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Khan GA, Dutta A, van de Meene A, Frandsen KEH, Ogden M, Whelan J, Persson S. Phosphate starvation regulates cellulose synthesis to modify root growth. PLANT PHYSIOLOGY 2024; 194:1204-1217. [PMID: 37823515 PMCID: PMC10828208 DOI: 10.1093/plphys/kiad543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 09/15/2023] [Accepted: 09/24/2023] [Indexed: 10/13/2023]
Abstract
In the model plant Arabidopsis (Arabidopsis thaliana), the absence of the essential macro-nutrient phosphate reduces primary root growth through decreased cell division and elongation, requiring alterations to the polysaccharide-rich cell wall surrounding the cells. Despite its importance, the regulation of cell wall synthesis in response to low phosphate levels is not well understood. In this study, we show that plants increase cellulose synthesis in roots under limiting phosphate conditions, which leads to changes in the thickness and structure of the cell wall. These changes contribute to the reduced growth of primary roots in low-phosphate conditions. Furthermore, we found that the cellulose synthase complex (CSC) activity at the plasma membrane increases during phosphate deficiency. Moreover, we show that this increase in the activity of the CSC is likely due to alterations in the phosphorylation status of cellulose synthases in low-phosphate conditions. Specifically, phosphorylation of CELLULOSE SYNTHASE 1 (CESA1) at the S688 site decreases in low-phosphate conditions. Phosphomimic versions of CESA1 with an S688E mutation showed significantly reduced cellulose induction and primary root length changes in low-phosphate conditions. Protein structure modeling suggests that the phosphorylation status of S688 in CESA1 could play a role in stabilizing and activating the CSC. This mechanistic understanding of root growth regulation under limiting phosphate conditions provides potential strategies for changing root responses to soil phosphate content.
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Affiliation(s)
- Ghazanfar Abbas Khan
- Department of Animal, Plant and Soil Sciences, School of Agriculture, Biomedicine and Environment, La Trobe University, Bundoora, VIC 3086, Australia
| | - Arka Dutta
- Department of Animal, Plant and Soil Sciences, School of Agriculture, Biomedicine and Environment, La Trobe University, Bundoora, VIC 3086, Australia
| | | | - Kristian E H Frandsen
- Copenhagen Plant Science Center, Department of Plant & Environmental Sciences, University of Copenhagen, Frederiksberg C 1871, Denmark
| | - Michael Ogden
- Copenhagen Plant Science Center, Department of Plant & Environmental Sciences, University of Copenhagen, Frederiksberg C 1871, Denmark
| | - James Whelan
- Department of Animal, Plant and Soil Sciences, School of Agriculture, Biomedicine and Environment, La Trobe University, Bundoora, VIC 3086, Australia
- College of Life Science, Zhejiang University, Hangzhou 310058, China
| | - Staffan Persson
- School of Biosciences, University of Melbourne, Parkville, VIC 3010, Australia
- Copenhagen Plant Science Center, Department of Plant & Environmental Sciences, University of Copenhagen, Frederiksberg C 1871, Denmark
- Joint International Research Laboratory of Metabolic and Developmental Sciences, State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 20040, China
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2
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Lazcano-Ramírez HG, Gamboa-Becerra R, García-López IJ, Montes RAC, Díaz-Ramírez D, de la Vega OM, Ordaz-Ortíz JJ, de Folter S, Tiessen-Favier A, Winkler R, Marsch-Martínez N. Effects of the Developmental Regulator BOLITA on the Plant Metabolome. Genes (Basel) 2021; 12:genes12070995. [PMID: 34209960 PMCID: PMC8305173 DOI: 10.3390/genes12070995] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/22/2021] [Accepted: 06/24/2021] [Indexed: 12/13/2022] Open
Abstract
Transcription factors are important regulators of gene expression. They can orchestrate the activation or repression of hundreds or thousands of genes and control diverse processes in a coordinated way. This work explores the effect of a master regulator of plant development, BOLITA (BOL), in plant metabolism, with a special focus on specialized metabolism. For this, we used an Arabidopsis thaliana line in which the transcription factor activity can be induced. Fingerprinting metabolomic analyses of whole plantlets were performed at different times after induction. After 96 h, all induced replicas clustered as a single group, in contrast with all controls which did not cluster. Metabolomic analyses of shoot and root tissues enabled the putative identification of differentially accumulated metabolites in each tissue. Finally, the analysis of global gene expression in induced vs. non-induced root samples, together with enrichment analyses, allowed the identification of enriched metabolic pathways among the differentially expressed genes and accumulated metabolites after the induction. We concluded that the induction of BOL activity can modify the Arabidopsis metabolome. Future work should investigate whether its action is direct or indirect, and the implications of the metabolic changes for development regulation and bioprospection.
