and the ascorbate-glutathione cycle and to induce autophagosomes. PoStoSP06, PoStoSP13, and PoStoSP28 were localized in the nucleus and cytosol. The most active effector in the processes studied was PoStoSP06. PoStoSP18 was associated with an increase in phosphoglucomutase activity, whereas PoStoSP28, previously annotated as an antigenic membrane protein StAMP, specifically interacted with phosphoglucomutase. PoStoSP04 induced only the ascorbate-glutathione cycle along with other pathogenicity factors/effectors. Candidate pathogenicity factors/effectors were involved in reprogramming host carbohydrate metabolism in favor of phytoplasma own growth and infection. They were specifically associated with three distinct metabolic pathways leading to fructose-6-phosphate as an input substrate for glycolysis. The possible significance of autophagosome induction by PoStoSP28 is discussed.
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Affiliation(s)
- Marina Dermastia
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
| | - Špela Tomaž
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
- Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Rebeka Strah
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
- Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Tjaša Lukan
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
| | - Anna Coll
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
| | - Barbara Dušak
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
- Department of Plant and Environmental Sciences, University of Copenhagen, Taastrup, Denmark
| | - Barbara Anžič
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
| | - Timotej Čepin
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
| | - Stefanie Wienkoop
- Department of Functional and Evolutionary Ecology, Faculty of Life Sciences, University of Vienna, Vienna, Austria
| | - Aleš Kladnik
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Maja Zagorščak
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
| | - Monika Riedle-Bauer
- Federal College and Research Institute for Viticulture and Pomology Klosterneuburg, Klosterneuburg, Austria
| | - Christina Schönhuber
- Bioresources Unit, Health & Environment Department, Austrian Institute of Technology, Tulln, Austria
| | - Wolfram Weckwerth
- Department of Functional and Evolutionary Ecology, Faculty of Life Sciences, University of Vienna, Vienna, Austria
- Vienna Metabolomics Center (VIME), University of Vienna, Vienna, Austria
| | - Kristina Gruden
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, University of Copenhagen, Taastrup, Denmark
| | - Maruša Pompe Novak
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
- Faculty of Viticulture and Enology, University of Nova Gorica, Vipava, Slovenia
| | - Günter Brader
- Bioresources Unit, Health & Environment Department, Austrian Institute of Technology, Tulln, Austria
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3
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Spanic V, Vukovic A, Cseplo M, Vukovic R, Buchvaldt Amby D, Cairo Westergaard J, Puskas K, Roitsch T. Early leaf responses of cell physiological and sensor-based signatures reflect susceptibility of wheat seedlings to infection by leaf rust. Physiol Plant 2023; 175:e13990. [PMID: 37616017 DOI: 10.1111/ppl.13990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Revised: 07/12/2023] [Accepted: 07/24/2023] [Indexed: 08/25/2023]
Abstract
Leaf rust caused by Puccinia triticina Erikss. can have devastating effects on wheat (Triticum aestivum L.), causing severe economic losses. This comprehensive study serves to facilitate our understanding of the impact of carbohydrate and antioxidant metabolism in association with sensor-based phenotyping and leaf rust stress responses in wheat seedlings. After 24 h of inoculation (hai) very susceptible variety to leaf rust (Ficko) increased cell-wall invertase (cwInv; EC 3.2.1.26), compared to other varieties that significantly increased cwInv later. This could mean that the Ficko variety cannot defend itself from leaf rust infections once symptoms have started to develop. Also, Ficko had significantly decreased amounts of cytoplasmic invertase (cytInv; EC 3.2.1.26) at 8 hai. The downregulation of cytInv in susceptible plants may facilitate the maintenance of elevated apoplastic sucrose availability favoring the pathogen. The significant role of vacuolar invertase (vacInv; EC 3.2.1.26) in moderately resistant varieties was recorded. Also, a significant decrease of glucose-6-phosphate dehydrogenase (G6PDH; EC 1.1.1.49) and UDP-glucose pyrophosphorylase (UGPase; EC 2.7.7.9) in moderately resistant varieties might restrict normal development of leaf rust due to reduced sugar. During plant-pathogen interaction, when the invader spreads systemically throughout the plant, the main role of ascorbate peroxidase (APX; EC 1.11.1.11) activity in one moderately resistant variety (Olimpija) and catalase (CAT; EC 1.11.1.6) activity in another moderately resistant variety (Alka) is to protect the plant against oxidative damage in the early stages of infection. Non-invasive phenotyping with a sensor-based technique could be used as a rapid method for pre-symptomatic determination of wheat leaf rust resistance or susceptibility.
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Affiliation(s)
- Valentina Spanic
- Department of Small Cereal Crops Breeding and Genetics, Agricultural Institute Osijek, Osijek, Osijek, Croatia
| | - Ana Vukovic
- Department of Biology, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
| | - Monika Cseplo
- Agricultural Institute, Centre for Agricultural Research, Martonvásár, Hungary
| | - Rosemary Vukovic
- Department of Biology, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
| | - Daniel Buchvaldt Amby
- Department of Plant and Environmental Sciences, University of Copenhagen, Section for Crop Sciences, Taastrup, Denmark
| | - Jesper Cairo Westergaard
- Department of Plant and Environmental Sciences, University of Copenhagen, Section for Crop Sciences, Taastrup, Denmark
| | - Katalin Puskas
- Agricultural Institute, Centre for Agricultural Research, Martonvásár, Hungary
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, University of Copenhagen, Section for Crop Sciences, Taastrup, Denmark
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4
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Pottier D, Roitsch T, Persson S. Cell wall regulation by carbon allocation and sugar signaling. Cell Surf 2023. [DOI: 10.1016/j.tcsw.2023.100096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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5
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Correia PMP, Cairo Westergaard J, Bernardes da Silva A, Roitsch T, Carmo-Silva E, Marques da Silva J. High-throughput phenotyping of physiological traits for wheat resilience to high temperature and drought stress. J Exp Bot 2022; 73:5235-5251. [PMID: 35446418 PMCID: PMC9440435 DOI: 10.1093/jxb/erac160] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Accepted: 04/20/2022] [Indexed: 05/30/2023]
Abstract
Interannual and local fluctuations in wheat crop yield are mostly explained by abiotic constraints. Heatwaves and drought, which are among the top stressors, commonly co-occur, and their frequency is increasing with global climate change. High-throughput methods were optimized to phenotype wheat plants under controlled water deficit and high temperature, with the aim to identify phenotypic traits conferring adaptative stress responses. Wheat plants of 10 genotypes were grown in a fully automated plant facility under 25/18 °C day/night for 30 d, and then the temperature was increased for 7 d (38/31 °C day/night) while maintaining half of the plants well irrigated and half at 30% field capacity. Thermal and multispectral images and pot weights were registered twice daily. At the end of the experiment, key metabolites and enzyme activities from carbohydrate and antioxidant metabolism were quantified. Regression machine learning models were successfully established to predict plant biomass using image-extracted parameters. Evapotranspiration traits expressed significant genotype-environment interactions (G×E) when acclimatization to stress was continuously monitored. Consequently, transpiration efficiency was essential to maintain the balance between water-saving strategies and biomass production in wheat under water deficit and high temperature. Stress tolerance included changes in carbohydrate metabolism, particularly in the sucrolytic and glycolytic pathways, and in antioxidant metabolism. The observed genetic differences in sensitivity to high temperature and water deficit can be exploited in breeding programmes to improve wheat resilience to climate change.
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Affiliation(s)
| | - Jesper Cairo Westergaard
- Department of Plant and Environmental Sciences, Section of Crop Science, Copenhagen University, Højbakkegård Allé 13, 2630 Tåstrup, Denmark
| | - Anabela Bernardes da Silva
- BioISI – Biosystems & Integrative Sciences Institute, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Section of Crop Science, Copenhagen University, Højbakkegård Allé 13, 2630 Tåstrup, Denmark
- Department of Adaptive Biotechnologies, Global Change Research Institute, CAS, 603 00 Brno, Czech Republic
| | | | - Jorge Marques da Silva
- BioISI – Biosystems & Integrative Sciences Institute, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
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Jammer A, Akhtar SS, Amby DB, Pandey C, Mekureyaw MF, Bak F, Roth PM, Roitsch T. Enzyme activity profiling for physiological phenotyping within functional phenomics: plant growth and stress responses. J Exp Bot 2022; 73:5170-5198. [PMID: 35675172 DOI: 10.1093/jxb/erac215] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 05/25/2022] [Indexed: 06/15/2023]
Abstract
High-throughput profiling of key enzyme activities of carbon, nitrogen, and antioxidant metabolism is emerging as a valuable approach to integrate cell physiological phenotyping into a holistic functional phenomics approach. However, the analyses of the large datasets generated by this method represent a bottleneck, often keeping researchers from exploiting the full potential of their studies. We address these limitations through the exemplary application of a set of data evaluation and visualization tools within a case study. This includes the introduction of multivariate statistical analyses that can easily be implemented in similar studies, allowing researchers to extract more valuable information to identify enzymatic biosignatures. Through a literature meta-analysis, we demonstrate how enzyme activity profiling has already provided functional information on the mechanisms regulating plant development and response mechanisms to abiotic stress and pathogen attack. The high robustness of the distinct enzymatic biosignatures observed during developmental processes and under stress conditions underpins the enormous potential of enzyme activity profiling for future applications in both basic and applied research. Enzyme activity profiling will complement molecular -omics approaches to contribute to the mechanistic understanding required to narrow the genotype-to-phenotype knowledge gap and to identify predictive biomarkers for plant breeding to develop climate-resilient crops.
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Affiliation(s)
- Alexandra Jammer
- Institute of Biology, University of Graz, NAWI Graz, Schubertstraße 51, 8010 Graz, Austria
| | - Saqib Saleem Akhtar
- Department of Plant and Environmental Sciences, Section of Crop Science, University of Copenhagen, Copenhagen, Denmark
| | - Daniel Buchvaldt Amby
- Department of Plant and Environmental Sciences, Section of Crop Science, University of Copenhagen, Copenhagen, Denmark
| | - Chandana Pandey
- Department of Plant and Environmental Sciences, Section of Crop Science, University of Copenhagen, Copenhagen, Denmark
| | - Mengistu F Mekureyaw
- Department of Plant and Environmental Sciences, Section of Crop Science, University of Copenhagen, Copenhagen, Denmark
| | - Frederik Bak
- Department of Plant and Environmental Sciences, Section of Microbial Ecology and Biotechnology, University of Copenhagen, Copenhagen, Denmark
| | - Peter M Roth
- Institute for Computational Medicine, University of Veterinary Medicine Vienna, Vienna, Austria
- International AI Future Lab, Technical University of Munich, Munich, Germany
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Section of Crop Science, University of Copenhagen, Copenhagen, Denmark
- Department of Adaptive Biotechnologies, Global Change Research Institute, Czech Academy of Sciences, Brno, Czech Republic
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Roitsch T, Himanen K, Chawade A, Jaakola L, Nehe A, Alexandersson E. Functional phenomics for improved climate resilience in Nordic agriculture. J Exp Bot 2022; 73:5111-5127. [PMID: 35727101 PMCID: PMC9440434 DOI: 10.1093/jxb/erac246] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 06/06/2022] [Indexed: 05/26/2023]
Abstract
The five Nordic countries span the most northern region for field cultivation in the world. This presents challenges per se, with short growing seasons, long days, and a need for frost tolerance. Climate change has additionally increased risks for micro-droughts and water logging, as well as pathogens and pests expanding northwards. Thus, Nordic agriculture demands crops that are adapted to the specific Nordic growth conditions and future climate scenarios. A focus on crop varieties and traits important to Nordic agriculture, including the unique resource of nutritious wild crops, can meet these needs. In fact, with a future longer growing season due to climate change, the region could contribute proportionally more to global agricultural production. This also applies to other northern regions, including the Arctic. To address current growth conditions, mitigate impacts of climate change, and meet market demands, the adaptive capacity of crops that both perform well in northern latitudes and are more climate resilient has to be increased, and better crop management systems need to be built. This requires functional phenomics approaches that integrate versatile high-throughput phenotyping, physiology, and bioinformatics. This review stresses key target traits, the opportunities of latitudinal studies, and infrastructure needs for phenotyping to support Nordic agriculture.
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Affiliation(s)
- Thomas Roitsch
- Department of Plant and Environmental Sciences, University of Copenhagen, Denmark
- Department of Adaptive Biotechnologies, Global Change Research Institute, Czech Academy of Sciences, Brno, Czechia
| | - Kristiina Himanen
- National Plant Phenotyping Infrastructure, HiLIFE, University of Helsinki, Finland
- Organismal and Evolutionary Biology Research Program, Viikki Plant Science Centre, Faculty of Biological and Environmental Sciences, University of Helsinki, Finland
| | - Aakash Chawade
- Department of Plant Breeding, Swedish University of Agricultural Sciences, Lomma, Sweden
| | - Laura Jaakola
- Climate laboratory Holt, Department of Arctic and Marine Biology, UiT the Arctic University of Norway, Tromsø, Norway
- NIBIO, Norwegian Institute of Bioeconomy Research, Ås, Norway
| | - Ajit Nehe
- Department of Plant Breeding, Swedish University of Agricultural Sciences, Lomma, Sweden
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8
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De Rocchis V, Jammer A, Camehl I, Franken P, Roitsch T. Tomato growth promotion by the fungal endophytes Serendipita indica and Serendipita herbamans is associated with sucrose de-novo synthesis in roots and differential local and systemic effects on carbohydrate metabolisms and gene expression. J Plant Physiol 2022; 276:153755. [PMID: 35961165 DOI: 10.1016/j.jplph.2022.153755] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 05/24/2022] [Accepted: 06/08/2022] [Indexed: 05/28/2023]
Abstract
Plant growth-promoting and stress resilience-inducing root endophytic fungi represent an additional carbohydrate sink. This study aims to test if such root endophytes affect the sugar metabolism of the host plant to divert the flow of resources for their purposes. Fresh and dry weights of roots and shoots of tomato (Solanum lycopersicum) colonised by the closely related Serendipita indica and Serendipita herbamans were recorded. Plant carbohydrate metabolism was analysed by measuring sugar levels, by determining activity signatures of key enzymes of carbohydrate metabolism, and by quantifying mRNA levels of genes involved in sugar transport and turnover. During the interaction with the tomato plants, both fungi promoted root growth and shifted shoot biomass from stem to leaf tissues, resulting in increased leaf size. A common effect induced by both fungi was the inhibition of phosphofructokinase (PFK) in roots and leaves. This glycolytic-pacing enzyme shows how the glycolysis rate is reduced in plants and, eventually, how sugars are allocated to different tissues. Sucrose phosphate synthase (SPS) activity was strongly induced in colonised roots. This was accompanied by increased SPS-A1 gene expression in S. herbamans-colonised roots and by increased sucrose amounts in roots colonised by S. indica. Other enzyme activities were barely affected by S. indica, but mainly induced in leaves of S. herbamans-colonised plants and decreased in roots. This study suggests that two closely related root endophytic fungi differentially influence plant carbohydrate metabolism locally and systemically, but both induce a similar increase in plant biomass. Notably, both fungal endophytes induce an increase in SPS activity and, in the case of S. indica, sucrose resynthesis in roots. In leaves of S. indica-colonised plants, SWEET11b expression was enhanced, thus we assume that excess sucrose was exported by this transporter to the roots. .
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Affiliation(s)
- Vincenzo De Rocchis
- Leibniz Institute of Vegetable and Ornamental Crops, Theodor-Echtermeyer-Weg 1, 14979, Großbeeren, Germany
| | - Alexandra Jammer
- Institute of Biology, University of Graz, NAWI Graz, Schubertstraße 51, 8010, Graz, Austria
| | - Iris Camehl
- Leibniz Institute of Vegetable and Ornamental Crops, Theodor-Echtermeyer-Weg 1, 14979, Großbeeren, Germany
| | - Philipp Franken
- Leibniz Institute of Vegetable and Ornamental Crops, Theodor-Echtermeyer-Weg 1, 14979, Großbeeren, Germany
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark; Department of Adaptive Biotechnologies, Global Change Research Institute, Czech Academy of Sciences, Brno, Czech Republic.
