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Walsh C, Vanderburgh C, Grant L, Katz E, Kliebenstein DJ, Fierer N. Microbial terroir: associations between soil microbiomes and the flavor chemistry of mustard (Brassica juncea). THE NEW PHYTOLOGIST 2024; 243:1951-1965. [PMID: 38553428 DOI: 10.1111/nph.19708] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 03/05/2024] [Indexed: 08/02/2024]
Abstract
Here, we characterized the independent role of soil microbiomes (bacterial and fungal communities) in determining the flavor chemistry of harvested mustard seed (Brassica juncea). Given the known impacts of soil microbial communities on various plant characteristics, we hypothesized that differences in rhizosphere microbiomes would result in differences in seed flavor chemistry (glucosinolate content). In a glasshouse study, we introduced distinct soil microbial communities to mustard plants growing in an otherwise consistent environment. At the end of the plant life cycle, we characterized the rhizosphere and root microbiomes and harvested produced mustard seeds for chemical characterization. Specifically, we measured the concentrations of glucosinolates, secondary metabolites known to create spicy and bitter flavors. We examined associations between rhizosphere microbial taxa or genes and seed flavor chemistry. We identified links between the rhizosphere microbial community composition and the concentration of the main glucosinolate, allyl, in seeds. We further identified specific rhizosphere taxa predictive of seed allyl concentration and identified bacterial functional genes, namely genes for sulfur metabolism, which could partly explain the observed associations. Together, this work offers insight into the potential influence of the belowground microbiome on the flavor of harvested crops.
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Affiliation(s)
- Corinne Walsh
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, 80309, USA
- Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, CO, 80309, USA
| | - Caihong Vanderburgh
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, 80309, USA
| | - Lady Grant
- Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO, 80523, USA
| | - Ella Katz
- Department of Plant Sciences, University of California Davis, Davis, CA, 95616, USA
| | | | - Noah Fierer
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, 80309, USA
- Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, CO, 80309, USA
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Zhang X, Zhang G, Yan Q, Ahmad B, Pei J, Huang L. Quality variation and salt-alkali-tolerance mechanism of Cynomorium songaricum: Interacting from microbiome-transcriptome-metabolome. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 919:170801. [PMID: 38340858 DOI: 10.1016/j.scitotenv.2024.170801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/22/2024] [Accepted: 02/06/2024] [Indexed: 02/12/2024]
Abstract
Addressing soil salinization and implementing sustainable practices for cultivating cash crops on saline-alkali land is a prominent global challenge. Cynomorium songaricum is an important salt-alkali tolerant medicinal plant capable of adapting to saline-alkali environments. In this study, two typical ecotypes of C. songaricum from the desert-steppe (DS) and saline-alkali land (SAL) habitats were selected. Through the integration of multi-omics with machine learning, the rhizosphere microbial communities, genetic maps, and metabolic profiles of two ecotypes were created and the crucial factors for the adaptation of C. songaricum to saline-alkali stress were identified, including 7 keystone OTUs (i.e. Novosphingobium sp., Sinorhizobium meliloti, and Glycomyces sp.), 5 core genes (cell wall-related genes), and 10 most important metabolites (i.e. cucurbitacin D and 3-Hydroxybutyrate) were identified. Our results indicated that under saline-alkali environments, the microbial competition might become more intense, and the microbial community network had the simple but stable structure, accompanied by the changes in the gene expression related to cell wall for adaptation. However, this regulation led to the reduction in active ingredients, such as the accumulation of flavonoids and organic acid, and enhanced the synthesis of bitter substances (cucurbitacin D), resulting in the decrease in the quality of C. songaricum. Therefore, compared to the SAL ecotype, the DS was more suitable for the subsequent development of medicinal and edible products of C. songaricum. Furthermore, to explore the reasons for this quality variation, we constructed a comprehensive microbial-genetic-metabolic regulatory network, revealing that the metabolism of C. songaricum was primarily influenced by genetic factors. These findings not only offer new insights for future research into plant salt-alkali tolerance strategies but also provide a crucial understanding for cultivating high-quality medicinal plants.
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Affiliation(s)
- Xinke Zhang
- Key lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100193, China
| | - Guoshuai Zhang
- Key lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100193, China
| | - Qi Yan
- Key lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100193, China
| | - Bashir Ahmad
- Center for Biotechnology & Microbiology, University of Peshawar, 25000 Peshawar, Pakistan
| | - Jin Pei
- State Key Laboratory of Southwestern Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan 611137, China.
| | - Linfang Huang
- Key lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100193, China.
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Zheng Z, Hu J, He T, Liu C, Zhou X, Yin D. Suppression of mercury methylation in soil and methylmercury accumulation in rice by dissolved organic matter derived from sulfur-rich rape straw. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 346:123657. [PMID: 38428787 DOI: 10.1016/j.envpol.2024.123657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/09/2024] [Accepted: 02/24/2024] [Indexed: 03/03/2024]
Abstract
Straw amendment significantly enhances mercury (Hg) methylation and subsequent methylmercury (MeHg) bioaccumulation in Hg-contaminated paddy fields by releasing dissolved organic matter (DOM). This study comprehensively investigates the regulatory mechanisms of DOM and its different molecular weights derived from sulfur-rich rape straw (RaDOM) and composted rape straw (CRaDOM) applied in the rice-filling stage on soil MeHg production and subsequent bioaccumulation in rice grains. The results indicated that the amendment of RaDOM and CRaDOM significantly reduced soil MeHg content by 42.40-62.42%. This reduction can be attributed to several factors, including the suppression of Hg-methylating bacteria in soil, the supply of sulfate from RaDOM and CRaDOM, and the increase in the humification, molecular weight, and humic-like fractions of soil DOM. Additionally, adding RaDOM increased the MeHg bioaccumulation factor in roots by 27.55% while inhibiting MeHg transportation by 12.24% and ultimately reducing MeHg content in grains by 21.24% compared to the control group. Similarly, CRaDOM enhanced MeHg accumulation by 25.19%, suppressed MeHg transportation by 39.65%, and reduced MeHg levels in the grains by 27.94%. The assimilation of sulfate derived from RaDOM and CRaDOM into glutathione may be responsible for the increased retention of MeHg in the roots. Over the three days, there was a significant decrease in soil MeHg content as the molecular weight of RaDOM increased; conversely, altering the molecular weight of CRaDOM demonstrated an inverse trend. However, this pattern was not observed after 12 days. Applying sulfur-rich rape DOM can help mitigate MeHg accumulation in paddy fields by regulating the quality of soil DOM, sulfur cycling, and Hg-methylating bacteria.
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Affiliation(s)
- Zhoujuan Zheng
- Key Laboratory of Karst Georesources and Environment (Guizhou University), Ministry of Education, Guiyang, 550025, China; College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China
| | - Jie Hu
- Key Laboratory of Karst Georesources and Environment (Guizhou University), Ministry of Education, Guiyang, 550025, China; College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China
| | - Tianrong He
- Key Laboratory of Karst Georesources and Environment (Guizhou University), Ministry of Education, Guiyang, 550025, China; College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China
| | - Chengbin Liu
- Institute for Agri-food Standards and Testing Technology, Shanghai Academy of Agricultural Sciences, Shanghai, 201403, China
| | - Xian Zhou
- College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China
| | - Deliang Yin
- Key Laboratory of Karst Georesources and Environment (Guizhou University), Ministry of Education, Guiyang, 550025, China; Guizhou Karst Environmental Ecosystems Observation and Research Station, Ministry of Education, Guiyang, 550025, China.