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Affiliation(s)
- Hugo Gerardo Lazcano-Ramírez
- Cell Identity Laboratory, Biotechnology and Biochemistry Department, CINVESTAV-IPN Irapuato Unit, Irapuato 36824, Mexico; (H.G.L.-R.); (D.D.-R.)
| | - Roberto Gamboa-Becerra
- Laboratory of Biochemical and Instrumental Analysis, Biotechnology and Biochemistry Department, CINVESTAV-IPN Irapuato Unit, Irapuato 36824, Mexico;
- Red de Biodiversidad y Sistemática, Instituto de Ecología A.C. Carretera Antigua a Coatepec 351, El Haya, Xalapa, Veracruz 91073, Mexico
| | - Irving J. García-López
- Genetic Engineering Department, CINVESTAV-IPN Irapuato Unit, Irapuato 36824, Mexico; (I.J.G.-L.); (A.T.-F.)
| | - Ricardo A. Chávez Montes
- Advanced Genomics Unit (UGA-Langebio), CINVESTAV-IPN, Irapuato 36824, Mexico; (R.A.C.M.); (O.M.d.l.V.); (J.J.O.-O.); (S.d.F.)
- Institute of Genomics for Crop Abiotic Stress Tolerance, Texas Tech University, Lubbock, TX 79409, USA
| | - David Díaz-Ramírez
- Cell Identity Laboratory, Biotechnology and Biochemistry Department, CINVESTAV-IPN Irapuato Unit, Irapuato 36824, Mexico; (H.G.L.-R.); (D.D.-R.)
| | - Octavio Martínez de la Vega
- Advanced Genomics Unit (UGA-Langebio), CINVESTAV-IPN, Irapuato 36824, Mexico; (R.A.C.M.); (O.M.d.l.V.); (J.J.O.-O.); (S.d.F.)
| | - José Juan Ordaz-Ortíz
- Advanced Genomics Unit (UGA-Langebio), CINVESTAV-IPN, Irapuato 36824, Mexico; (R.A.C.M.); (O.M.d.l.V.); (J.J.O.-O.); (S.d.F.)
| | - Stefan de Folter
- Advanced Genomics Unit (UGA-Langebio), CINVESTAV-IPN, Irapuato 36824, Mexico; (R.A.C.M.); (O.M.d.l.V.); (J.J.O.-O.); (S.d.F.)
| | - Axel Tiessen-Favier
- Genetic Engineering Department, CINVESTAV-IPN Irapuato Unit, Irapuato 36824, Mexico; (I.J.G.-L.); (A.T.-F.)
| | - Robert Winkler
- Laboratory of Biochemical and Instrumental Analysis, Biotechnology and Biochemistry Department, CINVESTAV-IPN Irapuato Unit, Irapuato 36824, Mexico;
- Correspondence: (R.W.); (N.M.-M.); Tel.: +52-(462)-623-9635 (R.W.); +52-462-623-9671 (N.M.-M.)
| | - Nayelli Marsch-Martínez
- Cell Identity Laboratory, Biotechnology and Biochemistry Department, CINVESTAV-IPN Irapuato Unit, Irapuato 36824, Mexico; (H.G.L.-R.); (D.D.-R.)
- Correspondence: (R.W.); (N.M.-M.); Tel.: +52-(462)-623-9635 (R.W.); +52-462-623-9671 (N.M.-M.)