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Mekureyaw MF, Pandey C, Hennessy RC, Nicolaisen MH, Liu F, Nybroe O, Roitsch T. The cytokinin-producing plant beneficial bacterium Pseudomonas fluorescens G20-18 primes tomato (Solanum lycopersicum) for enhanced drought stress responses. J Plant Physiol 2022; 270:153629. [PMID: 35151004 DOI: 10.1016/j.jplph.2022.153629] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 12/24/2021] [Accepted: 01/19/2022] [Indexed: 05/27/2023]
Abstract
Plant growth-promoting rhizobacteria (PGPR) are known for exerting beneficial effects on plant growth and tolerance to plant pathogens. However, their specific role in mediating protection against abiotic stress remains underexplored. The aim of this study was to characterise the ability of the cytokinin-producing beneficial bacterium Pseudomonas fluorescens G20-18 to enhance tomato growth and boost tolerance to drought stress. Tomato seedlings were root inoculated and their growth and physiological and molecular responses assessed under well-watered conditions and also in response to progressive drought stress and a subsequent recovery period. Root inoculation with G20-18 had a significant positive impact on tomato growth. Furthermore, G20-18 inoculated and drought-stressed plants showed higher leaf chlorophyll and abscisic acid (ABA) content and stomatal closure than non-inoculated controls. Root inoculation also increased the activity of different carbohydrate metabolism enzymes, which are important for root and leaf growth and development in drought stressed plants. A significant increase in the activity of different antioxidant enzymes and total antioxidant capacity correlated with elevated levels of relevant secondary metabolites, such as phenolics, anthocyanins and flavonoids. RNA sequencing revealed distinct qualitative and quantitative differences in gene regulation in response to G20-18. Notably, the number of genes differentially regulated in response to G20-18 was approximately sevenfold higher during drought stress, indicating that root inoculation with the bacteria primed the plants for a much stronger transcriptionally regulated systemic drought stress response. The regulated genes are related to phenylalanine metabolism and other key processes linked to plant growth, development and drought stress resilience. A role of the ability of G20-18 to produce the plant hormone cytokinin for interaction with tomato was established by the cytokinin-deficient biosynthesis mutants CNT1 and CNT2. In comparison with G20-18, the inoculation of plants with CNT1 resulted in a reduced number of differentially regulated genes. The relative change was most prominent under well-watered conditions with a 85 % reduction, corresponding to 462 genes. However, under drought conditions the absolute number of differentially regulated genes was reduced by even 2219 in response to the CNT1 mutant. The relevance of the ability of G20-18 to produce cytokinins for interaction with plants was also evident from differences in growth and specific cell and ecophysiological parameters in response to CNT1 and CNT2. These findings provide novel insights about G20-18's ability to improve drought stress responses and the role of interkingdom signalling by bacterial-derived cytokinins, and contribute to enhance the robustness of the practical application of these microorganisms to improve crop resilience in agricultural production.
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Affiliation(s)
- Mengistu F Mekureyaw
- University of Copenhagen, Department of Plant and Environmental Sciences, Section of Crop Science, Denmark; University of Copenhagen, Department of Plant and Environmental Sciences, Section of Microbial Ecology and Biotechnology, Denmark
| | - Chandana Pandey
- University of Copenhagen, Department of Plant and Environmental Sciences, Section of Crop Science, Denmark
| | - Rosanna C Hennessy
- University of Copenhagen, Department of Plant and Environmental Sciences, Section of Microbial Ecology and Biotechnology, Denmark
| | - Mette H Nicolaisen
- University of Copenhagen, Department of Plant and Environmental Sciences, Section of Microbial Ecology and Biotechnology, Denmark
| | - Fulai Liu
- University of Copenhagen, Department of Plant and Environmental Sciences, Section of Crop Science, Denmark
| | - Ole Nybroe
- University of Copenhagen, Department of Plant and Environmental Sciences, Section of Microbial Ecology and Biotechnology, Denmark
| | - Thomas Roitsch
- University of Copenhagen, Department of Plant and Environmental Sciences, Section of Crop Science, Denmark; Department of Adaptive Biotechnologies, Global Change Research Institute, Czech Academy of Sciences, Brno, Czech Republic.
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10
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De Rocchis V, Roitsch T, Franken P. Extracellular Glycolytic Activities in Root Endophytic Serendipitaceae and Their Regulation by Plant Sugars. Microorganisms 2022; 10:microorganisms10020320. [PMID: 35208775 PMCID: PMC8878002 DOI: 10.3390/microorganisms10020320] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 01/20/2022] [Accepted: 01/26/2022] [Indexed: 02/01/2023] Open
Abstract
Endophytic fungi that colonize the plant root live in an environment with relative high concentrations of different sugars. Analyses of genome sequences indicate that such endophytes can secrete carbohydrate-related enzymes to compete for these sugars with the surrounding plant cells. We hypothesized that typical plant sugars can be used as carbon source by root endophytes and that these sugars also serve as signals to induce the expression and secretion of glycolytic enzymes. The plant-growth-promoting endophytes Serendipita indica and Serendipita herbamans were selected to first determine which sugars promote their growth and biomass formation. Secondly, particular sugars were added to liquid cultures of the fungi to induce intracellular and extracellular enzymatic activities which were measured in mycelia and culture supernatants. The results showed that both fungi cannot feed on melibiose and lactose, but instead use glucose, fructose, sucrose, mannose, arabinose, galactose and xylose as carbohydrate sources. These sugars regulated the cytoplasmic activity of glycolytic enzymes and also their secretion. The levels of induction or repression depended on the type of sugars added to the cultures and differed between the two fungi. Since no conventional signal peptide could be detected in most of the genome sequences encoding the glycolytic enzymes, a non-conventional protein secretory pathway is assumed. The results of the study suggest that root endophytic fungi translocate glycolytic activities into the root, and this process is regulated by the availability of particular plant sugars.
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Affiliation(s)
- Vincenzo De Rocchis
- Leibniz Institute of Vegetable and Ornamental Crops, Theodor-Echtermeyer-Weg 1, 14979 Großbeeren, Germany
- Institute of Biology, Humboldt-Universität zu Berlin, Philippstrasse 13, 10115 Berlin, Germany
- Correspondence: (V.D.R.); (P.F.)
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, University of Copenhagen, 2630 Copenhagen, Denmark;
- Department of Adaptive Biotechnologies, Global Change Research Institute, Czech Academy of Sciences, 603 00 Brno, Czech Republic
| | - Philipp Franken
- Leibniz Institute of Vegetable and Ornamental Crops, Theodor-Echtermeyer-Weg 1, 14979 Großbeeren, Germany
- Institute of Biology, Humboldt-Universität zu Berlin, Philippstrasse 13, 10115 Berlin, Germany
- Correspondence: (V.D.R.); (P.F.)
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11
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Pandey C, Großkinsky DK, Westergaard JC, Jørgensen HJL, Svensgaard J, Christensen S, Schulz A, Roitsch T. Identification of a bio-signature for barley resistance against Pyrenophora teres infection based on physiological, molecular and sensor-based phenotyping. Plant Sci 2021; 313:111072. [PMID: 34763864 DOI: 10.1016/j.plantsci.2021.111072] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 09/19/2021] [Accepted: 09/25/2021] [Indexed: 06/13/2023]
Abstract
Necrotic and chlorotic symptoms induced during Pyrenophora teres infection in barley leaves indicate a compatible interaction that allows the hemi-biotrophic fungus Pyrenophora teres to colonise the host. However, it is unexplored how this fungus affects the physiological responses of resistant and susceptible cultivars during infection. To assess the degree of resistance in four different cultivars, we quantified visible symptoms and fungal DNA and performed expression analyses of genes involved in plant defence and ROS scavenging. To obtain insight into the interaction between fungus and host, we determined the activity of 19 key enzymes of carbohydrate and antioxidant metabolism. The pathogen impact was also phenotyped non-invasively by sensor-based multireflectance and -fluorescence imaging. Symptoms, regulation of stress-related genes and pathogen DNA content distinguished the cultivar Guld as being resistant. Severity of net blotch symptoms was also strongly correlated with the dynamics of enzyme activities already within the first day of infection. In contrast to the resistant cultivar, the three susceptible cultivars showed a higher reflectance over seven spectral bands and higher fluorescence intensities at specific excitation wavelengths. The combination of semi high-throughput physiological and molecular analyses with non-invasive phenotyping enabled the identification of bio-signatures that discriminates the resistant from susceptible cultivars.
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Affiliation(s)
- Chandana Pandey
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Denmark
| | - Dominik K Großkinsky
- AIT Austrian Institute of Technology GmbH, Center for Health and Bioresources, Bioresources Unit, Konrad-Lorenz-Straße 24, 3430, Tulln, Austria
| | - Jesper Cairo Westergaard
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Denmark
| | - Hans J L Jørgensen
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Denmark
| | - Jesper Svensgaard
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Denmark
| | - Svend Christensen
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Denmark
| | - Alexander Schulz
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Denmark.
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Denmark; Department of Adaptive Biotechnologies, Global Change Research Institute, CAS, Brno, Czechia
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12
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Correia PMP, da Silva AB, Roitsch T, Carmo-Silva E, Marques da Silva J. Photoprotection and optimization of sucrose usage contribute to faster recovery of photosynthesis after water deficit at high temperatures in wheat. Physiol Plant 2021; 172:615-628. [PMID: 33010044 DOI: 10.1111/ppl.13227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 09/22/2020] [Accepted: 09/29/2020] [Indexed: 06/11/2023]
Abstract
Plants are increasingly exposed to events of elevated temperature and water deficit, which threaten crop productivity. Understanding the ability to rapidly recover from abiotic stress, restoring carbon assimilation and biomass production, is important to unravel crop climate resilience. This study compared the photosynthetic performance of two Triticum aestivum L. cultivars, Sokoll and Paragon, adapted to the climate of Mexico and UK, respectively, exposed to 1-week water deficit and high temperatures, in isolation or combination. Measurements included photosynthetic assimilation rate, stomatal conductance, in vitro activities of Rubisco (EC 4.1.1.39) and invertase (INV, EC 3.2.1.26), antioxidant capacity and chlorophyll a fluorescence. In both genotypes, under elevated temperatures and water deficit (WD38°C), the photosynthetic limitations were mainly due to stomatal restrictions and to a decrease in the electron transport rate. Chlorophyll a fluorescence parameters clearly indicate differences between the two genotypes in the photoprotection when subjected to WD38°C and showed faster recovery of Paragon after stress relief. The activity of the cytosolic invertase (CytINV) under these stress conditions was strongly related to the fast photosynthesis recovery of Paragon. Taken together, the results suggest that optimal sucrose export/utilization and increased photoprotection of the electron transport machinery are important components to limit yield fluctuations due to water shortage and elevated temperatures.
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Affiliation(s)
- Pedro M P Correia
- BioISI-Biosystems and Integrative Sciences Institute, Faculdade de Ciências da Universidade de Lisboa, Lisbon, Portugal
- Lancaster Environment Centre, Lancaster University, Lancaster, UK
| | - Anabela B da Silva
- BioISI-Biosystems and Integrative Sciences Institute, Faculdade de Ciências da Universidade de Lisboa, Lisbon, Portugal
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Section of Crop Science, Copenhagen University, Copenhagen, Denmark
- Department of Adaptive Biotechnologies, Global Change Research Institute, CAS, Brno, Czech Republic
| | | | - Jorge Marques da Silva
- BioISI-Biosystems and Integrative Sciences Institute, Faculdade de Ciências da Universidade de Lisboa, Lisbon, Portugal
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13
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Shokat S, Novák O, Široká J, Singh S, Gill KS, Roitsch T, Großkinsky DK, Liu F. Elevated CO2 modulates the effect of heat stress responses in Triticum aestivum by differential expression of isoflavone reductase-like (IRL) gene. J Exp Bot 2021:erab247. [PMID: 34050754 DOI: 10.1093/jxb/erab247] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Indexed: 06/12/2023]
Abstract
Two wheat genotypes forming high and low biomass (HB and LB), exhibiting differential expression of an isoflavone reductase-like (IRL) gene, and resulting in contrasting grain yield under heat stress field conditions, were analyzed in detail for their responses under controlled heat and elevated CO2 conditions. Significant differences in IRL expression between the two lines were hypothesized to be the basis of their differential performance under the tested conditions and their stress tolerance potential. By a holistic approach integrating advanced cell physiological phenotyping of the antioxidative and phytohormone system in spikes and leaves with measurements of ecophysiological and agronomic traits, the genetic differences of the genotypes in IRL expression were assessed. In response to heat and elevated CO2, the two genotypes showed opposite regulation of IRL expression, which was associated with cytokinin concentration, total flavonoid contents, activity of superoxide dismutase, antioxidant capacity and photosynthetic rate in leaves and cytokinin concentration and ascorbate peroxidase activity in spikes. Our study showed that IRL expression is associated with wheat yield performance under heat stress at anthesis, mediated by diverse physiological mechanisms. Hence, based on our results, the IRL gene is a promising candidate for developing genetic markers for breeding heat-tolerant wheat.
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Affiliation(s)
- Sajid Shokat
- Crop science, Department of Plant and Environmental Sciences, University of Copenhagen, Højbakkegård Allé, Taastrup, Denmark
- Wheat Breeding Group, Plant Breeding and Genetics Division, Nuclear Institute for Agriculture and Biology, Faisalabad, Pakistan
| | - Ondřej Novák
- Laboratory of Growth Regulators, Faculty of Science, Palacký University and Institute of Experimental Botany, The Czech Academy of Sciences, Olomouc, Czech Republic
| | - Jitka Široká
- Laboratory of Growth Regulators, Faculty of Science, Palacký University and Institute of Experimental Botany, The Czech Academy of Sciences, Olomouc, Czech Republic
| | | | - Kulvinder Singh Gill
- Geneshifters, Mary Jena Lane, Pullman WA, USA
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
| | - Thomas Roitsch
- Crop science, Department of Plant and Environmental Sciences, University of Copenhagen, Højbakkegård Allé, Taastrup, Denmark
- Department of Adaptive Biotechnologies, Global Change Research Institute, CAS, Brno, Czech Republic
| | - Dominik K Großkinsky
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, Thorvaldsensvej, Frederiksberg C, Denmark
- AIT Austrian Institute of Technology GmbH, Center for Health and Bioresources, Bioresources Unit, Konrad-Lorenz-Straße, Tulln, Austria
| | - Fulai Liu
- Crop science, Department of Plant and Environmental Sciences, University of Copenhagen, Højbakkegård Allé, Taastrup, Denmark
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14
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Škrlj B, Novak MP, Brader G, Anžič B, Ramšak Ž, Gruden K, Kralj J, Kladnik A, Lavrač N, Roitsch T, Dermastia M. New Cross-Talks between Pathways Involved in Grapevine Infection with ' Candidatus Phytoplasma solani' Revealed by Temporal Network Modelling. Plants (Basel) 2021; 10:plants10040646. [PMID: 33805409 PMCID: PMC8065506 DOI: 10.3390/plants10040646] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/18/2021] [Accepted: 03/24/2021] [Indexed: 12/17/2022]
Abstract
Understanding temporal biological phenomena is a challenging task that can be approached using network analysis. Here, we explored whether network reconstruction can be used to better understand the temporal dynamics of bois noir, which is associated with ‘Candidatus Phytoplasma solani’, and is one of the most widespread phytoplasma diseases of grapevine in Europe. We proposed a methodology that explores the temporal network dynamics at the community level, i.e., densely connected subnetworks. The methodology offers both insights into the functional dynamics via enrichment analysis at the community level, and analyses of the community dissipation, as a measure that accounts for community degradation. We validated this methodology with cases on experimental temporal expression data of uninfected grapevines and grapevines infected with ‘Ca. P. solani’. These data confirm some known gene communities involved in this infection. They also reveal several new gene communities and their potential regulatory networks that have not been linked to ‘Ca. P. solani’ to date. To confirm the capabilities of the proposed method, selected predictions were empirically evaluated.
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Affiliation(s)
- Blaž Škrlj
- Jožef Stefan International Postgraduate School, 1000 Ljubljana, Slovenia;
- Jožef Stefan Institute, 1000 Ljubljana, Slovenia;
- Correspondence:
| | - Maruša Pompe Novak
- National Institute of Biology, 1000 Ljubljana, Slovenia; (M.P.N.); (B.A.); (Ž.R.); (K.G.); (M.D.)