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Hartman K, Schmid MW, Bodenhausen N, Bender SF, Valzano-Held AY, Schlaeppi K, van der Heijden MGA. A symbiotic footprint in the plant root microbiome. ENVIRONMENTAL MICROBIOME 2023; 18:65. [PMID: 37525294 PMCID: PMC10391997 DOI: 10.1186/s40793-023-00521-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 07/14/2023] [Indexed: 08/02/2023]
Abstract
BACKGROUND A major aim in plant microbiome research is determining the drivers of plant-associated microbial communities. While soil characteristics and host plant identity present key drivers of root microbiome composition, it is still unresolved whether the presence or absence of important plant root symbionts also determines overall microbiome composition. Arbuscular mycorrhizal fungi (AMF) and N-fixing rhizobia bacteria are widespread, beneficial root symbionts that significantly enhance plant nutrition, plant health, and root structure. Thus, we hypothesized that symbiont types define the root microbiome structure. RESULTS We grew 17 plant species from five families differing in their symbiotic associations (no symbioses, AMF only, rhizobia only, or AMF and rhizobia) in a greenhouse and used bacterial and fungal amplicon sequencing to characterize their root microbiomes. Although plant phylogeny and species identity were the most important factors determining root microbiome composition, we discovered that the type of symbioses also presented a significant driver of diversity and community composition. We found consistent responses of bacterial phyla, including members of the Acidobacteria, Chlamydiae, Firmicutes, and Verrucomicrobia, to the presence or absence of AMF and rhizobia and identified communities of OTUs specifically enriched in the different symbiotic groups. A total of 80, 75 and 57 bacterial OTUs were specific for plant species without symbiosis, plant species forming associations with AMF or plant species associating with both AMF and rhizobia, respectively. Similarly, 9, 14 and 4 fungal OTUs were specific for these plant symbiont groups. Importantly, these generic symbiosis footprints in microbial community composition were also apparent in absence of the primary symbionts. CONCLUSION Our results reveal that symbiotic associations of the host plant leaves an imprint on the wider root microbiome - which we term the symbiotype. These findings suggest the existence of a fundamental assembly principle of root microbiomes, dependent on the symbiotic associations of the host plant.
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Affiliation(s)
- Kyle Hartman
- Department of Agroecology and Environment, Plant Soil Interactions, Reckenholzstrasse 191, Agroscope, Zürich, 8046, Switzerland
| | | | - Natacha Bodenhausen
- Department of Agroecology and Environment, Plant Soil Interactions, Reckenholzstrasse 191, Agroscope, Zürich, 8046, Switzerland
- Department of Soil Sciences, Research Institute of Organic Agriculture FiBL, Frick, 5070, Switzerland
| | - S Franz Bender
- Department of Agroecology and Environment, Plant Soil Interactions, Reckenholzstrasse 191, Agroscope, Zürich, 8046, Switzerland
| | - Alain Y Valzano-Held
- Department of Agroecology and Environment, Plant Soil Interactions, Reckenholzstrasse 191, Agroscope, Zürich, 8046, Switzerland
| | - Klaus Schlaeppi
- Department of Agroecology and Environment, Plant Soil Interactions, Reckenholzstrasse 191, Agroscope, Zürich, 8046, Switzerland.
- Plant Microbe Interactions, Department of Environmental Sciences, University of Basel, Basel, 4056, Switzerland.
- Institute of Plant Sciences, Faculty of Science, University of Bern, Bern, 3013, Switzerland.
| | - Marcel G A van der Heijden
- Department of Agroecology and Environment, Plant Soil Interactions, Reckenholzstrasse 191, Agroscope, Zürich, 8046, Switzerland.
- Department of Plant and Microbial Biology, University of Zürich, Zürich, 8008, Switzerland.
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Hofmann D, Thiele B, Siebers M, Rahmati M, Schütz V, Jeong S, Cui J, Bigler L, Held F, Wu B, Babic N, Kovacic F, Hamacher J, Hölzl G, Dörmann P, Schulz M. Implications of Below-Ground Allelopathic Interactions of Camelina sativa and Microorganisms for Phosphate Availability and Habitat Maintenance. PLANTS (BASEL, SWITZERLAND) 2023; 12:2815. [PMID: 37570969 PMCID: PMC10421311 DOI: 10.3390/plants12152815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/26/2023] [Accepted: 07/27/2023] [Indexed: 08/13/2023]
Abstract
Toxic breakdown products of young Camelina sativa (L.) Crantz, glucosinolates can eliminate microorganisms in the soil. Since microorganisms are essential for phosphate cycling, only insensitive microorganisms with phosphate-solubilizing activity can improve C. sativa's phosphate supply. In this study, 33P-labeled phosphate, inductively coupled plasma mass spectrometry and pot experiments unveiled that not only Trichoderma viride and Pseudomonas laurentiana used as phosphate-solubilizing inoculants, but also intrinsic soil microorganisms, including Penicillium aurantiogriseum, and the assemblies of root-colonizing microorganisms solubilized as well phosphate from apatite, trigger off competitive behavior between the organisms. Driving factors in the competitiveness are plant and microbial secondary metabolites, while glucosinolates of Camelina and their breakdown products are regarded as key compounds that inhibit the pathogen P. aurantiogriseum, but also seem to impede root colonization of T. viride. On the other hand, fungal diketopiperazine combined with glucosinolates is fatal to Camelina. The results may contribute to explain the contradictory effects of phosphate-solubilizing microorganisms when used as biofertilizers. Further studies will elucidate impacts of released secondary metabolites on coexisting microorganisms and plants under different environmental conditions.
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Affiliation(s)
- Diana Hofmann
- IBG-3: Agrosphäre, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany; (D.H.); (B.T.); (M.R.); (B.W.)
| | - Björn Thiele
- IBG-3: Agrosphäre, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany; (D.H.); (B.T.); (M.R.); (B.W.)
| | - Meike Siebers
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Mehdi Rahmati
- IBG-3: Agrosphäre, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany; (D.H.); (B.T.); (M.R.); (B.W.)
- Department of Soil Science and Engineering, University of Maragheh, Maragheh 83111-55181, Iran
| | - Vadim Schütz
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Seungwoo Jeong
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Jiaxin Cui
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Laurent Bigler
- Department of Chemistry, University of Zurich, CH-8057 Zurich, Switzerland; (L.B.); (F.H.)
| | - Federico Held
- Department of Chemistry, University of Zurich, CH-8057 Zurich, Switzerland; (L.B.); (F.H.)
| | - Bei Wu
- IBG-3: Agrosphäre, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany; (D.H.); (B.T.); (M.R.); (B.W.)
| | - Nikolina Babic
- Institute of Molecular Enzyme Technology, Heinrich-Heine-University of Düsseldorf and Forschungszentrum Jülich GmbH, 52428 Jülich, Germany (F.K.)
| | - Filip Kovacic
- Institute of Molecular Enzyme Technology, Heinrich-Heine-University of Düsseldorf and Forschungszentrum Jülich GmbH, 52428 Jülich, Germany (F.K.)
| | - Joachim Hamacher
- Plant Diseases and Crop Protection, Institute of Crop Science and Resource Conservation, University of Bonn, 53115 Bonn, Germany;
| | - Georg Hölzl
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Peter Dörmann
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Margot Schulz
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
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Sugiyama A. Application of plant specialized metabolites to modulate soil microbiota. PLANT BIOTECHNOLOGY (TOKYO, JAPAN) 2023; 40:123-133. [PMID: 38250293 PMCID: PMC10797516 DOI: 10.5511/plantbiotechnology.23.0227a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Accepted: 02/27/2023] [Indexed: 01/23/2024]
Abstract
Plant specialized metabolites (PSMs) are considerably diverse compounds with multifaceted roles in the adaptation of plants to various abiotic and biotic stresses. PSMs are frequently secreted into the rhizosphere, a small region around the roots, where they facilitate interactions between plants and soil microorganisms. PSMs shape the host-specific rhizosphere microbial communities that potentially influence plant growth and tolerance to adverse conditions. Plant mutants defective in PSM biosynthesis contribute to reveal the roles of each PSM in plant-microbiota interactions in the rhizosphere. Recently, various approaches have been used to directly supply PSMs to soil by in vitro methods or through addition in pots with plants. This review focuses on the feasibility of the direct PSM application methods to reveal rhizospheric plant-microbiota interactions and discusses the possibility of applying the knowledge gained to future engineering of rhizospheric traits.