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3
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Koschmieder J, Wüst F, Schaub P, Álvarez D, Trautmann D, Krischke M, Rustenholz C, Mano J, Mueller MJ, Bartels D, Hugueney P, Beyer P, Welsch R. Plant apocarotenoid metabolism utilizes defense mechanisms against reactive carbonyl species and xenobiotics. PLANT PHYSIOLOGY 2021; 185:331-351. [PMID: 33721895 PMCID: PMC8133636 DOI: 10.1093/plphys/kiaa033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 11/08/2020] [Indexed: 06/12/2023]
Abstract
Carotenoid levels in plant tissues depend on the relative rates of synthesis and degradation of the molecules in the pathway. While plant carotenoid biosynthesis has been extensively characterized, research on carotenoid degradation and catabolism into apocarotenoids is a relatively novel field. To identify apocarotenoid metabolic processes, we characterized the transcriptome of transgenic Arabidopsis (Arabidopsis thaliana) roots accumulating high levels of β-carotene and, consequently, β-apocarotenoids. Transcriptome analysis revealed feedback regulation on carotenogenic gene transcripts suitable for reducing β-carotene levels, suggesting involvement of specific apocarotenoid signaling molecules originating directly from β-carotene degradation or after secondary enzymatic derivatizations. Enzymes implicated in apocarotenoid modification reactions overlapped with detoxification enzymes of xenobiotics and reactive carbonyl species (RCS), while metabolite analysis excluded lipid stress response, a potential secondary effect of carotenoid accumulation. In agreement with structural similarities between RCS and β-apocarotenoids, RCS detoxification enzymes also converted apocarotenoids derived from β-carotene and from xanthophylls into apocarotenols and apocarotenoic acids in vitro. Moreover, glycosylation and glutathionylation-related processes and translocators were induced. In view of similarities to mechanisms found in crocin biosynthesis and cellular deposition in saffron (Crocus sativus), our data suggest apocarotenoid metabolization, derivatization and compartmentalization as key processes in (apo)carotenoid metabolism in plants.
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Affiliation(s)
| | - Florian Wüst
- Faculty of Biology II, University of Freiburg, 79104 Freiburg, Germany
| | - Patrick Schaub
- Faculty of Biology II, University of Freiburg, 79104 Freiburg, Germany
| | - Daniel Álvarez
- Faculty of Biology II, University of Freiburg, 79104 Freiburg, Germany
| | - Danika Trautmann
- Faculty of Biology II, University of Freiburg, 79104 Freiburg, Germany
- Université de Strasbourg, INRAE, SVQV UMR-A 1131, F-68000 Colmar, France
| | - Markus Krischke
- Julius-Maximilians-University Würzburg, Julius-von-Sachs-Institute for Biosciences, Julius-von-Sachs-Platz 2, 97082 Würzburg, Germany
| | - Camille Rustenholz
- Université de Strasbourg, INRAE, SVQV UMR-A 1131, F-68000 Colmar, France
| | - Jun’ichi Mano
- Science Research Center, Organization for Research Initiatives, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8515, Japan
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8515, Japan
| | - Martin J Mueller
- Université de Strasbourg, INRAE, SVQV UMR-A 1131, F-68000 Colmar, France
| | - Dorothea Bartels
- Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, Kirschallee 1, 53115 Bonn, Germany
| | - Philippe Hugueney
- Julius-Maximilians-University Würzburg, Julius-von-Sachs-Institute for Biosciences, Julius-von-Sachs-Platz 2, 97082 Würzburg, Germany
| | - Peter Beyer
- Faculty of Biology II, University of Freiburg, 79104 Freiburg, Germany
| | - Ralf Welsch
- Faculty of Biology II, University of Freiburg, 79104 Freiburg, Germany
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Salem MA, Giavalisco P. Mutation in the Arabidopsis regulatory-associated protein TOR 1B ( RAPTOR1B) leads to decreased jasmonates levels in leaf tissue. PLANT SIGNALING & BEHAVIOR 2019; 14:e1649567. [PMID: 31382813 PMCID: PMC6768200 DOI: 10.1080/15592324.2019.1649567] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 07/20/2019] [Accepted: 07/24/2019] [Indexed: 06/01/2023]
Abstract
The Target of Rapamycin (TOR) complex (TORC) regulates plant growth and development by modulation of metabolism in response to environmental cues. TORC contains in its core the TOR kinase and two interacting partners, namely; regulatory-associated partner of TOR (RAPTOR) and lethal with sec thirteen protein 8 (LST8). RAPTOR is described to act as a scaffold protein which recruits substrates for phosphorylation to the TOR kinase. In the current manuscript we show that mutation of Arabidopsis RAPTOR1B leads to significantly decreased levels of free jasmonic acid (JA), jasmonoyl-(L)-isoleucine (JA-Ile) as well as its biosynthetic precursor 12-oxo-phytodienoic acid (OPDA). Although raptor1b leaves showed decreased basic JA level compared to WT, the mutant responded substantially to wounding stress by producing the same amount of JA as WT. Furthermore, we could show that the chemical inhibition of TOR by AZD-8055 led to an opposite response. AZD-treated WT and raptor1b leaves accumulated high JA levels. These results strongly imply that the TOR signaling pathway is responding differentially to the inhibition of the TOR kinase as compared to the inhibition of the scaffold protein RAPTOR.