- School of Viticulture and Enology, University of Nova Gorica, 5271 Vipava, Slovenia
| | - Günter Brader
- Austrian Institute of Technology, Bioresources Unit, 3430 Tulln, Austria;
| | - Barbara Anžič
- National Institute of Biology, 1000 Ljubljana, Slovenia; (M.P.N.); (B.A.); (Ž.R.); (K.G.); (M.D.)
| | - Živa Ramšak
- National Institute of Biology, 1000 Ljubljana, Slovenia; (M.P.N.); (B.A.); (Ž.R.); (K.G.); (M.D.)
| | - Kristina Gruden
- National Institute of Biology, 1000 Ljubljana, Slovenia; (M.P.N.); (B.A.); (Ž.R.); (K.G.); (M.D.)
| | - Jan Kralj
- Jožef Stefan Institute, 1000 Ljubljana, Slovenia;
| | - Aleš Kladnik
- Department of Biology, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia;
| | - Nada Lavrač
- Jožef Stefan International Postgraduate School, 1000 Ljubljana, Slovenia;
- Jožef Stefan Institute, 1000 Ljubljana, Slovenia;
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, University of Copenhagen, 2630 Taastrup, Denmark;
| | - Marina Dermastia
- National Institute of Biology, 1000 Ljubljana, Slovenia; (M.P.N.); (B.A.); (Ž.R.); (K.G.); (M.D.)
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15
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Garcia-Lemos AM, Großkinsky DK, Saleem Akhtar S, Nicolaisen MH, Roitsch T, Nybroe O, Veierskov B. Identification of Root-Associated Bacteria That Influence Plant Physiology, Increase Seed Germination, or Promote Growth of the Christmas Tree Species Abies nordmanniana. Front Microbiol 2020; 11:566613. [PMID: 33281762 PMCID: PMC7705201 DOI: 10.3389/fmicb.2020.566613] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 10/27/2020] [Indexed: 12/03/2022] Open
Abstract
Abies nordmanniana is used for Christmas tree production but poor seed germination and slow growth represent challenges for the growers. We addressed the plant growth promoting potential of root-associated bacteria isolated from A. nordmanniana. Laboratory screenings of a bacterial strain collection yielded several Bacillus and Paenibacillus strains that improved seed germination and produced indole-3-acetic acid. The impact of three of these strains on seed germination, plant growth and growth-related physiological parameters was then determined in greenhouse and field trials after seed inoculation, and their persistence was assessed by 16S rRNA gene-targeted bacterial community analysis. Two strains showed distinct and significant effects. Bacillus sp. s50 enhanced seed germination in the greenhouse but did not promote shoot or root growth. In accordance, this strain did not increase the level of soluble hexoses needed for plant growth but increased the level of storage carbohydrates. Moreover, strain s50 increased glutathione reductase and glutathione-S-transferase activities in the plant, which may indicate induction of systemic resistance during the early phase of plant development, as the strain showed poor persistence in the root samples (rhizosphere soil plus root tissue). Paenibacillus sp. s37 increased plant root growth, especially by inducing secondary root formation, under in greenhouse conditions, where it showed high persistence in the root samples. Under these conditions, it further it increased the level of soluble carbohydrates in shoots, and the levels of starch and non-structural carbohydrates in roots, stem and shoots. Moreover, it increased the chlorophyll level in the field trial. These findings indicate that this strain improves plant growth and vigor through effects on photosynthesis and plant carbohydrate reservoirs. The current results show that the two strains s37 and s50 could be considered for growth promotion programs of A. nordmanniana in greenhouse nurseries, and even under field conditions.
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Affiliation(s)
- Adriana M Garcia-Lemos
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Dominik K Großkinsky
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark.,Bioresources Unit, Center for Health and Bioresources, AIT Austrian Institute of Technology GmbH, Tulln an der Donau, Austria
| | - Saqib Saleem Akhtar
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Mette Haubjerg Nicolaisen
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark.,Department of Adaptive Biotechnologies, Global Change Research Institute, Brno, Czechia
| | - Ole Nybroe
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Bjarke Veierskov
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
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16
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Shokat S, Großkinsky DK, Roitsch T, Liu F. Activities of leaf and spike carbohydrate-metabolic and antioxidant enzymes are linked with yield performance in three spring wheat genotypes grown under well-watered and drought conditions. BMC Plant Biol 2020; 20:400. [PMID: 32867688 PMCID: PMC7457523 DOI: 10.1186/s12870-020-02581-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 07/27/2020] [Indexed: 05/08/2023]
Abstract
BACKGROUND To improve our understanding about the physiological mechanism of grain yield reduction at anthesis, three spring wheat genotypes [L1 (advanced line), L2 (Vorobey) and L3 (Punjab-11)] having contrasting yield potential under drought in field were investigated under controlled greenhouse conditions, drought stress was imposed at anthesis stage by withholding irrigation until all plant available water was depleted, while well-watered control plants were kept at 95% pot water holding capacity. RESULTS Compared to genotype L1 and L2, pronounced decrease in grain number (NGS), grain yield (GY) and harvest index (HI) were found in genotype L3, mainly due to its greater kernel abortion (KA) under drought. A significant positive correlation of leaf monodehydroascorbate reductase (MDHAR) with both NGS and HI was observed. In contrast, significant negative correlations of glutathione S-transferase (GST) and vacuolar invertase (vacInv) both within source and sink were found with NGS and HI. Likewise, a significant negative correlation of leaf abscisic acid (ABA) with NGS was noticed. Moreover, leaf aldolase and cell wall peroxidase (cwPOX) activities were significantly and positively associated with thousand kernel weight (TKW). CONCLUSION Distinct physiological markers correlating with yield traits and higher activity of leaf aldolase and cwPOX may be chosen as predictive biomarkers for higher TKW. Also, higher activity of MDHAR within the leaf can be selected as a predictive biomarker for higher NGS in wheat under drought. Whereas, lower activity of vacInv and GST both within leaf and spike can be selected as biomarkers for higher NGS and HI. The results highlighted the role of antioxidant and carbohydrate-metabolic enzymes in the modulation of source-sink balance in wheat crops, which could be used as bio-signatures for breeding and selection of drought-resilient wheat genotypes for a future drier climate.
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Affiliation(s)
- Sajid Shokat
- Crop Science, Department of Plant and Environmental Sciences, University of Copenhagen, Højbakkegård Allé 13, 2630, Taastrup, Denmark.
- Wheat Breeding Group, Plant Breeding and Genetic Division, Nuclear Institute for Agriculture and Biology, Faisalabad, 38000, Pakistan.
| | - Dominik K Großkinsky
- Transport Biology, Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark
- AIT Austrian Institute of Technology GmbH, Center for Health and Bioresources, Bioresources Unit, Konrad-Lorenz-Straße 24, 3430, Tulln, Austria
| | - Thomas Roitsch
- Crop Science, Department of Plant and Environmental Sciences, University of Copenhagen, Højbakkegård Allé 13, 2630, Taastrup, Denmark
| | - Fulai Liu
- Crop Science, Department of Plant and Environmental Sciences, University of Copenhagen, Højbakkegård Allé 13, 2630, Taastrup, Denmark
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17
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Yang A, Akhtar SS, Fu Q, Naveed M, Iqbal S, Roitsch T, Jacobsen SE. Burkholderia Phytofirmans PsJN Stimulate Growth and Yield of Quinoa under Salinity Stress. Plants (Basel) 2020; 9:plants9060672. [PMID: 32466435 PMCID: PMC7355930 DOI: 10.3390/plants9060672] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 05/16/2020] [Accepted: 05/18/2020] [Indexed: 12/17/2022]
Abstract
One of the major challenges in agriculture is to ensure sufficient and healthy food availability for the increasing world population in near future. This requires maintaining sustainable cultivation of crop plants under varying environmental stresses. Among these stresses, salinity is the second most abundant threat worldwide after drought. One of the promising strategies to mitigate salinity stress is to cultivate halotolerant crops such as quinoa. Under high salinity, performance can be improved by plant growth promoting bacteria (PGPB). Among PGPB, endophytic bacteria are considered better in stimulating plant growth compared to rhizosphere bacteria because of their ability to colonize both in plant rhizosphere and plant interior. Therefore, in the current study, a pot experiment was conducted in a controlled greenhouse to investigate the effects of endophytic bacteria i.e., Burkholderia phytofirmans PsJN on improving growth, physiology and yield of quinoa under salinity stress. At six leaves stage, plants were irrigated with saline water having either 0 (control) or 400 mM NaCl. The results indicated that plants inoculated with PsJN mitigated the negative effects of salinity on quinoa resulting in increased shoot biomass, grain weight and grain yield by 12%, 18% and 41% respectively, over un-inoculated control. Moreover, inoculation with PsJN improved osmotic adjustment and ion homeostasis ability. In addition, leaves were also characterized for five key reactive oxygen species (ROS) scavenging enzyme in response to PsJN treatment. This showed higher activity of catalase (CAT) and dehydroascobate reductase (DHAR) in PsJN-treated plants. These findings suggest that inoculation of quinoa seeds with Burkholderia phytofirmans PsJN could be used for stimulating growth and yield of quinoa in highly salt-affected soils.
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Affiliation(s)
- Aizheng Yang
- School of Water Conservancy and Civil Engineering, Northeast Agriculture University, Harbin 150030, China;
| | - Saqib Saleem Akhtar
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Højbakkegård Allé 13, DK-2630 Tåstrup, Denmark; (S.S.A.); (T.R.)
- Dansk Agro Aps, Snubbekorsvej 20 C, DK-2630 Tåstrup, Denmark
| | - Qiang Fu
- School of Water Conservancy and Civil Engineering, Northeast Agriculture University, Harbin 150030, China;
- Correspondence: (Q.F.); (S.-E.J.)
| | - Muhammad Naveed
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan;
| | - Shahid Iqbal
- Department of Agronomy, Muhammad Nawaz Shareef University of Agriculture, Multan 66000, Pakistan;
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Højbakkegård Allé 13, DK-2630 Tåstrup, Denmark; (S.S.A.); (T.R.)
- Department of Adaptive Biotechnologies, Global Change Research Institute, CAS, 603 00 Brno, Czech Republic
| | - Sven-Erik Jacobsen
- Quinoa Quality ApS, DK-4420 Regstrup, Denmark
- Correspondence: (Q.F.); (S.-E.J.)
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18
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Akhtar SS, Amby DB, Hegelund JN, Fimognari L, Großkinsky DK, Westergaard JC, Müller R, Moelbak L, Liu F, Roitsch T. Bacillus licheniformis FMCH001 Increases Water Use Efficiency via Growth Stimulation in Both Normal and Drought Conditions. Front Plant Sci 2020; 11:297. [PMID: 32318078 PMCID: PMC7155768 DOI: 10.3389/fpls.2020.00297] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 02/27/2020] [Indexed: 05/21/2023]
Abstract
Increasing agricultural losses due to biotic and abiotic stresses caused by climate change challenge food security worldwide. A promising strategy to sustain crop productivity under conditions of limited water availability is the use of plant growth promoting rhizobacteria (PGPR). Here, the effects of spore forming Bacillus licheniformis (FMCH001) on growth and physiology of maize (Zea mays L. cv. Ronaldinho) under well-watered and drought stressed conditions were investigated. Pot experiments were conducted in the automated high-throughput phenotyping platform PhenoLab and under greenhouse conditions. Results of the PhenoLab experiments showed that plants inoculated with B. licheniformis FMCH001 exhibited increased root dry weight (DW) and plant water use efficiency (WUE) compared to uninoculated plants. In greenhouse experiments, root and shoot DW significantly increased by more than 15% in inoculated plants compared to uninoculated control plants. Also, the WUE increased in FMCH001 plants up to 46% in both well-watered and drought stressed plants. Root and shoot activities of 11 carbohydrate and eight antioxidative enzymes were characterized in response to FMCH001 treatments. This showed a higher antioxidant activity of catalase (CAT) in roots of FMCH001 treated plants compared to uninoculated plants. The higher CAT activity was observed irrespective of the water regime. These findings show that seed coating with Gram positive spore forming B. licheniformis could be used as biostimulants for enhancing plant WUE under both normal and drought stress conditions.
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Affiliation(s)
- Saqib Saleem Akhtar
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Taastrup, Denmark
| | - Daniel Buchvaldt Amby
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Taastrup, Denmark
| | - Josefine Nymark Hegelund
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Taastrup, Denmark
| | | | - Dominik K. Großkinsky
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Taastrup, Denmark
| | - Jesper Cairo Westergaard
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Taastrup, Denmark
| | - Renate Müller
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Taastrup, Denmark
| | - Lars Moelbak
- Plant Health Innovation, Chr-Hansen A/S, Hørsholm, Denmark
| | - Fulai Liu
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Taastrup, Denmark
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Taastrup, Denmark
- Department of Adaptive Biotechnologies, Global Change Research Institute, Czech Academy of Sciences, Brno, Czechia
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19
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Garcia-Lemos AM, Gobbi A, Nicolaisen MH, Hansen LH, Roitsch T, Veierskov B, Nybroe O. Under the Christmas Tree: Belowground Bacterial Associations With Abies nordmanniana Across Production Systems and Plant Development. Front Microbiol 2020; 11:198. [PMID: 32194515 PMCID: PMC7064441 DOI: 10.3389/fmicb.2020.00198] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 01/28/2020] [Indexed: 01/01/2023] Open
Abstract
Abies nordmanniana is an economically important tree crop widely used for Christmas tree production. After initial growth in nurseries, seedlings are transplanted to the field. Rhizosphere bacterial communities generally impact the growth and health of the host plant. However, the dynamics of these communities during A. nordmanniana growth in nurseries, and during transplanting, has not previously been addressed. By a 16S rRNA gene amplicon sequencing approach, we characterized the composition and dynamics of bacterial communities in the rhizosphere during early plant growth in field and greenhouse nurseries and for plants transplanted from the greenhouse to the field. Moreover, the N-cycling potential of rhizosphere bacteria across plant age was addressed in both nurseries. Overall, a rhizosphere core microbiome of A. nordmanniana, comprising 19.9% of the taxa at genus level, was maintained across plant age, nursery production systems, and even during the transplantation of plants from the greenhouse to the field. The core microbiome included the bacterial genera Bradyrhizobium, Burkholderia, Flavobacterium, Pseudomonas, Rhizobium, Rhodanobacter, and Sphingomonas, which harbor several N-fixing and plant growth–promoting taxa. Nevertheless, both plant age and production system caused significant changes in the rhizosphere bacterial communities. Concerning community composition, the relative abundance of Rhizobiales (genera Rhizobium, Bradyrhizobium, and Devosia) was higher in the rhizosphere of field-grown A. nordmanniana, whereas the relative abundance of Enterobacteriales and Pseudomonadales (genus Pseudomonas) was higher in the greenhouse. Analysis of community dynamics across plant age showed that in the field nursery, the most abundant bacterial orders showed more dynamic changes in their relative abundance in the rhizosphere than in the bulk soil. In the greenhouse, age-dependent dynamics even occurred but affected different taxa than for the field-grown plants. The N-cycling potential of rhizosphere bacterial communities showed an increase of the relative abundance of genes involved in nitrogen fixation and denitrification by plant age. Similarly, the relative abundance of reported nitrogen-fixing or denitrifying bacteria increased by plant age. However, different community structures seemed to lead to an increased potential for nitrogen fixation and denitrification in the field versus greenhouse nurseries.
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Affiliation(s)
- Adriana M Garcia-Lemos
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Alex Gobbi
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Mette Haubjerg Nicolaisen
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Lars H Hansen
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark.,Department of Adaptive Biotechnologies, Global Change Research Institute, CAS, Brno, Czechia
| | - Bjarke Veierskov
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Ole Nybroe
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
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20
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Akhtar SS, Mekureyaw MF, Pandey C, Roitsch T. Role of Cytokinins for Interactions of Plants With Microbial Pathogens and Pest Insects. Front Plant Sci 2020; 10:1777. [PMID: 32140160 PMCID: PMC7042306 DOI: 10.3389/fpls.2019.01777] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Accepted: 12/19/2019] [Indexed: 05/05/2023]
Abstract
It has been recognized that cytokinins are plant hormones that influence not only numerous aspects of plant growth, development and physiology, including cell division, chloroplast differentiation and delay of senescence but the interaction with other organisms, including pathogens. Cytokinins are not only produced by plants but are also by other prokaryotic and eukaryotic organism such as bacteria, fungi, microalgae and insects. Notably, cytokinins are produced both by pathogenic and also beneficial microbes and are known to induce resistance in plants against pathogen infections. In this review the contrasting role of cytokinin for the defence and susceptibility of plants against bacterial and fungal pathogen and pest insects is assessed. We also discuss the cross talk of cytokinins with other phytohormones and the underlying mechanism involved in enhancing plant immunity against pathogen infections and explore possible practical applications in crop plant production.