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Affiliation(s)
- Akifumi Sugiyama
- Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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Tabaglio V, Fiorini A, Sterling TM, Schulz M. Abutilon theophrasti's Resilience against Allelochemical-Based Weed Management in Sustainable Agriculture - Due to Collection of Highly Advantageous Microorganisms? PLANTS (BASEL, SWITZERLAND) 2023; 12:700. [PMID: 36840048 PMCID: PMC9961861 DOI: 10.3390/plants12040700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/30/2023] [Accepted: 02/01/2023] [Indexed: 06/18/2023]
Abstract
Abutilon theophrasti Medik. (velvetleaf) is a problematic annual weed in field crops which has invaded many temperate parts of the world. Since the loss of crop yields can be extensive, approaches to manage the weed include not only conventional methods, but also biological methods, for instance by microorganisms releasing phytotoxins and plant-derived allelochemicals. Additionally, benzoxazinoid-rich rye mulches effective in managing common weeds like Amaranthus retroflexus L. have been tested for this purpose. However, recent methods for biological control are still unreliable in terms of intensity and duration. Rye mulches were also ineffective in managing velvetleaf. In this review, we present the attempts to reduce velvetleaf infestation by biological methods and discuss possible reasons for the failure. The resilience of velvetleaf may be due to the extraordinary capacity of the plant to collect, for its own survival, the most suitable microorganisms from a given farming site, genetic and epigenetic adaptations, and a high stress memory. Such properties may have developed together with other advantageous abilities during selection by humans when the plant was used as a crop. Rewilding could be responsible for improving the microbiomes of A. theophrasti.
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Affiliation(s)
- Vincenzo Tabaglio
- Department of Sustainable Crop Production DI.PRO.VE.S., Section Agronomy and Plant Biotechnologies, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, 29122 Piacenza, Italy
| | - Andrea Fiorini
- Department of Sustainable Crop Production DI.PRO.VE.S., Section Agronomy and Plant Biotechnologies, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, 29122 Piacenza, Italy
| | - Tracy M. Sterling
- Department of Land Resources & Environmental Sciences, Montana State University, Bozeman, MT 59717, USA
| | - Margot Schulz
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, Karlrobert-Kreiten Str. 13, 53115 Bonn, Germany
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Al-Rahbi BAA, Al-Sadi AM, Al-Harrasi MMA, Al-Sabahi JN, Al-Mahmooli IH, Blackburn D, Velazhahan R. Effectiveness of Endophytic and Rhizospheric Bacteria from Moringa spp. in Controlling Pythium aphanidermatum Damping-Off of Cabbage. PLANTS (BASEL, SWITZERLAND) 2023; 12:668. [PMID: 36771752 PMCID: PMC9919774 DOI: 10.3390/plants12030668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 01/24/2023] [Accepted: 01/30/2023] [Indexed: 06/18/2023]
Abstract
In this study, endophytic and rhizospheric bacteria were isolated from Moringa olifera and M. perigreina from Oman, and their in vitro antagonistic activity against Pythium aphanidermatum was tested using a dual culture assay. The promising strains were tested further for their compatibility and potential for plant growth promotion, biofilm formation, antifungal volatile organic compound (VOC) production, and the biological control of P. aphanidermatum damping-off of cabbage (Brassica oleracea L.) under greenhouse conditions. A total of 12 endophytic and 27 rhizospheric bacteria were isolated from Moringa spp. Among them, Bacillus pumilus MPE1 showed the maximum antagonistic activity against P. aphanidermatum in the dual culture assay, followed by Paenibacillus glucanolyticus MPE3 and Pseudomonas indica MOR3 and MOR8. These bacterial isolates induced abundant morphological abnormalities in the hyphae of P. aphanidermatum, as observed via scanning electron microscopy. The in vitro cross-streak assay showed that these bacterial isolates were compatible among themselves, except for P. indica MOR8 × P. glucanolyticus MPE3. These antagonists released VOCs that restricted the growth of P. aphanidermatum in an in vitro assay. These antagonistic bacteria released 2,4-dimethylheptane and 4-methyloctane as the predominant volatile compounds. Of the four antagonistic bacterial strains, P. indica MOR8 was capable of forming biofilm, which is considered a trait that improves the efficacy of rhizosphere inoculants. The results of the greenhouse experiments showed that the soil treatment with B. pumilus MPE1 showed the highest reduction (59%) in the incidence of P. aphanidermatum damping-off in cabbage, evidencing its potential as a biological control agent for the management of this disease. Further research is needed to characterize the antifungal traits and activities of B. pumilus MPE1 and to assert its potential use against other soil-borne plant pathogens.
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Affiliation(s)
- Buthaina Aamir Ali Al-Rahbi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman
| | - Abdullah Mohammed Al-Sadi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman
| | - Majida Mohammed Ali Al-Harrasi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman
| | - Jamal Nasser Al-Sabahi
- Central Instrumentation Laboratory, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman
| | - Issa Hashil Al-Mahmooli
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman
| | - Daniel Blackburn
- Department of Soil, Water and Agricultural Engineering, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman
| | - Rethinasamy Velazhahan
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman
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9
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LeBlanc N. Green Manures Alter Taxonomic and Functional Characteristics of Soil Bacterial Communities. MICROBIAL ECOLOGY 2023; 85:684-697. [PMID: 35112152 DOI: 10.1007/s00248-022-01975-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 01/25/2022] [Indexed: 06/14/2023]
Abstract
Incorporation of plant biomass into soil as green manures can reduce soilborne diseases and improve crop and soil health in agricultural ecosystems. Soil microbial communities can mediate beneficial effects of these amendments, but their response to different types of green manures is poorly understood. This study tested the effect of green manures from broccoli, marigold, and sudangrass on taxonomic and functional characteristics of soil bacterial communities. Green manures were amended to field soil and maintained in microcosms artificially infested with the soilborne plant pathogen Verticillium dahliae. Lettuce seedlings were transplanted into green manure amended and fallow soil and maintained under growth chamber conditions for 12 weeks. Bacterial communities in bulk and rhizosphere soils were characterized using nanopore sequencing of 16S rRNA and shotgun metagenome libraries. Under microcosm conditions, all green manures reduced the abundance of the soilborne plant pathogen V. dahliae and altered the taxonomic composition of bacterial communities. Twelve weeks following amendment, green manures had differential effects on lettuce yield as well as the taxonomic diversity and composition of soil bacterial communities. In addition, multiple green manures increased the abundance of bacterial functional traits in rhizosphere soil related to iron and polysaccharide acquisition and decreased the abundance of functional traits related to bacterial protein secretion systems. This study demonstrates green manures alter the taxonomic composition and functional traits in soil bacterial communities suggesting these changes may impact beneficial effects of green manures on plant and soil health.
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Affiliation(s)
- Nicholas LeBlanc
- United States Department of Agriculture, Agricultural Research Service, Crop Improvement and Protection Research Unit, 1636 E. Alisal St., Salinas, CA, 93905, USA.