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Affiliation(s)
- Mohamed A. Salem
- Department of Pharmacognosy, Faculty of Pharmacy, Menoufia University, Shibin Elkom, Egypt
- Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany
| | - Patrick Giavalisco
- Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany
- Max Planck Institute for Biology of Ageing, Cologne, Germany
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5
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Gil-Monreal M, Fernandez-Escalada M, Royuela M, Zabalza A. An aerated axenic hydroponic system for the application of root treatments: exogenous pyruvate as a practical case. PLANT METHODS 2018; 14:48. [PMID: 29942345 PMCID: PMC5998518 DOI: 10.1186/s13007-018-0310-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 05/28/2018] [Indexed: 05/28/2023]
Abstract
BACKGROUND Hydroponic systems are a convenient platform for plant cultivation when treatments are applied to the roots because they provide precise control of the composition of the growth medium, ensuring the availability of different compounds. A problem arises when axenic conditions are needed but the treatment of choice (exogenous organic acids or sugars) promote the growth of unwanted microorganisms. Moreover, axenic conditions are usually applied in liquid and semi-liquid growing systems, where oxygen availability can be compromised, if no aeration is provided. RESULTS The driver for the development of this hydroponic system was the application of the organic acid pyruvate to the roots of plants grown under aerated axenic conditions. No contamination was detected in the nutrient solution, even after the addition of pyruvate. The system was validated in pea plants treated with either pyruvate or herbicides inhibiting amino acid biosynthesis. The effects on ethanol fermentation were compared by analysing the enzymatic activity, protein content and transcriptional levels in plants treated with either pyruvate or herbicides. CONCLUSIONS The developed system enables the study of the exogenous application of organic acids in the nutrient solution under axenic conditions and without oxygen limitation. This system allows the study of the effect of any type of treatments applied to roots under aerated axenic hydroponic systems at physiological and molecular levels. The role of pyruvate in the induction of fermentation by herbicides cannot be simply explained by an increase in substrate availability.
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Affiliation(s)
- Miriam Gil-Monreal
- Departamento Ciencias del Medio Natural, Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain
| | - Manuel Fernandez-Escalada
- Departamento Ciencias del Medio Natural, Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain
| | - Mercedes Royuela
- Departamento Ciencias del Medio Natural, Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain
| | - Ana Zabalza
- Departamento Ciencias del Medio Natural, Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain
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6
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Benzle K, Cornish K. Improved axenic hydroponic whole plant propagation for rapid production of roots as transformation target tissue. PLANT METHODS 2017; 13:37. [PMID: 28523073 PMCID: PMC5434549 DOI: 10.1186/s13007-017-0189-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 05/06/2017] [Indexed: 06/01/2023]
Abstract
BACKGROUND Plant roots are used as an efficient target tissue for plant transformation assays. In root propagable species transformed roots are able to regenerate into whole plants without the addition of exogenous hormones, thus avoiding somaclonal variation associated with many plant transformation protocols. Plants grown in soil or soilless solid medium have roots that tend to be extremely delicate and are difficult to sterilize in advance of plant transformation experiments. Axenic tissue culture plants grown on semi-solid media are slow to produce large amounts of biomass compared to plants grown in solution-based media. METHODS Seeds were germinated and grown for 14 days on half-strength semi-solid Murashige and Skoog medium containing 1% sucrose. Seedlings were then transferred to Magenta™ GA7 vessels containing either liquid or semi-solid ½ MS medium with 0.25, 0.5, 1, 2 or 3% sucrose. In the hydroponics (liquid medium) treatments, expanded clay balls were used to anchor seedlings. Hydroponic vessels were fitted with a sterile air aeration hose and filled ¾ full (100 mL) with liquid ½ MS media. Liquid media were replaced after 7 days. All plants were grown under fluorescent lights for 14 days. RESULTS We have developed an improved axenic hydroponic propagation system for producing large quantities of plant roots for use in transformation assays using Taraxacum kok-saghyz as a model for root propagable species. Plants grew significantly faster in liquid media than on solid media. Addition of sucrose from 0.25 to 2% was correlated with an increase in biomass accumulation in plants grown in liquid media. CONCLUSIONS Our improved axenic hydroponic method yields sufficient quantities of roots for extensive plant transformation/molecular studies.