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Affiliation(s)
- Saqib Saleem Akhtar
- Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Mengistu F. Mekureyaw
- Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Chandana Pandey
- Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Adaptive Biotechnologies, Global Change Research Institute, CAS, Brno, Czechia
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21
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Garcia-Lemos AM, Großkinsky DK, Saleem Akhtar S, Nicolaisen MH, Roitsch T, Nybroe O, Veierskov B. Identification of Root-Associated Bacteria That Influence Plant Physiology, Increase Seed Germination, or Promote Growth of the Christmas Tree Species Abies nordmanniana. Front Microbiol 2020. [PMID: 33281762 DOI: 10.3389/fmicb.2020.566613)] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023] Open
Abstract
Abies nordmanniana is used for Christmas tree production but poor seed germination and slow growth represent challenges for the growers. We addressed the plant growth promoting potential of root-associated bacteria isolated from A. nordmanniana. Laboratory screenings of a bacterial strain collection yielded several Bacillus and Paenibacillus strains that improved seed germination and produced indole-3-acetic acid. The impact of three of these strains on seed germination, plant growth and growth-related physiological parameters was then determined in greenhouse and field trials after seed inoculation, and their persistence was assessed by 16S rRNA gene-targeted bacterial community analysis. Two strains showed distinct and significant effects. Bacillus sp. s50 enhanced seed germination in the greenhouse but did not promote shoot or root growth. In accordance, this strain did not increase the level of soluble hexoses needed for plant growth but increased the level of storage carbohydrates. Moreover, strain s50 increased glutathione reductase and glutathione-S-transferase activities in the plant, which may indicate induction of systemic resistance during the early phase of plant development, as the strain showed poor persistence in the root samples (rhizosphere soil plus root tissue). Paenibacillus sp. s37 increased plant root growth, especially by inducing secondary root formation, under in greenhouse conditions, where it showed high persistence in the root samples. Under these conditions, it further it increased the level of soluble carbohydrates in shoots, and the levels of starch and non-structural carbohydrates in roots, stem and shoots. Moreover, it increased the chlorophyll level in the field trial. These findings indicate that this strain improves plant growth and vigor through effects on photosynthesis and plant carbohydrate reservoirs. The current results show that the two strains s37 and s50 could be considered for growth promotion programs of A. nordmanniana in greenhouse nurseries, and even under field conditions.
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Affiliation(s)
- Adriana M Garcia-Lemos
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Dominik K Großkinsky
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
- Bioresources Unit, Center for Health and Bioresources, AIT Austrian Institute of Technology GmbH, Tulln an der Donau, Austria
| | - Saqib Saleem Akhtar
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Mette Haubjerg Nicolaisen
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
- Department of Adaptive Biotechnologies, Global Change Research Institute, Brno, Czechia
| | - Ole Nybroe
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
| | - Bjarke Veierskov
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark
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22
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Fimognari L, Dölker R, Kaselyte G, Jensen CNG, Akhtar SS, Großkinsky DK, Roitsch T. Simple semi-high throughput determination of activity signatures of key antioxidant enzymes for physiological phenotyping. Plant Methods 2020; 16:42. [PMID: 32206082 PMCID: PMC7085164 DOI: 10.1186/s13007-020-00583-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 03/10/2020] [Indexed: 05/02/2023]
Abstract
BACKGROUND Reactive oxygen species (ROS) such as hydrogen peroxide and superoxide anions significantly accumulate during biotic and abiotic stress and cause oxidative damage and eventually cell death. There is accumulating evidence that ROS are also involved in regulating beneficial plant-microbe interactions, signal transduction and plant growth and development. Due to the relevance of ROS throughout the life cycle and for interaction with the multifactorial environment, the physiological phenotyping of the mechanisms controlling ROS homeostasis is of general importance. RESULTS In this study, we have developed a robust and resource-efficient experimental platform that allows the determination of the activities of the nine key ROS scavenging enzymes from a single extraction that integrates posttranscriptional and posttranslational regulations. The assays were optimized and adapted for a semi-high throughput 96-well assay format. In a case study, we have analyzed tobacco leaves challenged by pathogen infection, drought and salt stress. The three stress factors resulted in distinct activity signatures with differential temporal dynamics. CONCLUSIONS This experimental platform proved to be suitable to determine the antioxidant enzyme activity signature in different tissues of monocotyledonous and dicotyledonous model and crop plants. The universal enzymatic extraction procedure combined with the 96-well assay format demonstrated to be a simple, fast and semi-high throughput experimental platform for the precise and robust fingerprinting of nine key antioxidant enzymatic activities in plants.
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Affiliation(s)
- Lorenzo Fimognari
- Chr-Hansen A/S, Plant Health Innovation, Bøge Allé 10-12, 2970 Hørsholm, Denmark
| | - Rebecca Dölker
- Department of Plant and Environmental Sciences, Section of Crop Science, Copenhagen University, Højbakkegård Allé 13, 2630 Tåstrup, Denmark
| | - Greta Kaselyte
- Department of Plant and Environmental Sciences, Section of Crop Science, Copenhagen University, Højbakkegård Allé 13, 2630 Tåstrup, Denmark
| | - Camilla N. G. Jensen
- Department of Plant and Environmental Sciences, Section of Crop Science, Copenhagen University, Højbakkegård Allé 13, 2630 Tåstrup, Denmark
| | - Saqib S. Akhtar
- Department of Plant and Environmental Sciences, Section of Crop Science, Copenhagen University, Højbakkegård Allé 13, 2630 Tåstrup, Denmark
| | - Dominik K. Großkinsky
- Department of Plant and Environmental Sciences, Section of Crop Science, Copenhagen University, Højbakkegård Allé 13, 2630 Tåstrup, Denmark
- Department of Plant and Environmental Sciences, Section for Transport Biology and Copenhagen Plant Science Centre, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Section of Crop Science, Copenhagen University, Højbakkegård Allé 13, 2630 Tåstrup, Denmark
- Department of Adaptive Biotechnologies, Global Change Research Institute, CAS, Brno, Czech Republic
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23
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Geiger J, Doelker R, Salö S, Roitsch T, Dalgaard LT. Physiological phenotyping of mammalian cell lines by enzymatic activity fingerprinting of key carbohydrate metabolic enzymes: a pilot and feasibility study. BMC Res Notes 2019; 12:682. [PMID: 31640766 PMCID: PMC6805439 DOI: 10.1186/s13104-019-4697-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 10/03/2019] [Indexed: 11/16/2022] Open
Abstract
Objective Enzymatic fingerprinting of key enzymes of glucose metabolism is a valuable analysis tool in cell physiological phenotyping of plant samples. Yet, a similar approach for mammalian cell line samples is missing. In this study, we applied semi-high throughput enzyme activity assays that were originally designed for plant samples and tested their feasibility in extracts of six frequently used mammalian cell lines (Caco2, HaCaT, C2C12, HEK293, HepG2 and INS-1E). Results Enzyme activities for aldolase, hexokinase, glucose-6-phosphate dehydrogenase, phosphoglucoisomerase, phosphoglucomutase, phosphofructokinase could be detected in samples of one or more mammalian cell lines. We characterized effects of sample dilution, assay temperature and repeated freeze–thaw cycles causing potential biases. After careful selection of experimental parameters, the presented semi-high throughput methods could be established as useful tool for physiological phenotyping of cultured mammalian cells.
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Affiliation(s)
- Julian Geiger
- Department of Science and Environment, Roskilde University, Universitetsvej 1, 4000, Roskilde, Denmark
| | - Rebecca Doelker
- Section for Crop Sciences, Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegårds Allé 13, 2630, Taastrup, Denmark
| | - Sofia Salö
- Department of Science and Environment, Roskilde University, Universitetsvej 1, 4000, Roskilde, Denmark
| | - Thomas Roitsch
- Section for Crop Sciences, Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegårds Allé 13, 2630, Taastrup, Denmark.,Global Change Research Institute CAS, Drásov, Czech Republic
| | - Louise T Dalgaard
- Department of Science and Environment, Roskilde University, Universitetsvej 1, 4000, Roskilde, Denmark.
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24
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Hupp S, Rosenkranz M, Bonfig K, Pandey C, Roitsch T. Noninvasive Phenotyping of Plant-Pathogen Interaction: Consecutive In Situ Imaging of Fluorescing Pseudomonas syringae, Plant Phenolic Fluorescence, and Chlorophyll Fluorescence in Arabidopsis Leaves. Front Plant Sci 2019; 10:1239. [PMID: 31681362 PMCID: PMC6803544 DOI: 10.3389/fpls.2019.01239] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Accepted: 09/05/2019] [Indexed: 05/26/2023]
Abstract
Plant-pathogen interactions have been widely studied, but mostly from the site of the plant secondary defense. Less is known about the effects of pathogen infection on plant primary metabolism. The possibility to transform a fluorescing protein into prokaryotes is a promising phenotyping tool to follow a bacterial infection in plants in a noninvasive manner. In the present study, virulent and avirulent Pseudomonas syringae strains were transformed with green fluorescent protein (GFP) to follow the spread of bacteria in vivo by imaging Pulse-Amplitude-Modulation (PAM) fluorescence and conventional binocular microscopy. The combination of various wavelengths and filters allowed simultaneous detection of GFP-transformed bacteria, PAM chlorophyll fluorescence, and phenolic fluorescence from pathogen-infected plant leaves. The results show that fluorescence imaging allows spatiotemporal monitoring of pathogen spread as well as phenolic and chlorophyll fluorescence in situ, thus providing a novel means to study complex plant-pathogen interactions and relate the responses of primary and secondary metabolism to pathogen spread and multiplication. The study establishes a deeper understanding of imaging data and their implementation into disease screening.
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Affiliation(s)
- Sabrina Hupp
- Department of Pharmaceutical Biology, University of Würzburg, Würzburg, Germany
| | - Maaria Rosenkranz
- Department of Pharmaceutical Biology, University of Würzburg, Würzburg, Germany
- Department of Environmental Sciences, Institute of Biochemical Plant Pathology, Research Unit Environmental Simulation, Helmholtz Zentrum Muenchen, Neuherberg, Germany
| | - Katharina Bonfig
- Department of Pharmaceutical Biology, University of Würzburg, Würzburg, Germany
| | - Chandana Pandey
- Department of Plant and Environmental Sciences, Section of Crop Science, University of Copenhagen, Copenhagen, Denmark
| | - Thomas Roitsch
- Department of Pharmaceutical Biology, University of Würzburg, Würzburg, Germany
- Department of Plant and Environmental Sciences, Section of Crop Science, University of Copenhagen, Copenhagen, Denmark
- Department of Adaptive Biotechnologies, Global Change Research Institute, CAS, Brno, Czechia
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25
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Roitsch T, Cabrera-Bosquet L, Fournier A, Ghamkhar K, Jiménez-Berni J, Pinto F, Ober ES. Review: New sensors and data-driven approaches-A path to next generation phenomics. Plant Sci 2019; 282:2-10. [PMID: 31003608 PMCID: PMC6483971 DOI: 10.1016/j.plantsci.2019.01.011] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/15/2018] [Accepted: 01/09/2019] [Indexed: 05/19/2023]
Abstract
At the 4th International Plant Phenotyping Symposium meeting of the International Plant Phenotyping Network (IPPN) in 2016 at CIMMYT in Mexico, a workshop was convened to consider ways forward with sensors for phenotyping. The increasing number of field applications provides new challenges and requires specialised solutions. There are many traits vital to plant growth and development that demand phenotyping approaches that are still at early stages of development or elude current capabilities. Further, there is growing interest in low-cost sensor solutions, and mobile platforms that can be transported to the experiments, rather than the experiment coming to the platform. Various types of sensors are required to address diverse needs with respect to targets, precision and ease of operation and readout. Converting data into knowledge, and ensuring that those data (and the appropriate metadata) are stored in such a way that they will be sensible and available to others now and for future analysis is also vital. Here we are proposing mechanisms for "next generation phenomics" based on our learning in the past decade, current practice and discussions at the IPPN Symposium, to encourage further thinking and collaboration by plant scientists, physicists and engineering experts.
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Affiliation(s)
- Thomas Roitsch
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark; Department of Adaptive Biotechnologies, Global Change Research Institute, CAS, Brno, Czech Republic
| | | | - Antoine Fournier
- Arvalis, Institut du végétal, 45, voie Romaine 41240 Beauce la Romaine, France
| | - Kioumars Ghamkhar
- Forage Science, Grasslands Research Centre, AgResearch, Tennent Drive, Fitzherbert, Palmerston North 4410, New Zealand
| | - José Jiménez-Berni
- Instituto de Agricultura Sostenible, Consejo Superior de Investigaciones Cientificas (CSIC) Avenida Menéndez Pidal, Campus Alameda del Obispo, 14004 Córdoba, Spain
| | - Francisco Pinto
- Global Wheat Program, International Maize and Wheat Improvement Center (CIMMYT), El Batán, Texcoco, México C.P. 56237, Mexico
| | - Eric S Ober
- National Institute of Agricultural Botany (NIAB), Huntingdon Road, Cambridge, CB3 0LE, UK.
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26
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Demina IV, Maity PJ, Nagchowdhury A, Ng JLP, van der Graaff E, Demchenko KN, Roitsch T, Mathesius U, Pawlowski K. Accumulation of and Response to Auxins in Roots and Nodules of the Actinorhizal Plant Datisca glomerata Compared to the Model Legume Medicago truncatula. Front Plant Sci 2019; 10:1085. [PMID: 31608077 PMCID: PMC6773980 DOI: 10.3389/fpls.2019.01085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 08/09/2019] [Indexed: 05/13/2023]
Abstract
Actinorhizal nodules are structurally different from legume nodules and show a greater similarity to lateral roots. Because of the important role of auxins in lateral root and nodule formation, auxin profiles were examined in roots and nodules of the actinorhizal species Datisca glomerata and the model legume Medicago truncatula. The auxin response in roots and nodules of both species was analyzed in transgenic root systems expressing a beta-glucuronidase gene under control of the synthetic auxin-responsive promoter DR5. The effects of two different auxin on root development were compared for both species. The auxin present in nodules at the highest levels was phenylacetic acid (PAA). No differences were found between the concentrations of active auxins of roots vs. nodules, while levels of the auxin conjugate indole-3-acetic acid-alanine were increased in nodules compared to roots of both species. Because auxins typically act in concert with cytokinins, cytokinins were also quantified. Concentrations of cis-zeatin and some glycosylated cytokinins were dramatically increased in nodules compared to roots of D. glomerata, but not of M. truncatula. The ratio of active auxins to cytokinins remained similar in nodules compared to roots in both species. The auxin response, as shown by the activation of the DR5 promoter, seemed significantly reduced in nodules compared to roots of both species, suggesting the accumulation of auxins in cell types that do not express the signal transduction pathway leading to DR5 activation. Effects on root development were analyzed for the synthetic auxin naphthaleneacetic acid (NAA) and PAA, the dominant auxin in nodules. Both auxins had similar effects, except that the sensitivity of roots to PAA was lower than to NAA. However, while the effects of both auxins on primary root growth were similar for both species, effects on root branching were different: both auxins had the classical positive effect on root branching in M. truncatula, but a negative effect in D. glomerata. Such a negative effect of exogenous auxin on root branching has previously been found for a cucurbit that forms lateral root primordia in the meristem of the parental root; however, root branching in D. glomerata does not follow that pattern.