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10
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Liu L, Zou G, Zuo Q, Li C, Gu J, Kang L, Ma M, Liang K, Liu D, Du L. Soil bacterial community and metabolism showed a more sensitive response to PBAT biodegradable mulch residues than that of LDPE mulch residues. JOURNAL OF HAZARDOUS MATERIALS 2022; 438:129507. [PMID: 35999736 DOI: 10.1016/j.jhazmat.2022.129507] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 06/28/2022] [Accepted: 06/29/2022] [Indexed: 06/15/2023]
Abstract
Biodegradable mulch film (BDM) is considered as an environmentally sustainable alternative to low density polyethylene (LDPE) mulch film. However, the low degradation rate of BDM resulted in residues in soil after service period which were similar to LDPE mulch film. Distinguishing the differential responses of crop growth, soil bacteria and metabolism to residues of BDM and LDPE mulch films is favourable for comparing the environmental toxicities of the two materials. The results indicated that emergence rate and yield of Chinese cabbage (Brassica campestris L. ssp. chinensis Makino) were significantly inhibited by two types mulch residues. BDM residues significantly decreased bacterial diversity by 1.2-2.3% through the enrichment of dominant phyla and inhibition of inferior phyla, while LDPE mulch residues not. The effects of BDM residues on soil metabolite spectrum were stronger than LDPE mulch residues with significant increase (3.9% 5.8%) in the abundance of total metabolites. Besides the pathways of metabolism, organismal systems, environmental information processing influenced by LDPE mulch resides, differential pathways including human diseases and cellular processes were also determined in soil with BDM residues. According to all the results of the present study, prior to the promotion of BDM, its influences on soil safety must be carefully investigated through critical and systematic research.
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Affiliation(s)
- Liyuan Liu
- Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100089, China
| | - Guoyuan Zou
- Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100089, China
| | - Qiang Zuo
- Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100089, China
| | - Chuanzong Li
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Qingdao, China
| | - Jialin Gu
- Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100089, China
| | - Lingyun Kang
- Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100089, China
| | - Maoting Ma
- Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100089, China
| | - Kengyu Liang
- Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100089, China
| | - Dongsheng Liu
- Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100089, China
| | - Lianfeng Du
- Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100089, China
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11
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Poveda J, Díaz-González S, Díaz-Urbano M, Velasco P, Sacristán S. Fungal endophytes of Brassicaceae: Molecular interactions and crop benefits. FRONTIERS IN PLANT SCIENCE 2022; 13:932288. [PMID: 35991403 PMCID: PMC9390090 DOI: 10.3389/fpls.2022.932288] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 07/04/2022] [Indexed: 06/15/2023]
Abstract
Brassicaceae family includes an important group of plants of great scientific interest, e.g., the model plant Arabidopsis thaliana, and of economic interest, such as crops of the genus Brassica (Brassica oleracea, Brassica napus, Brassica rapa, etc.). This group of plants is characterized by the synthesis and accumulation in their tissues of secondary metabolites called glucosinolates (GSLs), sulfur-containing compounds mainly involved in plant defense against pathogens and pests. Brassicaceae plants are among the 30% of plant species that cannot establish optimal associations with mycorrhizal hosts (together with other plant families such as Proteaceae, Chenopodiaceae, and Caryophyllaceae), and GSLs could be involved in this evolutionary process of non-interaction. However, this group of plants can establish beneficial interactions with endophytic fungi, which requires a reduction of defensive responses by the host plant and/or an evasion, tolerance, or suppression of plant defenses by the fungus. Although much remains to be known about the mechanisms involved in the Brassicaceae-endophyte fungal interaction, several cases have been described, in which the fungi need to interfere with the GSL synthesis and hydrolysis in the host plant, or even directly degrade GSLs before they are hydrolyzed to antifungal isothiocyanates. Once the Brassicaceae-endophyte fungus symbiosis is formed, the host plant can obtain important benefits from an agricultural point of view, such as plant growth promotion and increase in yield and quality, increased tolerance to abiotic stresses, and direct and indirect control of plant pests and diseases. This review compiles the studies on the interaction between endophytic fungi and Brassicaceae plants, discussing the mechanisms involved in the success of the symbiosis, together with the benefits obtained by these plants. Due to their unique characteristics, the family Brassicaceae can be seen as a fruitful source of novel beneficial endophytes with applications to crops, as well as to generate new models of study that allow us to better understand the interactions of these amazing fungi with plants.
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Affiliation(s)
- Jorge Poveda
- Institute for Multidisciplinary Research in Applied Biology (IMAB), Universidad Pública de Navarra (UPNA), Pamplona, Spain
| | - Sandra Díaz-González
- Centro de Biotecnología y Genómica de Plantas (CBGP, UPM-INIA/CSIC), Universidad Politécnica de Madrid (UPM), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA/CSIC), Madrid, Spain
| | - María Díaz-Urbano
- Group of Genetics, Breeding and Biochemistry of Brassicas, Misión Biológica de Galicia (MBG), Spanish National Research Council (CSIC), Pontevedra, Spain
| | - Pablo Velasco
- Group of Genetics, Breeding and Biochemistry of Brassicas, Misión Biológica de Galicia (MBG), Spanish National Research Council (CSIC), Pontevedra, Spain
| | - Soledad Sacristán
- Centro de Biotecnología y Genómica de Plantas (CBGP, UPM-INIA/CSIC), Universidad Politécnica de Madrid (UPM), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA/CSIC), Madrid, Spain
- Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid (UPM), Madrid, Spain
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12
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Bioactive Nitrosylated and Nitrated N-(2-hydroxyphenyl)acetamides and Derived Oligomers: An Alternative Pathway to 2-Amidophenol-Derived Phytotoxic Metabolites. Molecules 2022; 27:molecules27154786. [PMID: 35897961 PMCID: PMC9330447 DOI: 10.3390/molecules27154786] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/20/2022] [Accepted: 07/22/2022] [Indexed: 02/01/2023] Open
Abstract
Incubation of Aminobacter aminovorans, Paenibacillus polymyxa, and Arthrobacter MPI764 with the microbial 2-benzoxazolinone (BOA)-degradation-product 2-acetamido-phenol, produced from 2-aminophenol, led to the recently identified N-(2-hydroxy-5-nitrophenyl) acetamide, to the hitherto unknown N-(2-hydroxy-5-nitrosophenyl)acetamide, and to N-(2-hydroxy-3-nitrophenyl)acetamide. As an alternative to the formation of phenoxazinone derived from aminophenol, dimers- and trimers-transformation products have been found. Identification of the compounds was carried out by LC/HRMS and MS/MS and, for the new structure N-(2-hydroxy-5-nitrosophenyl)acetamide, additionally by 1D- and 2D-NMR. Incubation of microorganisms, such as the soil bacteria Pseudomonas laurentiana, Arthrobacter MPI763, the yeast Papiliotrema baii and Pantoea ananatis, and the plants Brassica oleracea var. gongylodes L. (kohlrabi) and Arabidopsis thaliana Col-0, with N-(2-hydroxy-5-nitrophenyl) acetamide, led to its glucoside derivative as a prominent detoxification product; in the case of Pantoea ananatis, this was together with the corresponding glucoside succinic acid ester. In contrast, Actinomucor elegans consortium synthesized 2-acetamido-4-nitrophenyl sulfate. 1 mM bioactive N-(2-hydroxy-5-nitrophenyl) acetamide elicits alterations in the Arabidopsis thaliana expression profile of several genes. The most responsive upregulated gene was pathogen-inducible terpene synthase TPS04. The bioactivity of the compound is rapidly annihilated by glucosylation.