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Affiliation(s)
- Kyle Benzle
- Department of Horticulture and Crop Science, The Ohio State University, 1680 Madison Avenue, Wooster, OH USA
| | - Katrina Cornish
- Department of Horticulture and Crop Science, The Ohio State University, 1680 Madison Avenue, Wooster, OH USA
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7
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Kohan-Baghkheirati E, Geisler-Lee J. Gene Expression, Protein Function and Pathways of Arabidopsis thaliana Responding to Silver Nanoparticles in Comparison to Silver Ions, Cold, Salt, Drought, and Heat. NANOMATERIALS (BASEL, SWITZERLAND) 2015; 5:436-467. [PMID: 28347022 PMCID: PMC5312895 DOI: 10.3390/nano5020436] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 03/18/2015] [Accepted: 03/23/2015] [Indexed: 12/14/2022]
Abstract
Silver nanoparticles (AgNPs) have been widely used in industry due to their unique physical and chemical properties. However, AgNPs have caused environmental concerns. To understand the risks of AgNPs, Arabidopsis microarray data for AgNP, Ag⁺, cold, salt, heat and drought stresses were analyzed. Up- and down-regulated genes of more than two-fold expression change were compared, while the encoded proteins of shared and unique genes between stresses were subjected to differential enrichment analyses. AgNPs affected the fewest genes (575) in the Arabidopsis genome, followed by Ag⁺ (1010), heat (1374), drought (1435), salt (4133) and cold (6536). More genes were up-regulated than down-regulated in AgNPs and Ag⁺ (438 and 780, respectively) while cold down-regulated the most genes (4022). Responses to AgNPs were more similar to those of Ag⁺ (464 shared genes), cold (202), and salt (163) than to drought (50) or heat (30); the genes in the first four stresses were enriched with 32 PFAM domains and 44 InterPro protein classes. Moreover, 111 genes were unique in AgNPs and they were enriched in three biological functions: response to fungal infection, anion transport, and cell wall/plasma membrane related. Despite shared similarity to Ag⁺, cold and salt stresses, AgNPs are a new stressor to Arabidopsis.
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Affiliation(s)
- Eisa Kohan-Baghkheirati
- Department of Plant Biology, Southern Illinois University Carbondale, Carbondale, IL 62901, USA.
- Department of Biology, Golestan University, Gorgan 49138-15739, Iran.
| | - Jane Geisler-Lee
- Department of Plant Biology, Southern Illinois University Carbondale, Carbondale, IL 62901, USA.
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Wang Q, Sohrabi R, Tholl D. Analysis of diterpenes and triterpenes from plant foliage and roots. Methods Mol Biol 2014; 1153:149-59. [PMID: 24777795 DOI: 10.1007/978-1-4939-0606-2_10] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Terpene specialized metabolites exhibit multiple functions in plant-environment interactions and plant development. Molecular biologists investigating the biochemistry and molecular function of terpenes need to apply robust but yet sensitive analytical methods optimized and adapted to the structural diversity and often varying concentrations of terpene compounds in plant tissues. Here we present hands-on protocols for sample preparation and GC-MS or LC-MS/MS analysis of selected diterpene and triterpene hydrocarbons or oxygenated derivatives from roots and shoots of Arabidopsis and rice.
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Affiliation(s)
- Qiang Wang
- Department of Biological Sciences, Virginia Tech, 220 Ag Quad Lane, Blacksburg, VA, 24061, USA
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9
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Bajwa VS, Shukla MR, Sherif SM, Murch SJ, Saxena PK. Role of melatonin in alleviating cold stress in Arabidopsis thaliana. J Pineal Res 2014; 56:238-45. [PMID: 24350934 DOI: 10.1111/jpi.12115] [Citation(s) in RCA: 223] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2013] [Accepted: 12/13/2013] [Indexed: 12/19/2022]
Abstract
Melatonin (N-acetyl-5-methoxytryptamine) has been implicated in abiotic and biotic stress tolerance in plants. However, information on the effects of melatonin in cold-stress tolerance in vivo is limited. In this study, the effect of melatonin was investigated in the model plant Arabidopsis thaliana challenged with a cold stress at 4⁰C for 72 and 120 hr. Melatonin-treated plants (10 and 30 μm) had significantly higher fresh weight, primary root length, and shoot height compared with the nontreated plants. To aid in the understanding of the role of melatonin in alleviating cold stress, we investigated the effects of melatonin treatment on the expression of cold-related genes. Melatonin up-regulated the expression of C-repeat-binding factors (CBFs)/Drought Response Element Binding factors (DREBs), a cold-responsive gene, COR15a, a transcription factor involved in freezing and drought-stress tolerance CAMTA1 and transcription activators of reactive oxygen species (ROS)-related antioxidant genes, ZAT10 and ZAT12, following cold stress. The up-regulation of cold signaling genes by melatonin may stimulate the biosynthesis of cold-protecting compounds and contribute to the increased growth of plants treated with exogenous melatonin under cold stress.