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Affiliation(s)
- Irina V. Demina
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - Pooja Jha Maity
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - Anurupa Nagchowdhury
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - Jason L. P. Ng
- Division of Plant Science, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Eric van der Graaff
- Department of Plant Physiology, Karl-Franzens-Universität Graz, Graz, Austria
| | - Kirill N. Demchenko
- Laboratory of Cellular and Molecular Mechanisms of Plant Development, Komarov Botanical Institute, Russian Academy of Sciences, Saint-Petersburg, Russia
- Laboratory of Molecular and Cellular Biology, All-Russia Research Institute for Agricultural Microbiology, Saint-Petersburg, Russia
| | - Thomas Roitsch
- Department of Plant Physiology, Karl-Franzens-Universität Graz, Graz, Austria
| | - Ulrike Mathesius
- Division of Plant Science, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Katharina Pawlowski
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
- *Correspondence: Katharina Pawlowski,
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27
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Chawade A, Armoniené R, Berg G, Brazauskas G, Frostgård G, Geleta M, Gorash A, Henriksson T, Himanen K, Ingver A, Johansson E, Jørgensen LN, Koppel M, Koppel R, Makela P, Ortiz R, Podyma W, Roitsch T, Ronis A, Svensson JT, Vallenback P, Weih M. A transnational and holistic breeding approach is needed for sustainable wheat production in the Baltic Sea region. Physiol Plant 2018. [PMID: 29536550 DOI: 10.1111/ppl.12726] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The Baltic Sea is one of the largest brackish water bodies in the world. Eutrophication is a major concern in the Baltic Sea due to the leakage of nutrients to the sea with agriculture being the primary source. Wheat (Triticum aestivum L.) is the most widely grown crop in the countries surrounding the Baltic Sea and thus promoting sustainable agriculture practices for wheat cultivation will have a major impact on reducing pollution in the Baltic Sea. This approach requires identifying and addressing key challenges for sustainable wheat production in the region. Implementing new technologies for climate-friendly breeding and digital farming across all surrounding countries should promote sustainable intensification of agriculture in the region. In this review, we highlight major challenges for wheat cultivation in the Baltic Sea region and discuss various solutions integrating transnational collaboration for pre-breeding and technology sharing to accelerate development of low input wheat cultivars with improved host plant resistance to pathogen and enhanced adaptability to the changing climate.
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Affiliation(s)
- Aakash Chawade
- Department of Plant Breeding, Swedish University of Agricultural Sciences (SLU), Alnarp, Sweden
| | - Rita Armoniené
- Department of Plant Breeding, Swedish University of Agricultural Sciences (SLU), Alnarp, Sweden
- Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry (LAMMC), Kedainiai, Lithuania
| | - Gunilla Berg
- Plant Protection Center, Swedish Board of Agriculture, Alnarp, Sweden
| | - Gintaras Brazauskas
- Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry (LAMMC), Kedainiai, Lithuania
| | | | - Mulatu Geleta
- Department of Plant Breeding, Swedish University of Agricultural Sciences (SLU), Alnarp, Sweden
| | - Andrii Gorash
- Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry (LAMMC), Kedainiai, Lithuania
| | | | - Kristiina Himanen
- Department of Agricultural Sciences, University of Helsinki, Helsinki, Finland
| | - Anne Ingver
- Estonian Crop Research Institute, Jõgeva, Estonia
| | - Eva Johansson
- Department of Plant Breeding, Swedish University of Agricultural Sciences (SLU), Alnarp, Sweden
| | | | - Mati Koppel
- Estonian Crop Research Institute, Jõgeva, Estonia
| | - Reine Koppel
- Estonian Crop Research Institute, Jõgeva, Estonia
| | - Pirjo Makela
- Department of Agricultural Sciences, University of Helsinki, Helsinki, Finland
| | - Rodomiro Ortiz
- Department of Plant Breeding, Swedish University of Agricultural Sciences (SLU), Alnarp, Sweden
| | - Wieslaw Podyma
- Plant Breeding and Acclimatization Institute, National Research Institute, Radzików, Poland
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Copenhagen, Denmark
| | - Antanas Ronis
- Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry (LAMMC), Kedainiai, Lithuania
| | | | | | - Martin Weih
- Department of Crop Production Ecology, SLU, Uppsala, Sweden
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28
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Kuska MT, Behmann J, Großkinsky DK, Roitsch T, Mahlein AK. Screening of Barley Resistance Against Powdery Mildew by Simultaneous High-Throughput Enzyme Activity Signature Profiling and Multispectral Imaging. Front Plant Sci 2018; 9:1074. [PMID: 30083181 PMCID: PMC6065056 DOI: 10.3389/fpls.2018.01074] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 07/03/2018] [Indexed: 05/13/2023]
Abstract
Molecular marker analysis allow for a rapid and advanced pre-selection and resistance screenings in plant breeding processes. During the phenotyping process, optical sensors have proved their potential to determine and assess the function of the genotype of the breeding material. Thereby, biomarkers for specific disease resistance traits provide valuable information for calibrating optical sensor approaches during early plant-pathogen interactions. In this context, the combination of physiological, metabolic phenotyping and phenomic profiles could establish efficient identification and quantification of relevant genotypes within breeding processes. Experiments were conducted with near-isogenic lines of H. vulgare (susceptible, mildew locus o (mlo) and Mildew locus a (Mla) resistant). Multispectral imaging of barley plants was daily conducted 0-8 days after inoculation (dai) in a high-throughput facility with 10 wavelength bands from 400 to 1,000 nm. In parallel, the temporal dynamics of the activities of invertase isoenzymes, as key sink specific enzymes that irreversibly cleave the transport sugar sucrose into the hexose monomers, were profiled in a semi high-throughput approach. The activities of cell wall, cytosolic and vacuole invertase revealed specific dynamics of the activity signatures for susceptible genotypes and genotypes with mlo and Mla based resistances 0-120 hours after inoculation (hai). These patterns could be used to differentiate between interaction types and revealed an early influence of Blumeria graminis f.sp. hordei (Bgh) conidia on the specific invertase activity already 0.5 hai. During this early powdery mildew pathogenesis, the reflectance intensity increased in the blue bands and at 690 nm. The Mla resistant plants showed an increased reflectance at 680 and 710 nm and a decreased reflectance in the near infrared bands from 3 dai. Applying a Support Vector Machine classification as a supervised machine learning approach, the pixelwise identification and quantification of powdery mildew diseased barley tissue and hypersensitive response spots were established. This enables an automatic identification of the barley-powdery mildew interaction. The study established a proof-of-concept for plant resistance phenotyping with multispectral imaging in high-throughput. The combination of invertase analysis and multispectral imaging showed to be a complementing validation system. This will provide a deeper understanding of optical data and its implementation into disease resistance screening.
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Affiliation(s)
- Matheus T. Kuska
- Institute for Crop Science and Resource Conservation-Plant Diseases and Plant Protection, University of Bonn, Bonn, Germany
| | - Jan Behmann
- Institute for Crop Science and Resource Conservation-Plant Diseases and Plant Protection, University of Bonn, Bonn, Germany
| | - Dominik K. Großkinsky
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Frederiksberg, Denmark
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Taastrup, Denmark
| | - Anne-Katrin Mahlein
- Institute for Crop Science and Resource Conservation-Plant Diseases and Plant Protection, University of Bonn, Bonn, Germany
- Institute of Sugar Beet Research (IfZ), Göttingen, Germany
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29
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Großkinsky DK, Syaifullah SJ, Roitsch T. Integration of multi-omics techniques and physiological phenotyping within a holistic phenomics approach to study senescence in model and crop plants. J Exp Bot 2018; 69:825-844. [PMID: 29444308 DOI: 10.1093/jxb/erx333] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The study of senescence in plants is complicated by diverse levels of temporal and spatial dynamics as well as the impact of external biotic and abiotic factors and crop plant management. Whereas the molecular mechanisms involved in developmentally regulated leaf senescence are very well understood, in particular in the annual model plant species Arabidopsis, senescence of other organs such as the flower, fruit, and root is much less studied as well as senescence in perennials such as trees. This review addresses the need for the integration of multi-omics techniques and physiological phenotyping into holistic phenomics approaches to dissect the complex phenomenon of senescence. That became feasible through major advances in the establishment of various, complementary 'omics' technologies. Such an interdisciplinary approach will also need to consider knowledge from the animal field, in particular in relation to novel regulators such as small, non-coding RNAs, epigenetic control and telomere length. Such a characterization of phenotypes via the acquisition of high-dimensional datasets within a systems biology approach will allow us to systematically characterize the various programmes governing senescence beyond leaf senescence in Arabidopsis and to elucidate the underlying molecular processes. Such a multi-omics approach is expected to also spur the application of results from model plants to agriculture and their verification for sustainable and environmentally friendly improvement of crop plant stress resilience and productivity and contribute to improvements based on postharvest physiology for the food industry and the benefit of its customers.
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Affiliation(s)
- Dominik K Großkinsky
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé, Taastrup, Denmark
| | - Syahnada Jaya Syaifullah
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé, Taastrup, Denmark
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé, Taastrup, Denmark
- Department of Adaptive Biotechnologies, Global Change Research Institute, CAS, v.v.i., Drásov, Czech Republic
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30
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Hirsche J, García Fernández JM, Stabentheiner E, Großkinsky DK, Roitsch T. Differential Effects of Carbohydrates on Arabidopsis Pollen Germination. Plant Cell Physiol 2017; 58:691-701. [PMID: 28339807 DOI: 10.1093/pcp/pcx020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Accepted: 01/30/2017] [Indexed: 05/12/2023]
Abstract
Pollen germination as a crucial process in plant development strongly depends on the accessibility of carbon as energy source. Carbohydrates, however, function not only as a primary energy source, but also as important signaling components. In a comprehensive study, we analyzed various aspects of the impact of 32 different sugars on in vitro germination of Arabidopsis pollen comprising about 150 variations of individual sugars and combinations. Twenty-six structurally different mono-, di- and oligosaccharides, and sugar analogs were initially tested for their ability to support pollen germination. Whereas several di- and oligosaccharides supported pollen germination, hexoses such as glucose, fructose and mannose did not support and even considerably inhibited pollen germination when added to germination-supporting medium. Complementary experiments using glucose analogs with varying functional features, the hexokinase inhibitor mannoheptulose and the glucose-insensitive hexokinase-deficient Arabidopsis mutant gin2-1 suggested that mannose- and glucose-mediated inhibition of sucrose-supported pollen germination depends partially on hexokinase signaling. The results suggest that, in addition to their role as energy source, sugars act as signaling molecules differentially regulating the complex process of pollen germination depending on their structural properties. Thus, a sugar-dependent multilayer regulation of Arabidopsis pollen germination is supported, which makes this approach a valuable experimental system for future studies addressing sugar sensing and signaling.
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Affiliation(s)
- Jörg Hirsche
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Würzburg, Germany
| | - José M García Fernández
- Instituto de Investigaciones Químicas, CSIC, Universidad de Sevilla, Américo Vespucio, Isla de la Cartuja, Sevilla, Spain
| | - Edith Stabentheiner
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, Graz, Austria
| | - Dominik K Großkinsky
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé, Taastrup, Denmark
| | - Thomas Roitsch
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Würzburg, Germany
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, Graz, Austria
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé, Taastrup, Denmark
- Global Change Research Institute CAS, Drásov, Drásov, Czech Republic
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31
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Goetz M, Guivarćh A, Hirsche J, Bauerfeind MA, González MC, Hyun TK, Eom SH, Chriqui D, Engelke T, Großkinsky DK, Roitsch T. Metabolic Control of Tobacco Pollination by Sugars and Invertases. Plant Physiol 2017; 173:984-997. [PMID: 27923989 PMCID: PMC5291038 DOI: 10.1104/pp.16.01601] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 12/01/2016] [Indexed: 05/21/2023]
Abstract
Pollination in flowering plants is initiated by germination of pollen grains on stigmas followed by fast growth of pollen tubes representing highly energy-consuming processes. The symplastic isolation of pollen grains and tubes requires import of Suc available in the apoplast. We show that the functional coupling of Suc cleavage by invertases and uptake of the released hexoses by monosaccharide transporters are critical for pollination in tobacco (Nicotiana tabacum). Transcript profiling, in situ hybridization, and immunolocalization of extracellular invertases and two monosaccharide transporters in vitro and in vivo support the functional coupling in supplying carbohydrates for pollen germination and tube growth evidenced by spatiotemporally coordinated expression. Detection of vacuolar invertases in maternal tissues by these approaches revealed metabolic cross talk between male and female tissues and supported the requirement for carbohydrate supply in transmitting tissue during pollination. Tissue-specific expression of an invertase inhibitor and addition of the chemical invertase inhibitor miglitol strongly reduced extracellular invertase activity and impaired pollen germination. Measurements of (competitive) uptake of labeled sugars identified two import pathways for exogenously available Suc into the germinating pollen operating in parallel: direct Suc uptake and via the hexoses after cleavage by extracellular invertase. Reduction of extracellular invertase activity in pollen decreases Suc uptake and severely compromises pollen germination. We further demonstrate that Glc as sole carbon source is sufficient for pollen germination, whereas Suc is supporting tube growth, revealing an important regulatory role of both the invertase substrate and products contributing to a potential metabolic and signaling-based multilayer regulation of pollination by carbohydrates.
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Affiliation(s)
- Marc Goetz
- Institut für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, 93053 Regensburg, Germany (M.G., T.R.)
- Laboratoire de Cytologie Expérimentale et Morphogenèse Végétale, Université Pierre et Marie Curie, 75252 Paris cedex 05, France (A.G., D.C.)
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Julius von Sachs Platz 2, D-97082 Würzburg, Germany (J.H., M.A.B., M.-C.G., T.K.H., S.H.E., T.E., T.R.)
- Department of Industrial Plant Science and Technology, College of Agricultural, Life, and Environmental Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea (T.K., S.H.E.)
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, 2630 Taastrup, Denmark (D.K.G., T.R.); and
- Global Change Research Centre, Czech Globe AS CR, Cz-664 24 Drásov, Czech Republic (T.R.)
| | - Anne Guivarćh
- Institut für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, 93053 Regensburg, Germany (M.G., T.R.)
- Laboratoire de Cytologie Expérimentale et Morphogenèse Végétale, Université Pierre et Marie Curie, 75252 Paris cedex 05, France (A.G., D.C.)
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Julius von Sachs Platz 2, D-97082 Würzburg, Germany (J.H., M.A.B., M.-C.G., T.K.H., S.H.E., T.E., T.R.)
- Department of Industrial Plant Science and Technology, College of Agricultural, Life, and Environmental Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea (T.K., S.H.E.)
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, 2630 Taastrup, Denmark (D.K.G., T.R.); and
- Global Change Research Centre, Czech Globe AS CR, Cz-664 24 Drásov, Czech Republic (T.R.)
| | - Jörg Hirsche
- Institut für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, 93053 Regensburg, Germany (M.G., T.R.)
- Laboratoire de Cytologie Expérimentale et Morphogenèse Végétale, Université Pierre et Marie Curie, 75252 Paris cedex 05, France (A.G., D.C.)
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Julius von Sachs Platz 2, D-97082 Würzburg, Germany (J.H., M.A.B., M.-C.G., T.K.H., S.H.E., T.E., T.R.)
- Department of Industrial Plant Science and Technology, College of Agricultural, Life, and Environmental Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea (T.K., S.H.E.)
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, 2630 Taastrup, Denmark (D.K.G., T.R.); and
- Global Change Research Centre, Czech Globe AS CR, Cz-664 24 Drásov, Czech Republic (T.R.)
| | - Martin Andreas Bauerfeind
- Institut für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, 93053 Regensburg, Germany (M.G., T.R.)
- Laboratoire de Cytologie Expérimentale et Morphogenèse Végétale, Université Pierre et Marie Curie, 75252 Paris cedex 05, France (A.G., D.C.)
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Julius von Sachs Platz 2, D-97082 Würzburg, Germany (J.H., M.A.B., M.-C.G., T.K.H., S.H.E., T.E., T.R.)
- Department of Industrial Plant Science and Technology, College of Agricultural, Life, and Environmental Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea (T.K., S.H.E.)
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, 2630 Taastrup, Denmark (D.K.G., T.R.); and
- Global Change Research Centre, Czech Globe AS CR, Cz-664 24 Drásov, Czech Republic (T.R.)
| | - María-Cruz González
- Institut für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, 93053 Regensburg, Germany (M.G., T.R.)