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Xiao C, Xu C, Zhang J, Jiang W, Zhang X, Yang C, Xu J, Zhang Y, Zhou T. Soil Microbial Communities Affect the Growth and Secondary Metabolite Accumulation in Bletilla striata (Thunb.) Rchb. f. Front Microbiol 2022; 13:916418. [PMID: 35733964 PMCID: PMC9207479 DOI: 10.3389/fmicb.2022.916418] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Accepted: 05/10/2022] [Indexed: 12/12/2022] Open
Abstract
Bletilla striata (Thunb.) Rchb.f. is a perennial herb belonging to the Orchidaceae family. Its tubers are used in traditional Chinese medicine to treat gastric ulcers, inflammation, silicosis tuberculosis, and pneumogastric hemorrhage. It has been reported that different soil types can affect the growth of B. striata and the accumulation of secondary metabolites in its tubers, but the biological mechanisms underlying these effects remain unclear. In this study, we compared agronomic traits and the accumulation of secondary metabolites (extractum, polysaccharide, total phenol, militarine) in B. striata grown in sandy loam or sandy clay soil. In addition, we compared physicochemical properties and microbial communities between the two soil types. In pot experiments, we tested how irradiating soil or transplanting microbiota from clay or loam into soil affected B. striata growth and accumulation of secondary metabolites. The results showed that sandy loam and sandy clay soils differed significantly in their physicochemical properties as well as in the structure and composition of their microbial communities. Sandy loam soil had higher pH, SOM, SOC, T-Ca, T-N, T-Mg, T-Mn, T-Zn, A-Ca, A-Mn, and A-Cu than sandy clay soil, but significantly lower T-P, T-K, T-Fe, and A-P content. Sandy loam soil showed 7.32% less bacterial diversity based on the Shannon index, 19.59% less based on the Ace index, and 24.55% less based on the Chao index. The first two components of the PCoA explained 74.43% of the variation in the bacterial community (PC1 = 64.92%, PC2 = 9.51%). Similarly, the first two components of the PCoA explained 58.48% of the variation in the fungal community (PC1 = 43.67%, PC2 = 14.81%). The microbiome associated with sandy clay soil can promote the accumulation of militarine in B. striata tubers, but it inhibits the growth of B. striata. The accumulation of secondary metabolites such as militarine in B. striata was significantly higher in sandy clay than in sandy loam soil. Conversely, B. striata grew better in sandy loam soil. The microbiome associated with sandy loam soil can promote the growth of B. striata, but it reduces the accumulation of militarine in B. striata tubers. Pot experiment results further confirmed that the accumulation of secondary metabolites such as militarine was higher in soil transplanted with loam microbiota than in soil transplanted with clay microbiota. These results may help guide efforts to improve B. striata yield and its accumulation of specific secondary metabolites.
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Affiliation(s)
- Chenghong Xiao
- Resource Institute for Chinese and Ethnic Materia Medica, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Chunyun Xu
- Resource Institute for Chinese and Ethnic Materia Medica, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Jinqiang Zhang
- Resource Institute for Chinese and Ethnic Materia Medica, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Weike Jiang
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Xinqing Zhang
- Resource Institute for Chinese and Ethnic Materia Medica, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Changgui Yang
- Resource Institute for Chinese and Ethnic Materia Medica, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Jiao Xu
- Resource Institute for Chinese and Ethnic Materia Medica, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Yongping Zhang
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Tao Zhou
- Resource Institute for Chinese and Ethnic Materia Medica, Guizhou University of Traditional Chinese Medicine, Guiyang, China
- *Correspondence: Tao Zhou,
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14
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Koprivova A, Kopriva S. Plant secondary metabolites altering root microbiome composition and function. CURRENT OPINION IN PLANT BIOLOGY 2022; 67:102227. [PMID: 35525222 DOI: 10.1016/j.pbi.2022.102227] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/29/2022] [Accepted: 03/30/2022] [Indexed: 06/14/2023]
Abstract
Plants share their natural environment with numerous microorganisms, commensal as well as harmful. Plant fitness and performance are thus dependent on an efficient communication with such microbiota. The primary means of communication are metabolites exuded from roots, primarily diverse secondary metabolites. The exuded metabolites trigger changes in composition and function of plant associated microbiome. In the last few years, many metabolites were uncovered that are part of this communication network and modulate specific functions of the root microbiota. Here, we describe the progress in identification of such metabolites and their functions and outline the most significant knowledge gaps for future research.
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Affiliation(s)
- Anna Koprivova
- Institute for Plant Sciences, Cluster of Excellence on Plant Sciences, University of Cologne, Zülpicher Str. 47b, 50674, Cologne, Germany
| | - Stanislav Kopriva
- Institute for Plant Sciences, Cluster of Excellence on Plant Sciences, University of Cologne, Zülpicher Str. 47b, 50674, Cologne, Germany.
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Cantabella D, Dolcet-Sanjuan R, Teixidó N. Using plant growth-promoting microorganisms (PGPMs) to improve plant development under in vitro culture conditions. PLANTA 2022; 255:117. [PMID: 35513731 DOI: 10.1007/s00425-022-03897-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 04/11/2022] [Indexed: 06/14/2023]
Abstract
The use of beneficial microorganisms improves the performance of in vitro - cultured plants through the improvement of plant nutrition, the biological control of microbial pathogens or the production of phytohormones that promote plant growth and development. Plant in vitro culture techniques are highly useful to obtain significant amounts of true-to-type and disease-free plant materials. One of these techniques is clonal micropropagation which consists on the establishment of shoot tip cultures, shoot multiplication, in vitro rooting and acclimatization to ex vitro conditions. However, in some cases, the existence of recalcitrant genotypes, with a compromised multiplication and rooting ability, or the difficulties to overcome the overgrowth of endophytic contaminations might seriously limit its efficiency. In this sense, the establishment of beneficial interactions between plants and plant growth-promoting microorganisms (PGPMs) under in vitro culture conditions might represent a valuable approach to efficiently solve those restrictions. During the last years, significant evidence reporting the use of beneficial microorganisms to improve the yield of in vitro multiplication or rooting as well as their acclimatization to greenhouse or soil conditions have been provided. Most of these positive effects are strongly linked to the ability of these microorganisms to provide in vitro plants with nutrients such as nitrogen or phosphorous, to produce plant growth regulators, to control the growth of pathogens or to mitigate stress conditions. The culture of A. thaliana under aseptic conditions has provided high-quality knowledge on the root development signaling pathways, involving hormones, triggered in the presence of PGPMs. Overall, the present article offers a brief overview of the use of microorganisms to improve in vitro plant performance during the in vitro micropropagation stages, as well as the main mechanisms of plant growth promotion associated with these microorganisms.
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Affiliation(s)
- Daniel Cantabella
- IRTA Plant In Vitro Culture Laboratory, Fruticulture Programme, Lleida, Catalonia, Spain
- Postharvest Programme, IRTA Edifici Fruitcentre, Parc Científic I Tecnològic Agroalimentari de Lleida, 25003, Lleida, Catalonia, Spain
| | - Ramon Dolcet-Sanjuan
- IRTA Plant In Vitro Culture Laboratory, Fruticulture Programme, Lleida, Catalonia, Spain
| | - Neus Teixidó
- Postharvest Programme, IRTA Edifici Fruitcentre, Parc Científic I Tecnològic Agroalimentari de Lleida, 25003, Lleida, Catalonia, Spain.
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16
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Borjigin Q, Zhang B, Yu X, Gao J, Zhang X, Qu J, Ma D, Hu S, Han S. Metagenomics study to compare the taxonomic composition and metabolism of a lignocellulolytic microbial consortium cultured in different carbon conditions. World J Microbiol Biotechnol 2022; 38:78. [PMID: 35325312 DOI: 10.1007/s11274-022-03260-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 03/02/2022] [Indexed: 11/28/2022]
Abstract
A lignocellulolytic microbial consortium holds promise for the in situ biodegradation of crop straw and the comprehensive and effective utilization of agricultural waste. In this study, we applied metagenomics technology to comprehensively explore the metabolic functional potential and taxonomic diversity of the microbial consortia CS (cultured on corn stover) and FP (cultured on filter paper). Analyses of the data on metagenomics taxonomic affiliations revealed considerable differences in the taxonomic composition and carbohydrate-active enzymes profile of the microbial consortia CS and FP. Pseudomonas, Dysgonomonas and Sphingobacterium in CS and Cellvibrio and Pseudomonas in FP had a much wider distribution of lignocellulose degradative ability. The genes for more lignocellulose degradative enzymes were detected when the relatively simple substrate filter paper was used as the carbon source. Clusters of Orthologous Groups (COG) and Kyoto Encyclopedia of Genes and Genomes (KEGG) annotation analyses revealed considerable levels of similarity, and carbohydrate metabolic and amino acid metabolic pathways were the most enriched in CS and FP, respectively. The mechanism used by the two microbial consortia to degrade lignocellulose was similar, but the annotation of quantity of genes indicated that they are diverse and vary greatly. These data underlie the interactions between microorganisms and the synergism of enzymes during the degradative process of lignocellulose under different substrates and suggest the development of potential microbial resources.