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Affiliation(s)
- Vikramjit S Bajwa
- Department of Plant Agriculture, Gosling Research Institute for Plant Preservation, University of Guelph, Guelph, ON, Canada
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Vaughan MM, Wang Q, Webster FX, Kiemle D, Hong YJ, Tantillo DJ, Coates RM, Wray AT, Askew W, O’Donnell C, Tokuhisa JG, Tholl D. Formation of the unusual semivolatile diterpene rhizathalene by the Arabidopsis class I terpene synthase TPS08 in the root stele is involved in defense against belowground herbivory. THE PLANT CELL 2013; 25:1108-25. [PMID: 23512856 PMCID: PMC3634680 DOI: 10.1105/tpc.112.100057] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2012] [Revised: 01/13/2013] [Accepted: 03/01/2013] [Indexed: 05/20/2023]
Abstract
Secondary metabolites are major constituents of plant defense against herbivore attack. Relatively little is known about the cell type-specific formation and antiherbivore activities of secondary compounds in roots despite the substantial impact of root herbivory on plant performance and fitness. Here, we describe the constitutive formation of semivolatile diterpenes called rhizathalenes by the class I terpene synthase (TPS) 08 in roots of Arabidopsis thaliana. The primary enzymatic product of TPS08, rhizathalene A, which is produced from the substrate all-trans geranylgeranyl diphosphate, represents a so far unidentified class of tricyclic diterpene carbon skeletons with an unusual tricyclic spiro-hydrindane structure. Protein targeting and administration of stable isotope precursors indicate that rhizathalenes are biosynthesized in root leucoplasts. TPS08 expression is largely localized to the root stele, suggesting a centric and gradual release of its diterpene products into the peripheral root cell layers. We demonstrate that roots of Arabidopsis tps08 mutant plants, grown aeroponically and in potting substrate, are more susceptible to herbivory by the opportunistic root herbivore fungus gnat (Bradysia spp) and suffer substantial removal of peripheral tissue at larval feeding sites. Our work provides evidence for the in vivo role of semivolatile diterpene metabolites as local antifeedants in belowground direct defense against root-feeding insects.
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Affiliation(s)
- Martha M. Vaughan
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia 24061
| | - Qiang Wang
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia 24061
| | - Francis X. Webster
- Department of Chemistry, State University of New York–Environmental Science and Forestry, Syracuse, New York 13210
| | - Dave Kiemle
- Department of Chemistry, State University of New York–Environmental Science and Forestry, Syracuse, New York 13210
| | - Young J. Hong
- Department of Chemistry, University of California, Davis, California 95616
| | - Dean J. Tantillo
- Department of Chemistry, University of California, Davis, California 95616
| | - Robert M. Coates
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801
| | - Austin T. Wray
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia 24061
| | - Whitnee Askew
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia 24061
| | | | - James G. Tokuhisa
- Department of Horticulture, Virginia Tech, Blacksburg, Virginia 24061
| | - Dorothea Tholl
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia 24061
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Edwards MRA, Hetu MF, Columbus M, Silva A, Lefebvre DD. The effect of ethylene glycol on the phytovolatilization of 1,4-dioxane. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2011; 13:702-716. [PMID: 21972497 DOI: 10.1080/15226514.2010.525553] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Phytoremediation at contaminated sites is often complicated by the presence of more than one chemical However, the effects of common co-contaminants such as ethylene glycol on the phytoremediation of other chemicals, e.g., 1,4-dioxane, is not well understood. Field studies with DN34 poplar trees revealed a 28% decline in growth rate in response to 10 g/L ethylene glycol in the groundwater, thus indicating a significant and deleterious effect on tree viability, and likely, the plants' utility for phytoremediation. Thorough investigations using Arabidopsis thaliana, with its small size and rapid life cycle, indicated significant growth reduction at 10 g/L and complete inhibition of germination at 40 g/L ethylene glycol Ethylene glycol was almost as severe a stressor as the well characterized osmotic inhibitor, sorbitoL Watering potted trees with 10 g/L ethylene glycol reduced their growth by more than 50%, and similar results were observed in hydroponically grown poplar and willow trees. Under hydroponic conditions, 60 g/L ethylene glycol inhibited the phytovolatilization of l,4-dioxane by more than 80%, and all trees evapo-transpired 1,4-dioxane less efficiently than water. In fact, this efficiency differed between trees and the difference became more pronounced in the presence of ethylene glycol.