- Laboratoire de Cytologie Expérimentale et Morphogenèse Végétale, Université Pierre et Marie Curie, 75252 Paris cedex 05, France (A.G., D.C.)
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Julius von Sachs Platz 2, D-97082 Würzburg, Germany (J.H., M.A.B., M.-C.G., T.K.H., S.H.E., T.E., T.R.)
- Department of Industrial Plant Science and Technology, College of Agricultural, Life, and Environmental Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea (T.K., S.H.E.)
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, 2630 Taastrup, Denmark (D.K.G., T.R.); and
- Global Change Research Centre, Czech Globe AS CR, Cz-664 24 Drásov, Czech Republic (T.R.)
| | - Tae Kyung Hyun
- Institut für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, 93053 Regensburg, Germany (M.G., T.R.)
- Laboratoire de Cytologie Expérimentale et Morphogenèse Végétale, Université Pierre et Marie Curie, 75252 Paris cedex 05, France (A.G., D.C.)
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Julius von Sachs Platz 2, D-97082 Würzburg, Germany (J.H., M.A.B., M.-C.G., T.K.H., S.H.E., T.E., T.R.)
- Department of Industrial Plant Science and Technology, College of Agricultural, Life, and Environmental Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea (T.K., S.H.E.)
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, 2630 Taastrup, Denmark (D.K.G., T.R.); and
- Global Change Research Centre, Czech Globe AS CR, Cz-664 24 Drásov, Czech Republic (T.R.)
| | - Seung Hee Eom
- Institut für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, 93053 Regensburg, Germany (M.G., T.R.)
- Laboratoire de Cytologie Expérimentale et Morphogenèse Végétale, Université Pierre et Marie Curie, 75252 Paris cedex 05, France (A.G., D.C.)
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Julius von Sachs Platz 2, D-97082 Würzburg, Germany (J.H., M.A.B., M.-C.G., T.K.H., S.H.E., T.E., T.R.)
- Department of Industrial Plant Science and Technology, College of Agricultural, Life, and Environmental Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea (T.K., S.H.E.)
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, 2630 Taastrup, Denmark (D.K.G., T.R.); and
- Global Change Research Centre, Czech Globe AS CR, Cz-664 24 Drásov, Czech Republic (T.R.)
| | - Dominique Chriqui
- Institut für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, 93053 Regensburg, Germany (M.G., T.R.)
- Laboratoire de Cytologie Expérimentale et Morphogenèse Végétale, Université Pierre et Marie Curie, 75252 Paris cedex 05, France (A.G., D.C.)
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Julius von Sachs Platz 2, D-97082 Würzburg, Germany (J.H., M.A.B., M.-C.G., T.K.H., S.H.E., T.E., T.R.)
- Department of Industrial Plant Science and Technology, College of Agricultural, Life, and Environmental Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea (T.K., S.H.E.)
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, 2630 Taastrup, Denmark (D.K.G., T.R.); and
- Global Change Research Centre, Czech Globe AS CR, Cz-664 24 Drásov, Czech Republic (T.R.)
| | - Thomas Engelke
- Institut für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, 93053 Regensburg, Germany (M.G., T.R.)
- Laboratoire de Cytologie Expérimentale et Morphogenèse Végétale, Université Pierre et Marie Curie, 75252 Paris cedex 05, France (A.G., D.C.)
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Julius von Sachs Platz 2, D-97082 Würzburg, Germany (J.H., M.A.B., M.-C.G., T.K.H., S.H.E., T.E., T.R.)
- Department of Industrial Plant Science and Technology, College of Agricultural, Life, and Environmental Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea (T.K., S.H.E.)
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, 2630 Taastrup, Denmark (D.K.G., T.R.); and
- Global Change Research Centre, Czech Globe AS CR, Cz-664 24 Drásov, Czech Republic (T.R.)
| | - Dominik K Großkinsky
- Institut für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, 93053 Regensburg, Germany (M.G., T.R.)
- Laboratoire de Cytologie Expérimentale et Morphogenèse Végétale, Université Pierre et Marie Curie, 75252 Paris cedex 05, France (A.G., D.C.)
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Julius von Sachs Platz 2, D-97082 Würzburg, Germany (J.H., M.A.B., M.-C.G., T.K.H., S.H.E., T.E., T.R.)
- Department of Industrial Plant Science and Technology, College of Agricultural, Life, and Environmental Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea (T.K., S.H.E.)
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, 2630 Taastrup, Denmark (D.K.G., T.R.); and
- Global Change Research Centre, Czech Globe AS CR, Cz-664 24 Drásov, Czech Republic (T.R.)
| | - Thomas Roitsch
- Institut für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, 93053 Regensburg, Germany (M.G., T.R.);
- Laboratoire de Cytologie Expérimentale et Morphogenèse Végétale, Université Pierre et Marie Curie, 75252 Paris cedex 05, France (A.G., D.C.);
- Lehrstuhl für Pharmazeutische Biologie, Universität Würzburg, Julius von Sachs Platz 2, D-97082 Würzburg, Germany (J.H., M.A.B., M.-C.G., T.K.H., S.H.E., T.E., T.R.);
- Department of Industrial Plant Science and Technology, College of Agricultural, Life, and Environmental Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea (T.K., S.H.E.);
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, 2630 Taastrup, Denmark (D.K.G., T.R.); and
- Global Change Research Centre, Czech Globe AS CR, Cz-664 24 Drásov, Czech Republic (T.R.)
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Covington Dunn E, Roitsch T, Dermastia M. Determination of the Activity Signature of Key Carbohydrate Metabolism Enzymes in Phenolic-rich Grapevine Tissues. Acta Chim Slov 2016; 63:757-762. [PMID: 28004081 DOI: 10.17344/acsi.2016.2484] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Physiological studies in plants often require enzyme extraction from tissues containing high concentrations of phenols and polyphenols. Unless removed or neutralized, such compounds may hinder extraction, inactivate enzymes, and interfere with enzyme detection. The following protocol for activity assays for enzymes of primary carbohydrate metabolism, while based on our recently published one for quantitative measurement of activities using coupled spectrophotometric assays in a 96-well format, is tailored to the complexities of phenolic- and anthocyanin-rich extracts from grapevine leaf. As a case study we applied the protocol to grapevine leaf samples infected with plant pathogenic bacteria 'Candidatus Phytoplasma solani', known to alter carbohydrate metabolism in grapevine. The described adaptations may be useful for determination of metabolic fingerprints for physiological phenotyping of other plant species with inherently high levels of phenolic compounds.
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Prezelj N, Covington E, Roitsch T, Gruden K, Fragner L, Weckwerth W, Chersicola M, Vodopivec M, Dermastia M. Metabolic Consequences of Infection of Grapevine (Vitis vinifera L.) cv. "Modra frankinja" with Flavescence Dorée Phytoplasma. Front Plant Sci 2016; 7:711. [PMID: 27242887 PMCID: PMC4876132 DOI: 10.3389/fpls.2016.00711] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 05/09/2016] [Indexed: 05/18/2023]
Abstract
Flavescence dorée, caused by the quarantine phytoplasma FDp, represents the most devastating of the grapevine yellows diseases in Europe. In an integrated study we have explored the FDp-grapevine interaction in infected grapevines of cv. "Modra frankinja" under natural conditions in the vineyard. In FDp-infected leaf vein-enriched tissues, the seasonal transcriptional profiles of 14 genes selected from various metabolic pathways showed an FDp-specific plant response compared to other grapevine yellows and uncovered a new association of the SWEET17a vacuolar transporter of fructose with pathogens. Non-targeted metabolome analysis from leaf vein-enriched tissues identified 22 significantly changed compounds with increased levels during infection. Several metabolites corroborated the gene expression study. Detailed investigation of the dynamics of carbohydrate metabolism revealed significant accumulation of sucrose and starch in the mesophyll of FDp-infected leaves, as well as significant up-regulation of genes involved in their biosynthesis. In addition, infected leaves had high activities of ADP-glucose pyrophosphorylase and, more significantly, sucrose synthase. The data support the conclusion that FDp infection inhibits phloem transport, resulting in accumulation of carbohydrates and secondary metabolites that provoke a source-sink transition and defense response status.
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Affiliation(s)
- Nina Prezelj
- Department of Biotechnology and Systems Biology, National Institute of BiologyLjubljana, Slovenia
| | - Elizabeth Covington
- Department of Biotechnology and Systems Biology, National Institute of BiologyLjubljana, Slovenia
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of CopenhagenTaastrup, Denmark
- Global Change Research Centre, Czech Globe AS CR, v.v.i.Drásov, Czech Republic
| | - Kristina Gruden
- Department of Biotechnology and Systems Biology, National Institute of BiologyLjubljana, Slovenia
| | - Lena Fragner
- Department of Ecogenomics and Systems Biology, Faculty of Life Sciences, University of ViennaVienna, Austria
| | - Wolfram Weckwerth
- Department of Ecogenomics and Systems Biology, Faculty of Life Sciences, University of ViennaVienna, Austria
- Vienna Metabolomics Center (VIME), University of ViennaVienna, Austria
| | - Marko Chersicola
- Department of Biotechnology and Systems Biology, National Institute of BiologyLjubljana, Slovenia
- Jožef Stefan International Postgraduate SchoolLjubljana, Slovenia
| | - Maja Vodopivec
- Department of Biotechnology and Systems Biology, National Institute of BiologyLjubljana, Slovenia
| | - Marina Dermastia
- Department of Biotechnology and Systems Biology, National Institute of BiologyLjubljana, Slovenia
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Großkinsky DK, Tafner R, Moreno MV, Stenglein SA, García de Salamone IE, Nelson LM, Novák O, Strnad M, van der Graaff E, Roitsch T. Cytokinin production by Pseudomonas fluorescens G20-18 determines biocontrol activity against Pseudomonas syringae in Arabidopsis. Sci Rep 2016; 6:23310. [PMID: 26984671 PMCID: PMC4794740 DOI: 10.1038/srep23310] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 03/04/2016] [Indexed: 12/16/2022] Open
Abstract
Plant beneficial microbes mediate biocontrol of diseases by interfering with pathogens or via strengthening the host. Although phytohormones, including cytokinins, are known to regulate plant development and physiology as well as plant immunity, their production by microorganisms has not been considered as a biocontrol mechanism. Here we identify the ability of Pseudomonas fluorescens G20-18 to efficiently control P. syringae infection in Arabidopsis, allowing maintenance of tissue integrity and ultimately biomass yield. Microbial cytokinin production was identified as a key determinant for this biocontrol effect on the hemibiotrophic bacterial pathogen. While cytokinin-deficient loss-of-function mutants of G20-18 exhibit impaired biocontrol, functional complementation with cytokinin biosynthetic genes restores cytokinin-mediated biocontrol, which is correlated with differential cytokinin levels in planta. Arabidopsis mutant analyses revealed the necessity of functional plant cytokinin perception and salicylic acid-dependent defence signalling for this biocontrol mechanism. These results demonstrate microbial cytokinin production as a novel microbe-based, hormone-mediated concept of biocontrol. This mechanism provides a basis to potentially develop novel, integrated plant protection strategies combining promotion of growth, a favourable physiological status and activation of fine-tuned direct defence and abiotic stress resilience.
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Affiliation(s)
- Dominik K Großkinsky
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630 Taastrup, Denmark.,Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria
| | - Richard Tafner
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria
| | - María V Moreno
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria.,Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-CICBA-INBIOTEC-CONICET, Facultad de Agronomía de Azul-UNCPBA, Av. República de Italia 780, 7300 Azul, Buenos Aires, Argentina.,Cátedra de Microbiología, Facultad de Agronomía de Azul-UNCPBA, Av. República de Italia 780, 7300 Azul, Buenos Aires, Argentina
| | - Sebastian A Stenglein
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria.,Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-CICBA-INBIOTEC-CONICET, Facultad de Agronomía de Azul-UNCPBA, Av. República de Italia 780, 7300 Azul, Buenos Aires, Argentina.,Cátedra de Microbiología, Facultad de Agronomía de Azul-UNCPBA, Av. República de Italia 780, 7300 Azul, Buenos Aires, Argentina
| | - Inés E García de Salamone
- Cátedra de Microbiología Agrícola, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, Buenos Aires 1417, Argentina
| | - Louise M Nelson
- Department of Biology, Irving K Barber School of Arts and Sciences, University of British Columbia Okanagan Campus, 3333 University Way, Kelowna, BC V1V 1V7, Canada
| | - Ondřej Novák
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR &Faculty of Science, Palacký University, Olomouc, Czech Republic
| | - Miroslav Strnad
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR &Faculty of Science, Palacký University, Olomouc, Czech Republic
| | - Eric van der Graaff
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630 Taastrup, Denmark.,Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630 Taastrup, Denmark.,Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria.,Global Change Research Centre, Czech Globe AS CR, v.v.i., Drásov 470, Cz-664 24 Drásov, Czech Republic
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35
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Gasperl A, Morvan-Bertrand A, Prud'homme MP, van der Graaff E, Roitsch T. Exogenous Classic Phytohormones Have Limited Regulatory Effects on Fructan and Primary Carbohydrate Metabolism in Perennial Ryegrass (Lolium perenne L.). Front Plant Sci 2016; 6:1251. [PMID: 26834764 PMCID: PMC4719101 DOI: 10.3389/fpls.2015.01251] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 12/21/2015] [Indexed: 05/05/2023]
Abstract
Fructans are polymers of fructose and one of the main constituents of water-soluble carbohydrates in forage grasses and cereal crops of temperate climates. Fructans are involved in cold and drought resistance, regrowth following defoliation and early spring growth, seed filling, have beneficial effects on human health and are used for industrial processes. Perennial ryegrass (Lolium perenne L.) serves as model species to study fructan metabolism. Fructan metabolism is under the control of both synthesis by fructosyltransferases (FTs) and breakdown through fructan exohydrolases (FEHs). The accumulation of fructans can be triggered by high sucrose levels and abiotic stress conditions such as drought and cold stress. However, detailed studies on the mechanisms involved in the regulation of fructan metabolism are scarce. Since different phytohormones, especially abscisic acid (ABA), are known to play an important role in abiotic stress responses, the possible short term regulation of the enzymes involved in fructan metabolism by the five classical phytohormones was investigated. Therefore, the activities of enzymes involved in fructan synthesis and breakdown, the expression levels for the corresponding genes and levels for water-soluble carbohydrates were determined following pulse treatments with ABA, auxin (AUX), ethylene (ET), gibberellic acid (GA), or kinetin (KIN). The most pronounced fast effects were a transient increase of FT activities by AUX, KIN, ABA, and ET, while minor effects were evident for 1-FEH activity with an increased activity in response to KIN and a decrease by GA. Fructan and sucrose levels were not affected. This observed discrepancy demonstrates the importance of determining enzyme activities to obtain insight into the physiological traits and ultimately the plant phenotype. The comparative analyses of activities for seven key enzymes of primary carbohydrate metabolism revealed no co-regulation between enzymes of the fructan and sucrose pool.