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Affiliation(s)
- Qinggeer Borjigin
- Agricultural College, Inner Mongolia Agricultural University, No. 275, XinJian East Street, Hohhot, 010019, China.,Key Laboratory of Crop Cultivation and Genetic Improvement in Inner Mongolia Autonomous Region, No. 275, XinJian East Street, Hohhot, 010019, China
| | - Bizhou Zhang
- Special Crops Institute, Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, No.22, ZhaoJun Road, Hohhot, 010031, China
| | - Xiaofang Yu
- Agricultural College, Inner Mongolia Agricultural University, No. 275, XinJian East Street, Hohhot, 010019, China. .,Key Laboratory of Crop Cultivation and Genetic Improvement in Inner Mongolia Autonomous Region, No. 275, XinJian East Street, Hohhot, 010019, China.
| | - Julin Gao
- Agricultural College, Inner Mongolia Agricultural University, No. 275, XinJian East Street, Hohhot, 010019, China. .,Key Laboratory of Crop Cultivation and Genetic Improvement in Inner Mongolia Autonomous Region, No. 275, XinJian East Street, Hohhot, 010019, China.
| | - Xin Zhang
- Agricultural College, Inner Mongolia Agricultural University, No. 275, XinJian East Street, Hohhot, 010019, China
| | - Jiawei Qu
- Agricultural College, Inner Mongolia Agricultural University, No. 275, XinJian East Street, Hohhot, 010019, China.,Key Laboratory of Crop Cultivation and Genetic Improvement in Inner Mongolia Autonomous Region, No. 275, XinJian East Street, Hohhot, 010019, China
| | - Daling Ma
- Agricultural College, Inner Mongolia Agricultural University, No. 275, XinJian East Street, Hohhot, 010019, China.,Key Laboratory of Crop Cultivation and Genetic Improvement in Inner Mongolia Autonomous Region, No. 275, XinJian East Street, Hohhot, 010019, China
| | - Shuping Hu
- Key Laboratory of Crop Cultivation and Genetic Improvement in Inner Mongolia Autonomous Region, No. 275, XinJian East Street, Hohhot, 010019, China.,Vocational and Technical College, Inner Mongolia Agricultural University, Altan street, Baotou, 014109, China
| | - Shengcai Han
- Key Laboratory of Crop Cultivation and Genetic Improvement in Inner Mongolia Autonomous Region, No. 275, XinJian East Street, Hohhot, 010019, China.,Hortlculture and Plant Protection College, Inner Mongolia Agricultural University, No. 29, Eerduosi East Street, Hohhot, 010019, China
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Laschke L, Schütz V, Schackow O, Sicker D, Hennig L, Hofmann D, Dörmann P, Schulz M. Survival of Plants During Short-Term BOA-OH Exposure: ROS Related Gene Expression and Detoxification Reactions Are Accompanied With Fast Membrane Lipid Repair in Root Tips. J Chem Ecol 2022; 48:219-239. [PMID: 34988771 PMCID: PMC8881443 DOI: 10.1007/s10886-021-01337-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 11/24/2021] [Accepted: 11/26/2021] [Indexed: 11/30/2022]
Abstract
For the characterization of BOA-OH insensitive plants, we studied the time-dependent effects of the benzoxazolinone-4/5/6/7-OH isomers on maize roots. Exposure of Zea mays seedlings to 0.5 mM BOA-OH elicits root zone-specific reactions by the formation of dark rings and spots in the zone of lateral roots, high catalase activity on root hairs, and no visible defense reaction at the root tip. We studied BOA-6-OH- short-term effects on membrane lipids and fatty acids in maize root tips in comparison to the benzoxazinone-free species Abutilon theophrasti Medik. Decreased contents of phosphatidylinositol in A. theophrasti and phosphatidylcholine in maize were found after 10-30 min. In the youngest tissue, α-linoleic acid (18:2), decreased considerably in both species and recovered within one hr. Disturbances in membrane phospholipid contents were balanced in both species within 30-60 min. Triacylglycerols (TAGs) were also affected, but levels of maize diacylglycerols (DAGs) were almost unchanged, suggesting a release of fatty acids for membrane lipid regeneration from TAGs while resulting DAGs are buildings blocks for phospholipid reconstitution, concomitant with BOA-6-OH glucosylation. Expression of superoxide dismutase (SOD2) and of ER-bound oleoyl desaturase (FAD2-2) genes were contemporaneously up regulated in contrast to the catalase CAT1, while CAT3 was arguably involved at a later stage of the detoxification process. Immuno-responses were not elicited in short-terms, since the expression of NPR1, POX12 were barely affected, PR4 after 6 h with BOA-4/7-OH and PR1 after 24 h with BOA-5/6-OH. The rapid membrane recovery, reactive oxygen species, and allelochemical detoxification may be characteristic for BOA-OH insensitive plants.
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Affiliation(s)
- Laura Laschke
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, Karlrobert-Kreiten Str. 13, 53115, Bonn, Germany
| | - Vadim Schütz
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, Karlrobert-Kreiten Str. 13, 53115, Bonn, Germany
| | - Oliver Schackow
- Institute of Organic Chemistry, Institut Für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany
| | - Dieter Sicker
- Institute of Organic Chemistry, Institut Für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany
| | - Lothar Hennig
- Institute of Organic Chemistry, Institut Für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany
| | - Diana Hofmann
- IBG-3: Agrosphäre, Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Peter Dörmann
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, Karlrobert-Kreiten Str. 13, 53115, Bonn, Germany
| | - Margot Schulz
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, Karlrobert-Kreiten Str. 13, 53115, Bonn, Germany.
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Semanti P, Robin RS, Purvaja R, Ramesh R. Fatty acid signatures of sediment microbial community in the chronically polluted mangrove ecosystem. MARINE POLLUTION BULLETIN 2021; 172:112885. [PMID: 34461371 DOI: 10.1016/j.marpolbul.2021.112885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 08/14/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
Phospholipid fatty acid (PLFA) analysis was used to examine variation in the distribution of microbial communities in heavily polluted mangrove sediments of Thane creek, west coast of India. A total of 40 individual PLFAs representing 11 functional groups were identified in the sediment and were mainly dominated by saturated fatty acids (anaerobic prokaryotes) >50%. Significant dominance of PUFA, 16:3 ω6c (34.2%) indicators of micro-eukaryotes, in subsurface depth (p < 0.05) suggests input from the remnants of marine microalgae. Declined mean relative abundance of fungi (<6%) and actinomycetes (<1%) were detected in the sediment indicating their sensitivity to anthropic stressors. Homogenous profile of microbial diversity indicating active bioturbation. Cumulative metabolic stress evident from SAT/MUFA (>1), B/F (>1) and G+/G- (<1) ratio and prolonged hypoxia to be prevalent in the creek during the study. In conclusion, PLFA signatures can thus be used as potential biomarkers of environmental monitoring and proxy for interpreting ecosystem health.
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Affiliation(s)
- P Semanti
- National Centre for Sustainable Coastal Management, Ministry of Environment, Forest and Climate Change, Chennai 600 025, India
| | - R S Robin
- National Centre for Sustainable Coastal Management, Ministry of Environment, Forest and Climate Change, Chennai 600 025, India
| | - R Purvaja
- National Centre for Sustainable Coastal Management, Ministry of Environment, Forest and Climate Change, Chennai 600 025, India
| | - R Ramesh
- National Centre for Sustainable Coastal Management, Ministry of Environment, Forest and Climate Change, Chennai 600 025, India.