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Vaughan MM, Tholl D, Tokuhisa JG. An aeroponic culture system for the study of root herbivory on Arabidopsis thaliana. PLANT METHODS 2011; 7:5. [PMID: 21392399 PMCID: PMC3064660 DOI: 10.1186/1746-4811-7-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Accepted: 03/10/2011] [Indexed: 05/09/2023]
Abstract
BACKGROUND Plant defense against herbivory has been studied primarily in aerial tissues. However, complex defense mechanisms have evolved in all parts of the plant to combat herbivore attack and these mechanisms are likely to differ in the aerial and subterranean environment. Research investigating defense responses belowground has been hindered by experimental difficulties associated with the accessibility and quality of root tissue and the lack of bioassays using model plants with altered defense profiles. RESULTS We have developed an aeroponic culture system based on a calcined clay substrate that allows insect herbivores to feed on plant roots while providing easy recovery of the root tissue. The culture method was validated by a root-herbivore system developed for Arabidopsis thaliana and the herbivore Bradysia spp. (fungus gnat). Arabidopsis root mass obtained from aeroponically grown plants was comparable to that from other culture systems, and the plants were morphologically normal. Bradysia larvae caused considerable root damage resulting in reduced root biomass and water absorption. After feeding on the aeroponically grown root tissue, the larvae pupated and emerged as adults. Root damage of mature plants cultivated in aeroponic substrate was compared to that of Arabidopsis seedlings grown in potting mix. Seedlings were notably more susceptible to Bradysia feeding than mature plants and showed decreased overall growth and survival rates. CONCLUSIONS A root-herbivore system consisting of Arabidopsis thaliana and larvae of the opportunistic herbivore Bradysia spp. has been established that mimics herbivory in the rhizosphere. Bradysia infestation of Arabidopsis grown in this culture system significantly affects plant performance. The culture method will allow simple profiling and in vivo functional analysis of root defenses such as chemical defense metabolites that are released in response to belowground insect attack.
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Affiliation(s)
- Martha M Vaughan
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA 24061, USA
- USDA Agricultural Research Service Center for Medical, Agricultural and Veterinary Entomology, Chemistry Research Unit, Gainesville, FL 32608, USA
| | - Dorothea Tholl
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA 24061, USA
| | - James G Tokuhisa
- Department of Horticulture, Virginia Tech, Blacksburg, VA 24061, USA
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Dutta B, Kanani H, Quackenbush J, Klapa MI. Time-series integrated "omic" analyses to elucidate short-term stress-induced responses in plant liquid cultures. Biotechnol Bioeng 2008; 102:264-279. [PMID: 18958862 DOI: 10.1002/bit.22036] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The research that aims at furthering our understanding of plant primary metabolism has intensified during the last decade. The presented study validated a systems biology methodological framework for the analysis of stress-induced molecular interaction networks in the context of plant primary metabolism, as these are expressed during the first hours of the stress treatment. The framework involves the application of time-series integrated full-genome transcriptomic and polar metabolomic analyses on plant liquid cultures. The latter were selected as the model system for this type of analysis, because they provide a well-controlled growth environment, ensuring that the observed plant response is due only to the applied perturbation. An enhanced gas chromatography-mass spectrometry (GC-MS) metabolomic data correction strategy and a new algorithm for the significance analysis of time-series "omic" data are used to extract information about the plant's transcriptional and metabolic response to the applied stress from the acquired datasets; in this article, it is the first time that these are applied for the analysis of a large biological dataset from a complex eukaryotic system. The case-study involved Arabidopsis thaliana liquid cultures subjected for 30 h to elevated (1%) CO2 stress. The advantages and validity of the methodological framework are discussed in the context of the known A. thaliana or plant, in general, physiology under the particular stress. Of note, the ability of the methodology to capture dynamic aspects of the observed molecular response allowed for 9 and 24 h of treatment to be indicated as corresponding to shifts in both the transcriptional and metabolic activity; analysis of the pathways through which these activity changes are manifested provides insight to regulatory processes.