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Affiliation(s)
- Anna Gasperl
- Institute of Plant Sciences, Karl-Franzens-Universität GrazGraz, Austria
| | - Annette Morvan-Bertrand
- Normandie UniversitéCaen, France
- UMR 950 Ecophysiologie Végétale, Agronomie et Nutritions NCS, Université de Caen NormandieCaen, France
- INRA, UMR 950 Ecophysiologie Végétale, Agronomie et Nutritions NCSCaen, France
| | - Marie-Pascale Prud'homme
- Normandie UniversitéCaen, France
- UMR 950 Ecophysiologie Végétale, Agronomie et Nutritions NCS, Université de Caen NormandieCaen, France
- INRA, UMR 950 Ecophysiologie Végétale, Agronomie et Nutritions NCSCaen, France
| | | | - Thomas Roitsch
- Institute of Plant Sciences, Karl-Franzens-Universität GrazGraz, Austria
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Gasperl A, Morvan-Bertrand A, Prud’homme MP, van der Graaff E, Roitsch T. A Simple and Fast Kinetic Assay for the Determination of Fructan Exohydrolase Activity in Perennial Ryegrass (Lolium perenne L.). Front Plant Sci 2015; 6:1154. [PMID: 26734049 PMCID: PMC4686730 DOI: 10.3389/fpls.2015.01154] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 12/04/2015] [Indexed: 05/16/2023]
Abstract
Despite the fact that fructans are the main constituent of water-soluble carbohydrates in forage grasses and cereal crops of temperate climates, little knowledge is available on the regulation of the enzymes involved in fructan metabolism. The analysis of enzyme activities involved in this process has been hampered by the low affinity of the fructan enzymes for sucrose and fructans used as fructosyl donor. Further, the analysis of fructan composition and enzyme activities is restricted to specialized labs with access to suited HPLC equipment and appropriate fructan standards. The degradation of fructan polymers with high degree of polymerization (DP) by fructan exohydrolases (FEHs) to fructosyloligomers is important to liberate energy in the form of fructan, but also under conditions where the generation of low DP polymers is required. Based on published protocols employing enzyme coupled endpoint reactions in single cuvettes, we developed a simple and fast kinetic 1-FEH assay. This assay can be performed in multi-well plate format using plate readers to determine the activity of 1-FEH against 1-kestotriose, resulting in a significant time reduction. Kinetic assays allow an optimal and more precise determination of enzyme activities compared to endpoint assays, and enable to check the quality of any reaction with respect to linearity of the assay. The enzyme coupled kinetic 1-FEH assay was validated in a case study showing the expected increase in 1-FEH activity during cold treatment. This assay is cost effective and could be performed by any lab with access to a plate reader suited for kinetic measurements and readings at 340 nm, and is highly suited to assess temporal changes and relative differences in 1-FEH activities. Thus, this enzyme coupled kinetic 1-FEH assay is of high importance both to the field of basic fructan research and plant breeding.
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Affiliation(s)
- Anna Gasperl
- Institute of Plant Sciences, Karl-Franzens-Universität GrazGraz, Austria
| | - Annette Morvan-Bertrand
- Normandie Université, CaenFrance
- UMR 950 Ecophysiologie Végétale, Agronomie et Nutritions NCS, Université de Caen NormandieCaen, France
- INRA, UMR 950 Ecophysiologie Végétale, Agronomie et Nutritions NCSCaen, France
| | - Marie-Pascale Prud’homme
- Normandie Université, CaenFrance
- UMR 950 Ecophysiologie Végétale, Agronomie et Nutritions NCS, Université de Caen NormandieCaen, France
- INRA, UMR 950 Ecophysiologie Végétale, Agronomie et Nutritions NCSCaen, France
| | | | - Thomas Roitsch
- Institute of Plant Sciences, Karl-Franzens-Universität GrazGraz, Austria
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of CopenhagenCopenhagen, Denmark
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Großkinsky DK, Pieruschka R, Svensgaard J, Rascher U, Christensen S, Schurr U, Roitsch T. Phenotyping in the fields: dissecting the genetics of quantitative traits and digital farming. New Phytol 2015; 207:950-2. [PMID: 26235487 DOI: 10.1111/nph.13529] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Affiliation(s)
- Dominik K Großkinsky
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630, Taastrup, Denmark
| | - Roland Pieruschka
- European Plant Phenotyping Network and Forschungszentrum Jülich GmbH, Institut für Bio- und Geowissenschaften, IBG-2, Pflanzenwissenschaften, D-52425, Jülich, Germany
| | - Jesper Svensgaard
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630, Taastrup, Denmark
| | - Uwe Rascher
- European Plant Phenotyping Network and Forschungszentrum Jülich GmbH, Institut für Bio- und Geowissenschaften, IBG-2, Pflanzenwissenschaften, D-52425, Jülich, Germany
| | - Svend Christensen
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630, Taastrup, Denmark
| | - Ulrich Schurr
- European Plant Phenotyping Network and Forschungszentrum Jülich GmbH, Institut für Bio- und Geowissenschaften, IBG-2, Pflanzenwissenschaften, D-52425, Jülich, Germany
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630, Taastrup, Denmark
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Großkinsky DK, Svensgaard J, Christensen S, Roitsch T. Plant phenomics and the need for physiological phenotyping across scales to narrow the genotype-to-phenotype knowledge gap. J Exp Bot 2015; 66:5429-40. [PMID: 26163702 DOI: 10.1093/jxb/erv345] [Citation(s) in RCA: 105] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Plants are affected by complex genome×environment×management interactions which determine phenotypic plasticity as a result of the variability of genetic components. Whereas great advances have been made in the cost-efficient and high-throughput analyses of genetic information and non-invasive phenotyping, the large-scale analyses of the underlying physiological mechanisms lag behind. The external phenotype is determined by the sum of the complex interactions of metabolic pathways and intracellular regulatory networks that is reflected in an internal, physiological, and biochemical phenotype. These various scales of dynamic physiological responses need to be considered, and genotyping and external phenotyping should be linked to the physiology at the cellular and tissue level. A high-dimensional physiological phenotyping across scales is needed that integrates the precise characterization of the internal phenotype into high-throughput phenotyping of whole plants and canopies. By this means, complex traits can be broken down into individual components of physiological traits. Since the higher resolution of physiological phenotyping by 'wet chemistry' is inherently limited in throughput, high-throughput non-invasive phenotyping needs to be validated and verified across scales to be used as proxy for the underlying processes. Armed with this interdisciplinary and multidimensional phenomics approach, plant physiology, non-invasive phenotyping, and functional genomics will complement each other, ultimately enabling the in silico assessment of responses under defined environments with advanced crop models. This will allow generation of robust physiological predictors also for complex traits to bridge the knowledge gap between genotype and phenotype for applications in breeding, precision farming, and basic research.
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Affiliation(s)
- Dominik K Großkinsky
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630 Taastrup, Denmark
| | - Jesper Svensgaard
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630 Taastrup, Denmark
| | - Svend Christensen
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630 Taastrup, Denmark
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630 Taastrup, Denmark Global Change Research Centre, Czech Globe AS CR, v.v.i.., Drásov 470, Cz-664 24 Drásov, Czech Republic
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Jammer A, Gasperl A, Luschin-Ebengreuth N, Heyneke E, Chu H, Cantero-Navarro E, Großkinsky DK, Albacete AA, Stabentheiner E, Franzaring J, Fangmeier A, van der Graaff E, Roitsch T. Simple and robust determination of the activity signature of key carbohydrate metabolism enzymes for physiological phenotyping in model and crop plants. J Exp Bot 2015; 66:5531-42. [PMID: 26002973 DOI: 10.1093/jxb/erv228] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The analysis of physiological parameters is important to understand the link between plant phenotypes and their genetic bases, and therefore is needed as an important element in the analysis of model and crop plants. The activities of enzymes involved in primary carbohydrate metabolism have been shown to be strongly associated with growth performance, crop yield, and quality, as well as stress responses. A simple, fast, and cost-effective method to determine activities for 13 key enzymes involved in carbohydrate metabolism has been established, mainly based on coupled spectrophotometric kinetic assays. The comparison of extraction buffers and requirement for dialysis of crude protein extracts resulted in a universal protein extraction protocol, suitable for the preparation of protein extracts from different organs of various species. Individual published kinetic activity assays were optimized and adapted for a semi-high-throughput 96-well assay format. These assays proved to be robust and are thus suitable for physiological phenotyping, enabling the characterization and diagnosis of the physiological state. The potential of the determination of distinct enzyme activity signatures as part of a physiological fingerprint was shown for various organs and tissues from three monocot and five dicot model and crop species, including two case studies with external stimuli. Differential and specific enzyme activity signatures are apparent during inflorescence development and upon in vitro cold treatment of young inflorescences in the monocot ryegrass, related to conditions for doubled haploid formation. Likewise, treatment of dicot spring oilseed rape with elevated CO2 concentration resulted in distinct patterns of enzyme activity responses in leaves.
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Affiliation(s)
- Alexandra Jammer
- Institute of Plant Sciences, Karl-Franzens-Universität Graz, Schubertstrasse 51, 8010 Graz, Austria
| | - Anna Gasperl
- Institute of Plant Sciences, Karl-Franzens-Universität Graz, Schubertstrasse 51, 8010 Graz, Austria
| | - Nora Luschin-Ebengreuth
- Institute of Plant Sciences, Karl-Franzens-Universität Graz, Schubertstrasse 51, 8010 Graz, Austria
| | - Elmien Heyneke
- Institute of Plant Sciences, Karl-Franzens-Universität Graz, Schubertstrasse 51, 8010 Graz, Austria
| | - Hyosub Chu
- Institute of Plant Sciences, Karl-Franzens-Universität Graz, Schubertstrasse 51, 8010 Graz, Austria
| | - Elena Cantero-Navarro
- Institute of Plant Sciences, Karl-Franzens-Universität Graz, Schubertstrasse 51, 8010 Graz, Austria
| | - Dominik K Großkinsky
- Institute of Plant Sciences, Karl-Franzens-Universität Graz, Schubertstrasse 51, 8010 Graz, Austria
| | - Alfonso A Albacete
- Institute of Plant Sciences, Karl-Franzens-Universität Graz, Schubertstrasse 51, 8010 Graz, Austria
| | - Edith Stabentheiner
- Institute of Plant Sciences, Karl-Franzens-Universität Graz, Schubertstrasse 51, 8010 Graz, Austria
| | - Jürgen Franzaring
- Institute of Landscape and Plant Ecology, University of Hohenheim, August-von-Hartmann-Strasse 3, D-70599 Stuttgart, Germany
| | - Andreas Fangmeier
- Institute of Landscape and Plant Ecology, University of Hohenheim, August-von-Hartmann-Strasse 3, D-70599 Stuttgart, Germany
| | - Eric van der Graaff
- Institute of Plant Sciences, Karl-Franzens-Universität Graz, Schubertstrasse 51, 8010 Graz, Austria
| | - Thomas Roitsch
- Institute of Plant Sciences, Karl-Franzens-Universität Graz, Schubertstrasse 51, 8010 Graz, Austria
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Hyun TK, Albacete A, van der Graaff E, Eom SH, Großkinsky DK, Böhm H, Janschek U, Rim Y, Ali WW, Kim SY, Roitsch T. The Arabidopsis PLAT domain protein1 promotes abiotic stress tolerance and growth in tobacco. Transgenic Res 2015; 24:651-63. [PMID: 25757741 DOI: 10.1007/s11248-015-9868-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Accepted: 03/04/2015] [Indexed: 11/25/2022]
Abstract
Plant growth and consequently crop yield can be severely compromised by abiotic and biotic stress conditions. Transgenic approaches that resulted in increased tolerance against abiotic stresses often were typically accompanied by adverse effects on plant growth and fitness under optimal growing conditions. Proteins that belong to the PLAT-plant-stress protein family harbour a single PLAT (Polycystin, Lipoxygenase, Alpha-toxin and Triacylglycerol lipase) domain and are ubiquitously present in monocot and dicot plant species. Until now, only limited data is available for PLAT-plant-stress family members, which suggested that these proteins in general could promote tolerance towards stress responses. We studied the function of the Arabidopsis PLAT-plant-stress protein AtPLAT1 employing heterologous gain-of-function analysis in tobacco. AtPLAT1 conferred increased abiotic stress tolerance in tobacco, evident by improved tolerance towards cold, drought and salt stresses, and promoted growth, reflected by a faster development under non-stressed conditions. However, the overexpression of AtPLAT1 in tobacco reduced the tolerance towards biotic stress conditions and, therefore, could be involved in regulating the crosstalk between abiotic and biotic stress responses. Thus, we showed that heterologously expressed AtPLAT1 functions as positive regulator of abiotic stress tolerance and plant growth, which could be an important new asset for strategies to develop plants with improved abiotic stress tolerance, without growth and subsequent yield penalties under optimal growth conditions.
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Affiliation(s)
- Tae Kyung Hyun
- Institute of Plant Sciences, University of Graz, 8010, Graz, Austria
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Koeslin-Findeklee F, Becker MA, van der Graaff E, Roitsch T, Horst WJ. Differences between winter oilseed rape (Brassica napus L.) cultivars in nitrogen starvation-induced leaf senescence are governed by leaf-inherent rather than root-derived signals. J Exp Bot 2015; 66:3669-81. [PMID: 25944925 PMCID: PMC4473979 DOI: 10.1093/jxb/erv170] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Nitrogen (N) efficiency of winter oilseed rape (Brassica napus L.) line-cultivars (cvs.), defined as high grain yield under N limitation, has been primarily attributed to maintained N uptake during reproductive growth (N uptake efficiency) in combination with delayed senescence of the older leaves accompanied with maintained photosynthetic capacity (functional stay-green). However, it is not clear whether genotypic variation in N starvation-induced leaf senescence is due to leaf-inherent factors and/or governed by root-mediated signals. Therefore, the N-efficient and stay-green cvs. NPZ-1 and Apex were reciprocally grafted with the N-inefficient and early-senescing cvs. NPZ-2 and Capitol, respectively and grown in hydroponics. The senescence status of older leaves after 12 days of N starvation assessed by SPAD, photosynthesis and the expression of the senescence-specific cysteine protease gene SAG12-1 revealed that the stay-green phenotype of the cvs. NPZ-1 and Apex under N starvation was primarily under the control of leaf-inherent factors. The same four cultivars were submitted to N starvation for up to 12 days in a time-course experiment. The specific leaf contents of biologically active and inactive cytokinins (CKs) and the expression of genes involved in CK homeostasis revealed that under N starvation leaves of early-senescing cultivars were characterized by inactivation of biologically active CKs, whereas in stay-green cultivars synthesis, activation, binding of and response to biologically active CKs were favoured. These results suggest that the homeostasis of biologically active CKs was the predominant leaf-inherent factor for cultivar differences in N starvation-induced leaf senescence and thus N efficiency.
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Affiliation(s)
- Fabian Koeslin-Findeklee
- Institute of Plant Nutrition, Leibniz University of Hannover, Herrenhäuser Str. 2, D-30419 Hannover, Germany
| | - Martin A Becker
- Institute of Plant Nutrition, Leibniz University of Hannover, Herrenhäuser Str. 2, D-30419 Hannover, Germany
| | - Eric van der Graaff
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Center, University of Copenhagen, Højbakkegård Allé13, DK-2630 Taastrup, Denmark
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Center, University of Copenhagen, Højbakkegård Allé13, DK-2630 Taastrup, Denmark Global Change Research Centre, CzechGlobe AS CR, v.v.i., Drásov 470, Cz-664 24 Drásov, Czech Republic
| | - Walter J Horst
- Institute of Plant Nutrition, Leibniz University of Hannover, Herrenhäuser Str. 2, D-30419 Hannover, Germany
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Albacete A, Cantero-Navarro E, Großkinsky DK, Arias CL, Balibrea ME, Bru R, Fragner L, Ghanem ME, de la Cruz González M, Hernández JA, Martínez-Andújar C, van der Graaff E, Weckwerth W, Zellnig G, Pérez-Alfocea F, Roitsch T. Ectopic overexpression of the cell wall invertase gene CIN1 leads to dehydration avoidance in tomato. J Exp Bot 2015; 66:3431-3432. [PMID: 25998902 PMCID: PMC4449540 DOI: 10.1093/jxb/erv134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- Alfonso Albacete
- Department of Plant Nutrition, CEBAS-CSIC, Campus de Espinardo, 30100 Murcia, Spain Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria
| | | | - Dominik K Großkinsky
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, DK-2630 Taastrup, Denmark
| | - Cintia L Arias
- Centro de Estudios Fotosintéticos y Bioquímicos, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, Argentina
| | | | - Roque Bru
- Departamento de Agroquímica y Bioquímica, Facultad de Ciencias, Universidad de Alicante, 03080 Alicante, Spain
| | - Lena Fragner
- Department of Molecular Systems Biology, Faculty of Life Sciences, University of Vienna, 1090 Vienna, Austria
| | - Michel E Ghanem
- Department of Plant Nutrition, CEBAS-CSIC, Campus de Espinardo, 30100 Murcia, Spain
| | | | - Jose A Hernández
- Department of Fruit Breeding, CEBAS-CSIC, Campus de Espinardo, 30100 Murcia, Spain
| | | | - Eric van der Graaff
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, DK-2630 Taastrup, Denmark
| | - Wolfram Weckwerth
- Department of Molecular Systems Biology, Faculty of Life Sciences, University of Vienna, 1090 Vienna, Austria
| | - Günther Zellnig
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria
| | | | - Thomas Roitsch
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, DK-2630 Taastrup, Denmark Global Change Research Centre, Czech Globe AS CR, v.v.i.., Drásov 470, Cz-664 24 Drásov, Czech Republic
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Albacete A, Cantero-Navarro E, Großkinsky DK, Arias CL, Balibrea ME, Bru R, Fragner L, Ghanem ME, González MDLC, Hernández JA, Martínez-Andújar C, van der Graaff E, Weckwerth W, Zellnig G, Pérez-Alfocea F, Roitsch T. Ectopic overexpression of the cell wall invertase gene CIN1 leads to dehydration avoidance in tomato. J Exp Bot 2015; 66:863-78. [PMID: 25392479 PMCID: PMC4321548 DOI: 10.1093/jxb/eru448] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Drought stress conditions modify source-sink relations, thereby influencing plant growth, adaptive responses, and consequently crop yield. Invertases are key metabolic enzymes regulating sink activity through the hydrolytic cleavage of sucrose into hexose monomers, thus playing a crucial role in plant growth and development. However, the physiological role of invertases during adaptation to abiotic stress conditions is not yet fully understood. Here it is shown that plant adaptation to drought stress can be markedly improved in tomato (Solanum lycopersicum L.) by overexpression of the cell wall invertase (cwInv) gene CIN1 from Chenopodium rubrum. CIN1 overexpression limited stomatal conductance under normal watering regimes, leading to reduced water consumption during the drought period, while photosynthetic activity was maintained. This caused a strong increase in water use efficiency (up to 50%), markedly improving water stress adaptation through an efficient physiological strategy of dehydration avoidance. Drought stress strongly reduced cwInv activity and induced its proteinaceous inhibitor in the leaves of the wild-type plants. However, the CIN1-overexpressing plants registered 3- to 6-fold higher cwInv activity in all analysed conditions. Surprisingly, the enhanced invertase activity did not result in increased hexose concentrations due to the activation of the metabolic carbohydrate fluxes, as reflected by the maintenance of the activity of key enzymes of primary metabolism and increased levels of sugar-phosphate intermediates under water deprivation. The induced sink metabolism in the leaves explained the maintenance of photosynthetic activity, delayed senescence, and increased source activity under drought stress. Moreover, CIN1 plants also presented a better control of production of reactive oxygen species and sustained membrane protection. Those metabolic changes conferred by CIN1 overexpression were accompanied by increases in the concentrations of the senescence-delaying hormone trans-zeatin and decreases in the senescence-inducing ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) in the leaves. Thus, cwInv critically functions at the integration point of metabolic, hormonal, and stress signals, providing a novel strategy to overcome drought-induced limitations to crop yield, without negatively affecting plant fitness under optimal growth conditions.