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Tagele SB, Kim RH, Shin JH. Interactions between Brassica Biofumigants and Soil Microbiota: Causes and Impacts. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:11538-11553. [PMID: 34551253 DOI: 10.1021/acs.jafc.1c03776] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Biofumigation is used to control soil-borne plant diseases, and it has paramount importance to reduce the cost of chemical fumigants. Information about the field control efficacies and impacts of Brassica-based biofumigation (BBF) on soil bacterial and fungal microbiota is scattered in the literature. Therefore, this review summarizes and discusses the nature and the underlying causes of soil bacterial and fungal community dynamics in response to BBF. In addition, the major factors influencing the interaction between a biofumigant and soil microbiota are discussed. The pros and cons of BBF to soil microbiota and the subsequent impacts on sustainable farming practices are also highlighted.
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Affiliation(s)
- Setu Bazie Tagele
- Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Ryeong-Hui Kim
- Department of Integrative Biology, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Jae-Ho Shin
- Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Republic of Korea
- Department of Integrative Biology, Kyungpook National University, Daegu 41566, Republic of Korea
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20
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Plaszkó T, Szűcs Z, Vasas G, Gonda S. Effects of Glucosinolate-Derived Isothiocyanates on Fungi: A Comprehensive Review on Direct Effects, Mechanisms, Structure-Activity Relationship Data and Possible Agricultural Applications. J Fungi (Basel) 2021; 7:539. [PMID: 34356918 PMCID: PMC8305656 DOI: 10.3390/jof7070539] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 06/24/2021] [Accepted: 07/03/2021] [Indexed: 12/29/2022] Open
Abstract
Plants heavily rely on chemical defense systems against a variety of stressors. The glucosinolates in the Brassicaceae and some allies are the core molecules of one of the most researched such pathways. These natural products are enzymatically converted into isothiocyanates (ITCs) and occasionally other defensive volatile organic constituents (VOCs) upon fungal challenge or tissue disruption to protect the host against the stressor. The current review provides a comprehensive insight on the effects of the isothiocyanates on fungi, including, but not limited to mycorrhizal fungi and pathogens of Brassicaceae. In the review, our current knowledge on the following topics are summarized: direct antifungal activity and the proposed mechanisms of antifungal action, QSAR (quantitative structure-activity relationships), synergistic activity of ITCs with other agents, effects of ITCs on soil microbial composition and allelopathic activity. A detailed insight into the possible applications is also provided: the literature of biofumigation studies, inhibition of post-harvest pathogenesis and protection of various products including grains and fruits is also reviewed herein.
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Affiliation(s)
- Tamás Plaszkó
- Department of Botany, Division of Pharmacognosy, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary; (T.P.); (Z.S.); (G.V.)
- Doctoral School of Pharmaceutical Sciences, University of Debrecen, 4032 Debrecen, Hungary
| | - Zsolt Szűcs
- Department of Botany, Division of Pharmacognosy, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary; (T.P.); (Z.S.); (G.V.)
- Healthcare Industry Institute, University of Debrecen, 4032 Debrecen, Hungary
| | - Gábor Vasas
- Department of Botany, Division of Pharmacognosy, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary; (T.P.); (Z.S.); (G.V.)
| | - Sándor Gonda
- Department of Botany, Division of Pharmacognosy, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary; (T.P.); (Z.S.); (G.V.)
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21
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Dunn L, Lang C, Marilleau N, Terrat S, Biju-Duval L, Lelièvre M, Perrin S, Chemidlin Prévost-Bouré N. Soil microbial communities in the face of changing farming practices: A case study in an agricultural landscape in France. PLoS One 2021; 16:e0252216. [PMID: 34138883 PMCID: PMC8211295 DOI: 10.1371/journal.pone.0252216] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 05/12/2021] [Indexed: 11/19/2022] Open
Abstract
According to biogeography studies, the abundance and richness of soil microorganisms vary across multiple spatial scales according to soil properties and farming practices. However, soil microorganisms also exhibit poorly understood temporal variations. This study aimed at better understanding how soil microbial communities respond to changes in farming practices at a landscape scale over time. A regular grid of 269 sites was set up across a 1,200 ha farming landscape, and soil samples were characterized for their molecular microbial biomass and bacterial richness at two dates (2011 and 2016). A mapping approach highlighted that spatial microbial patterns were stable over time, while abundance and richness levels were modified. The drivers of these changes were investigated though a PLS-PM (partial least square path-modeling) approach. Soil properties were stable over time, but farming practices changed. Molecular microbial biomass was mainly driven by soil resources, whereas bacterial richness depended on both farming practices and ecological parameters. Previous-crop and management effects and a temporal dependence of the microbial community on the historical farming management were also highlighted.
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Affiliation(s)
- Laurie Dunn
- UMR 1347 Agroécologie, INRAE, AgrosupDijon, Université Bourgogne Franche-Comté, Dijon, France
| | - Christophe Lang
- Institut de Recherche Femto-ST, CNRS, Université Bourgogne Franche-Comté, Besançon, France
| | | | - Sébastien Terrat
- UMR 1347 Agroécologie, INRAE, AgrosupDijon, Université Bourgogne Franche-Comté, Dijon, France
| | - Luc Biju-Duval
- UMR 1347 Agroécologie, INRAE, AgrosupDijon, Université Bourgogne Franche-Comté, Dijon, France
| | | | - Solène Perrin
- UMR 1347 Agroécologie, Plateforme GenoSol, INRAE, Dijon, France
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22
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Schütz V, Frindte K, Cui J, Zhang P, Hacquard S, Schulze-Lefert P, Knief C, Schulz M, Dörmann P. Differential Impact of Plant Secondary Metabolites on the Soil Microbiota. Front Microbiol 2021; 12:666010. [PMID: 34122379 PMCID: PMC8195599 DOI: 10.3389/fmicb.2021.666010] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 04/27/2021] [Indexed: 11/28/2022] Open
Abstract
Plant metabolites can shape the microbial community composition in the soil. Two indole metabolites, benzoxazolinone (BOA) and gramine, produced by different Gramineae species, and quercetin, a flavonoid synthesized by many dicot species, were studied for their impacts on the community structure of field soil bacteria. The three plant metabolites were directly added to agricultural soil over a period of 28 days. Alterations in bacterial composition were monitored by next generation sequencing of 16S rRNA gene PCR products and phospholipid fatty acid analysis. Treatment of the soil with the plant metabolites altered the community composition from phylum to amplicon sequence variant (ASV) level. Alpha diversity was significantly reduced by BOA or quercetin, but not by gramine. BOA treatment caused a decrease of the relative abundance of 11 ASVs, while only 10 ASVs were increased. Gramine or quercetin treatment resulted in the increase in relative abundance of many more ASVs (33 or 38, respectively), most of them belonging to the Proteobacteria. Isolation and characterization of cultivable bacteria indicated an enrichment in Pseudarthrobacter or Pseudomonas strains under BOA/quercetin or BOA/gramine treatments, respectively. Therefore, the effects of the treatments on soil bacteria were characteristic for each metabolite, with BOA exerting a predominantly inhibitory effect, with only few genera being able to proliferate, while gramine and quercetin caused the proliferation of many potentially beneficial strains. As a consequence, BOA or gramine biosynthesis, which have evolved in different barley species, is accompanied with the association of distinct bacterial communities in the soil, presumably after mutual adaptation during evolution.