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Affiliation(s)
- Bhaskar Dutta
- Metabolic Engineering and Systems Biology Laboratory, Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, Maryland 20742
| | - Harin Kanani
- Metabolic Engineering and Systems Biology Laboratory, Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, Maryland 20742
| | - John Quackenbush
- Metabolic Engineering and Systems Biology Laboratory, Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, Maryland 20742.,The Institute for Genomic Research (TIGR), Rockville, Maryland 20850
| | - Maria I Klapa
- Metabolic Engineering and Systems Biology Laboratory, Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, Maryland 20742.,Metabolic Engineering and Systems Biology Laboratory, Institute of Chemical Engineering and High Temperature Chemical Processes (ICE-HT), Foundation for Research and Technology-Hellas (FORTH), GR-265 04 Patras, Greece
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Zabotina OA, van de Ven WTG, Freshour G, Drakakaki G, Cavalier D, Mouille G, Hahn MG, Keegstra K, Raikhel NV. Arabidopsis XXT5 gene encodes a putative alpha-1,6-xylosyltransferase that is involved in xyloglucan biosynthesis. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2008; 56:101-15. [PMID: 18557833 DOI: 10.1111/j.1365-313x.2008.03580.x] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The function of a putative xyloglucan xylosyltransferase from Arabidopsis thaliana (At1g74380; XXT5) was studied. The XXT5 gene is expressed in all plant tissues, with higher levels of expression in roots, stems and cauline leaves. A T-DNA insertion in the XXT5 gene generates a readily visible root hair phenotype (root hairs are shorter and form bubble-like extrusions at the tip), and also causes the alteration of the main root cellular morphology. Biochemical characterization of cell wall polysaccharides isolated from xxt5 mutant seedlings demonstrated decreased xyloglucan quantity and reduced glucan backbone substitution with xylosyl residues. Immunohistochemical analyses of xxt5 plants revealed a selective decrease in some xyloglucan epitopes, whereas the distribution patterns of epitopes characteristic for other cell wall polysaccharides remained undisturbed. Transformation of xxt5 plants with a 35S::HA-XXT5 construct resulted in complementation of the morphological, biochemical and immunological phenotypes, restoring xyloglucan content and composition to wild-type levels. These data provide evidence that XXT5 is a xyloglucan alpha-1,6-xylosyltransferase, and functions in the biosynthesis of xyloglucan.
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Affiliation(s)
- Olga A Zabotina
- Institute for Integrative Genome Biology, Center for Plant Cell Biology and Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA
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Lewsey M, Robertson FC, Canto T, Palukaitis P, Carr JP. Selective targeting of miRNA-regulated plant development by a viral counter-silencing protein. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2007; 50:240-52. [PMID: 17444907 DOI: 10.1111/j.1365-313x.2007.03042.x] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The cucumber mosaic virus (CMV) 2b protein suppresses RNA silencing and determines viral symptoms. Among Arabidopsis thaliana lines expressing 2b proteins from mild (LS and Q CMV) or severe (Fny CMV) strains, only Fny 2b-transgenic plants displayed strong symptom-like phenotypes in leaves, stems and flowers, together with stunting of main root growth and increased emergence of lateral roots. However, LS and Fny 2b proteins both enhanced lateral root length. Micro (mi)RNA-mediated cellular mRNA turnover was inhibited in Fny 2b-transgenic plants, but there was no evidence for this in LS 2b-transgenic plants. Both 2b proteins efficiently suppressed small interfering (si)RNA-mediated RNA silencing, suggesting that 2b proteins can target the siRNA pathway without disrupting miRNA-regulated RNA turnover. Thus, symptom induction is not an inevitable consequence of RNA silencing suppression. For CMV, strain-specific differences between the 2b silencing proteins determine whether only one or both small RNA-guided RNA destruction pathways are disrupted.
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Affiliation(s)
- Mathew Lewsey
- Department of Plant Sciences, Downing Street, Cambridge, UK
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