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Affiliation(s)
- Alfonso Albacete
- Department of Plant Nutrition, CEBAS-CSIC, Campus de Espinardo, 30100 Murcia, Spain Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria
| | | | - Dominik K Großkinsky
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, DK-2630 Taastrup, Denmark
| | - Cintia L Arias
- Centro de Estudios Fotosintéticos y Bioquímicos, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, Argentina
| | | | - Roque Bru
- Departamento de Agroquímica y Bioquímica, Facultad de Ciencias, Universidad de Alicante, 03080 Alicante, Spain
| | - Lena Fragner
- Department of Molecular Systems Biology, Faculty of Life Sciences, University of Vienna, 1090 Vienna, Austria
| | - Michel E Ghanem
- Department of Plant Nutrition, CEBAS-CSIC, Campus de Espinardo, 30100 Murcia, Spain
| | | | - Jose A Hernández
- Department of Fruit Breeding, CEBAS-CSIC, Campus de Espinardo, 30100 Murcia, Spain
| | | | - Eric van der Graaff
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, DK-2630 Taastrup, Denmark
| | - Wolfram Weckwerth
- Department of Molecular Systems Biology, Faculty of Life Sciences, University of Vienna, 1090 Vienna, Austria
| | - Günther Zellnig
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria
| | | | - Thomas Roitsch
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, DK-2630 Taastrup, Denmark Global Change Research Centre, Czech Globe AS CR, v.v.i., Drásov 470, Cz-664 24 Drásov, Czech Republic
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Großkinsky DK, van der Graaff E, Roitsch T. Abscisic Acid-Cytokinin Antagonism Modulates Resistance Against Pseudomonas syringae in Tobacco. Phytopathology 2014; 104:1283-8. [PMID: 24941328 DOI: 10.1094/phyto-03-14-0076-r] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Phytohormones are known as essential regulators of plant defenses, with ethylene, jasmonic acid, and salicylic acid as the central immunity backbone, while other phytohormones have been demonstrated to interact with this. Only recently, a function of the classic phytohormone cytokinin in plant immunity has been described in Arabidopsis, rice, and tobacco. Although interactions of cytokinins with salicylic acid and auxin have been indicated, the complete network of cytokinin interactions with other immunity-relevant phytohormones is not yet understood. Therefore, we studied the interaction of kinetin and abscisic acid as a negative regulator of plant immunity to modulate resistance in tobacco against Pseudomonas syringae. By analyzing infection symptoms, pathogen proliferation, and accumulation of the phytoalexin scopoletin as a key mediator of kinetin-induced resistance in tobacco, antagonistic interaction of these phytohormones in plant immunity was identified. Kinetin reduced abscisic acid levels in tobacco, while increased abscisic acid levels by exogenous application or inhibition of abscisic acid catabolism by diniconazole neutralized kinetin-induced resistance. Based on these results, we conclude that reduction of abscisic acid levels by enhanced abscisic acid catabolism strongly contributes to cytokinin-mediated resistance effects. Thus, the identified cytokinin-abscisic acid antagonism is a novel regulatory mechanism in plant immunity.
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Hyun TK, van der Graaff E, Albacete A, Eom SH, Großkinsky DK, Böhm H, Janschek U, Rim Y, Ali WW, Kim SY, Roitsch T. The Arabidopsis PLAT domain protein1 is critically involved in abiotic stress tolerance. PLoS One 2014; 9:e112946. [PMID: 25396746 PMCID: PMC4232524 DOI: 10.1371/journal.pone.0112946] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 10/17/2014] [Indexed: 11/19/2022] Open
Abstract
Despite the completion of the Arabidopsis genome sequence, for only a relatively low percentage of the encoded proteins experimental evidence concerning their function is available. Plant proteins that harbour a single PLAT (Polycystin, Lipoxygenase, Alpha-toxin and Triacylglycerol lipase) domain and belong to the PLAT-plant-stress protein family are ubiquitously present in monocot and dicots. However, the function of PLAT-plant-stress proteins is still poorly understood. Therefore, we have assessed the function of the uncharacterised Arabidopsis PLAT-plant-stress family members through a combination of functional genetic and physiological approaches. PLAT1 overexpression conferred increased abiotic stress tolerance, including cold, drought and salt stress, while loss-of-function resulted in opposite effects on abiotic stress tolerance. Strikingly, PLAT1 promoted growth under non-stressed conditions. Abiotic stress treatments induced PLAT1 expression and caused expansion of its expression domain. The ABF/ABRE transcription factors, which are positive mediators of abscisic acid signalling, activate PLAT1 promoter activity in transactivation assays and directly bind to the ABRE elements located in this promoter in electrophoretic mobility shift assays. This suggests that PLAT1 represents a novel downstream target of the abscisic acid signalling pathway. Thus, we showed that PLAT1 critically functions as positive regulator of abiotic stress tolerance, but also is involved in regulating plant growth, and thereby assigned a function to this previously uncharacterised PLAT domain protein. The functional data obtained for PLAT1 support that PLAT-plant-stress proteins in general could be promising targets for improving abiotic stress tolerance without yield penalty.
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Affiliation(s)
- Tae Kyung Hyun
- Institute of Plant Sciences, University of Graz, Graz, Austria
- Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, Korea
| | - Eric van der Graaff
- Institute of Plant Sciences, University of Graz, Graz, Austria
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Taastrup, Denmark
| | - Alfonso Albacete
- Institute of Plant Sciences, University of Graz, Graz, Austria
- Departamento de Nutrición Vegetal, CEBAS-CSIC, Campus Espinardo, Murcia, Spain
| | - Seung Hee Eom
- Institute of Plant Sciences, University of Graz, Graz, Austria
- Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, Korea
| | - Dominik K. Großkinsky
- Institute of Plant Sciences, University of Graz, Graz, Austria
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Taastrup, Denmark
| | - Hannah Böhm
- Institute of Plant Sciences, University of Graz, Graz, Austria
| | - Ursula Janschek
- Institute of Plant Sciences, University of Graz, Graz, Austria
| | - Yeonggil Rim
- Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, Korea
| | - Walid Wahid Ali
- Department of Pharmaceutical Biology, University of Würzburg, Würzburg, Germany
| | - Soo Young Kim
- Department of Molecular Biotechnology and Kumho Life Science Laboratory, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, Korea
| | - Thomas Roitsch
- Institute of Plant Sciences, University of Graz, Graz, Austria
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Taastrup, Denmark
- Global Change Research Centre, CzechGlobe AS CR, v.v.i., Drásov, Czech Republic
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Albacete A, Cantero-Navarro E, Balibrea ME, Großkinsky DK, de la Cruz González M, Martínez-Andújar C, Smigocki AC, Roitsch T, Pérez-Alfocea F. Hormonal and metabolic regulation of tomato fruit sink activity and yield under salinity. J Exp Bot 2014; 65:6081-95. [PMID: 25170099 PMCID: PMC4203140 DOI: 10.1093/jxb/eru347] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Salinization of water and soil has a negative impact on tomato (Solanum lycopersicum L.) productivity by reducing growth of sink organs and by inducing senescence in source leaves. It has been hypothesized that yield stability implies the maintenance or increase of sink activity in the reproductive structures, thus contributing to the transport of assimilates from the source leaves through changes in sucrolytic enzymes and their regulation by phytohormones. In this study, classical and functional physiological approaches have been integrated to study the influence of metabolic and hormonal factors on tomato fruit sink activity, growth, and yield: (i) exogenous hormones were applied to plants, and (ii) transgenic plants overexpressing the cell wall invertase (cwInv) gene CIN1 in the fruits and de novo cytokinin (CK) biosynthesis gene IPT in the roots were constructed. Although salinity reduces fruit growth, sink activity, and trans-zeatin (tZ) concentrations, it increases the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) during the actively growing period (25 days after anthesis). Indeed, exogenous application of the CK analogue kinetin to salinized actively growing fruits recovered sucrolytic activities (mainly cwInv and sucrose synthase), sink strength, and fruit weight, whereas the ethylene-releasing compound ethephon had a negative effect in equivalent non-stressed fruits. Fruit yield was increased by both the constitutive expression of CIN1 in the fruits (up to 4-fold) or IPT in the root (up to 30%), owing to an increase in the fruit number (lower flower abortion) and in fruit weight. This is possibly related to a recovery of sink activity in reproductive tissues due to both (i) increase in sucrolytic activities (cwInv, sucrose synthase, and vacuolar and cytoplasmic invertases) and tZ concentration, and (ii) a decrease in the ACC levels and the activity of the invertase inhibitor. This study provides new functional evidences about the role of metabolic and hormonal inter-regulation of local sink processes in controlling tomato fruit sink activity, growth, and yield under salinity.
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Affiliation(s)
- Alfonso Albacete
- Department of Plant Nutrition, CEBAS-CSIC, Campus de Espinardo, 30100 Murcia, Spain Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria
| | | | - María E Balibrea
- Department of Plant Nutrition, CEBAS-CSIC, Campus de Espinardo, 30100 Murcia, Spain
| | - Dominik K Großkinsky
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, DK-2630 Taastrup, Denmark
| | | | | | - Ann C Smigocki
- Molecular Plant Pathology Laboratory, USDA, ARS, Beltsville, MD 20705, USA
| | - Thomas Roitsch
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, DK-2630 Taastrup, Denmark Global Change Research Centre, Czech Globe AS CR, v.v.i., Drásov 470, Cz-664 24 Drásov, Czech Republic
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47
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Großkinsky DK, Albacete A, Jammer A, Krbez P, van der Graaff E, Pfeifhofer H, Roitsch T. A rapid phytohormone and phytoalexin screening method for physiological phenotyping. Mol Plant 2014; 7:1053-1056. [PMID: 24503160 DOI: 10.1093/mp/ssu015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Affiliation(s)
- Dominik K Großkinsky
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, Graz 8010, Austria; Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, Taastrup 2630, Denmark.
| | - Alfonso Albacete
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, Graz 8010, Austria; Department of Plant Nutrition, CEBAS-CSIC, Campus de Espinardo, Murcia 30100, Spain
| | - Alexandra Jammer
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, Graz 8010, Austria
| | - Peter Krbez
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, Graz 8010, Austria
| | - Eric van der Graaff
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, Graz 8010, Austria
| | - Hartwig Pfeifhofer
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, Graz 8010, Austria
| | - Thomas Roitsch
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, Graz 8010, Austria; Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, Taastrup 2630, Denmark; Global Change Research Centre, Czech Globe AS CR, v.v.i.., Drásov 470, 664 24 Drásov, Czech Republic
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Großkinsky D, Edelsbrunner K, Pfeifhofer H, van der Graaff E, Roitsch T. Cis- and trans-zeatin differentially modulate plant immunity. Plant Signal Behav 2013; 8:e24798. [PMID: 23656869 PMCID: PMC3906432 DOI: 10.4161/psb.24798] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 04/24/2013] [Accepted: 04/24/2013] [Indexed: 05/13/2023]
Abstract
Phytohormones are essential regulators of various processes in plant growth and development. Several phytohormones are also known to regulate plant responses to environmental stress and pathogens. Only recently, cytokinins have been demonstrated to play an important role in plant immunity. Increased levels of cytokinins such as trans-zeatin, which are considered highly active, induced resistance against mainly (hemi)biotrophic pathogens in different plant species. In contrast, cis-zeatin is commonly regarded as a cytokinin exhibiting low or no activity. Here we comparatively study the impact of both zeatin isomers on the infection of Nicotiana tabacum by the (hemi)biotrophic microbial pathogen Pseudomonas syringae. We demonstrate a biological effect of cis-zeatin and a differential effect of the two zeatin isomers on symptom development, defense responses and bacterial multiplication.
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Affiliation(s)
- Dominik Großkinsky
- Department of Plant Physiology; Institute of Plant Sciences; University of Graz; Graz, Austria
| | - Kerstin Edelsbrunner
- Department of Plant Physiology; Institute of Plant Sciences; University of Graz; Graz, Austria
| | - Hartwig Pfeifhofer
- Department of Plant Physiology; Institute of Plant Sciences; University of Graz; Graz, Austria
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Großkinsky DK, van der Graaff E, Roitsch T. Phytoalexin transgenics in crop protection--fairy tale with a happy end? Plant Sci 2012; 195:54-70. [PMID: 22920999 DOI: 10.1016/j.plantsci.2012.06.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Revised: 06/14/2012] [Accepted: 06/14/2012] [Indexed: 05/19/2023]
Abstract
Phytoalexins are pathogen induced low molecular weight compounds with antimicrobial activities derived from secondary metabolism. Following their identification, phytoalexins were directly incorporated into the network of plant defense responses. Due to their heterogeneity, the metabolic pathways involved in phytoalexin formation and in particular the regulatory mechanisms remained elusive. Consequently, research focus shifted to the characterization of other components of plant immunity such as defense signaling and resistance mechanisms, including components of systemic acquired and induced systemic resistance, effector and pathogen-associated molecular pattern triggered immunity as well as R-gene resistance. Despite the obtained knowledge on these immunity mechanisms, genetic engineering employing these mechanisms and classical breeding reached too low improvements in crop protection, probably because classical breeding focused on yield performance and taste, rather than pathogen resistance. The increasing demand for disease resistant crop species and the aim to reduce pesticide application therefore requires alternative approaches. Recent advances in the understanding of phytoalexin function, biosynthesis and regulation, in combination with novel methods of molecular engineering and advances in instrumental analysis, returned attention to phytoalexins as a potent target for improving crop protection. Based on this, the advantages as well as potential bottlenecks for molecular approaches of modulating inducible phytoalexins to improve crop protection are discussed.
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Affiliation(s)
- Dominik K Großkinsky
- Institute of Plant Sciences, Department of Plant Physiology, University of Graz, Schubertstraße 51, 8010 Graz, Austria.
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