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Affiliation(s)
- Vadim Schütz
- Institute of Molecular Physiology and Biotechnology of Plants, Bonn, Germany
| | - Katharina Frindte
- Institute of Crop Science and Resource Conservation, Molecular Biology of the Rhizosphere, Bonn, Germany
| | - Jiaxin Cui
- Institute of Molecular Physiology and Biotechnology of Plants, Bonn, Germany
| | - Pengfan Zhang
- Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | | | | | - Claudia Knief
- Institute of Crop Science and Resource Conservation, Molecular Biology of the Rhizosphere, Bonn, Germany
| | - Margot Schulz
- Institute of Molecular Physiology and Biotechnology of Plants, Bonn, Germany
| | - Peter Dörmann
- Institute of Molecular Physiology and Biotechnology of Plants, Bonn, Germany
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23
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The gut microbiota composition of Trichoplusia ni is altered by diet and may influence its polyphagous behavior. Sci Rep 2021; 11:5786. [PMID: 33707556 PMCID: PMC7970945 DOI: 10.1038/s41598-021-85057-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 02/15/2021] [Indexed: 12/25/2022] Open
Abstract
Insects are known plant pests, and some of them such as Trichoplusia ni feed on a variety of crops. In this study, Trichoplusia ni was fed distinct diets of leaves of Arabidopsis thaliana or Solanum lycopersicum as well as an artificial diet. After four generations, the microbial composition of the insect gut was evaluated to determine if the diet influenced the structure and function of the microbial communities. The population fed with A. thaliana had higher proportions of Shinella, Terribacillus and Propionibacterium, and these genera are known to have tolerance to glucosinolate activity, which is produced by A. thaliana to deter insects. The population fed with S. lycopersicum expressed increased relative abundances of the Agrobacterium and Rhizobium genera. These microbial members can degrade alkaloids, which are produced by S. lycopersicum. All five of these genera were also present in the respective leaves of either A. thaliana or S. lycopersicum, suggesting that these microbes are acquired by the insects from the diet itself. This study describes a potential mechanism used by generalist insects to become habituated to their available diet based on acquisition of phytochemical degrading gut bacteria.
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24
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Palma-Cano LE, Piñon-Castillo HA, Tarango-Rivero SH, Carbon A, Salas-Leiva J, Muñoz-Castellanos LN, Cravo-Laureau C, Duran R, Orrantia-Borunda E. Effect of organic and conventional farming on soil bacterial diversity of pecan tree (Carya illinoensis K. Kosh) orchard across two phenological stages. Lett Appl Microbiol 2021; 72:556-569. [PMID: 33453128 DOI: 10.1111/lam.13452] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 12/29/2020] [Accepted: 01/11/2021] [Indexed: 12/19/2022]
Abstract
We described the bacterial diversity of walnut grove soils under organic and conventional farming. The bacterial communities of rhizospheric and nonrhizospheric soils of pecan tree (Carya illinoensis K. Koch) were compared considering two phenological stages (sprouting and ripening). Sixteen operational taxonomic units (OTUs) were identified significantly more abundant according to the plant development, only one according to the farming condition, and none according to the soil origin. The OTUs specificaly abundant according to plant development included Actinobateria (2) and Betaproteobacteria (1) related OTUs more abundant at the sprouting stage, while at the fruit ripening (FR) stage the more abundant OTUs were related to Actinobacteria (6), Alphaproteobacteria (6), and unclassified Bacteria (1). The Gaiellaceae OTU18 (Actinobacteria) was more abundant under conventional farming. Thus, our study revealed that the plant development stage was the main factor shaping the bacterial community structure, while less influence was noticed for the farming condition. The bacterial communities exhibited specific metabolic capacities, a large range of carbon sources being used at the FR stage. The identified OTUs specifically more abundant represent indicators providing useful information on soil condition, potential tools for the management of soil bacterial communities.
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Affiliation(s)
- L E Palma-Cano
- Centro de Investigación en Materiales Avanzados, Chihuahua, México
| | - H A Piñon-Castillo
- Facultad de Ciencias Químicas de la Universidad Autónoma de Chihuahua, Chihuahua, México
| | | | - A Carbon
- Université de Pau et des Pays de l'Adour, UPPA/E2S, IPREM, UMR CNRS 5254, Bat. IBEAS, Pau, France
| | - J Salas-Leiva
- Centro de Investigación en Materiales Avanzados, Chihuahua, México.,Cátedra-CONACyT, Centro de Investigación en Materiales Avanzados, Chihuahua, México
| | - L N Muñoz-Castellanos
- Facultad de Ciencias Químicas de la Universidad Autónoma de Chihuahua, Chihuahua, México
| | - C Cravo-Laureau
- Université de Pau et des Pays de l'Adour, UPPA/E2S, IPREM, UMR CNRS 5254, Bat. IBEAS, Pau, France
| | - R Duran
- Université de Pau et des Pays de l'Adour, UPPA/E2S, IPREM, UMR CNRS 5254, Bat. IBEAS, Pau, France
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25
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Mitreiter S, Gigolashvili T. Regulation of glucosinolate biosynthesis. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:70-91. [PMID: 33313802 DOI: 10.1093/jxb/eraa479] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 10/14/2020] [Indexed: 05/18/2023]
Abstract
Glucosinolates are secondary defense metabolites produced by plants of the order Brassicales, which includes the model species Arabidopsis and many crop species. In the past 13 years, the regulation of glucosinolate synthesis in plants has been intensively studied, with recent research revealing complex molecular mechanisms that connect glucosinolate production with responses to other central pathways. In this review, we discuss how the regulation of glucosinolate biosynthesis is ecologically relevant for plants, how it is controlled by transcription factors, and how this transcriptional machinery interacts with hormonal, environmental, and epigenetic mechanisms. We present the central players in glucosinolate regulation, MYB and basic helix-loop-helix transcription factors, as well as the plant hormone jasmonate, which together with other hormones and environmental signals allow the coordinated and rapid regulation of glucosinolate genes. Furthermore, we highlight the regulatory connections between glucosinolates, auxin, and sulfur metabolism and discuss emerging insights and open questions on the regulation of glucosinolate biosynthesis.
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Affiliation(s)
- Simon Mitreiter
- Institute for Plant Sciences and Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Cologne, Germany
| | - Tamara Gigolashvili
- Institute for Plant Sciences and Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Cologne, Germany
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26
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Gong L, Chen X, Zhang X, Yang X, Cai Y. Schrenk spruce leaf litter decomposition varies with snow depth in the Tianshan Mountains. Sci Rep 2020; 10:19556. [PMID: 33177573 PMCID: PMC7658357 DOI: 10.1038/s41598-020-76368-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 10/26/2020] [Indexed: 12/04/2022] Open
Abstract
Seasonal snowfall, a sensitive climate factor and the main form of precipitation in arid areas, is important for forest material circulation and surface processes and profoundly impacts litter decomposition and element turnover. However, how the thickness and duration of snow cover affect litter decomposition and element release remain unclear. Thus, to understand the effects of snow on litter decomposition, fiber degradation and their relationships with soil properties, a field litterbag experiment was conducted under no, thin, medium, and thick snow cover in a Schrenk spruce (Picea schrenkiana) forest gap in the Tianshan Mountains. The snow cover period exhibited markedly lower rates of decomposition than the snow-free period. The litter lignin, cellulose and N concentrations in the pregrowing season and middle growing season were significantly higher than those in the deep-freeze period, and the litter C and P concentrations were significantly higher during the onset of the freeze-thaw period, deep-freeze period and thaw period than in the late growing season. The litter cellulose, C and N concentrations were significantly higher under thick snow cover than under no snow cover in most stages. Moreover, the correlations among litter mass, cellulose, lignin/cellulose and soil bulk density varied with snow cover depth. The temporal variations and snow cover depth affected the decomposition process significantly. The former affected lignin, cellulose and P, and the latter affected cellulose, C and N and changed the litter-soil properties relationship. These differences provide references for understanding how winter conditions affect material cycling and other ecological processes under climate change.
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Affiliation(s)
- Lu Gong
- College of Resources and Environment Science, Xinjiang University, Urumqi, 830046, China.
- Key Laboratory of Oasis Ecology, Ministry of Education, Urumqi, 830046, China.
| | - Xin Chen
- College of Resources and Environment Science, Xinjiang University, Urumqi, 830046, China
- Key Laboratory of Oasis Ecology, Ministry of Education, Urumqi, 830046, China
| | - Xueni Zhang
- College of Resources and Environment Science, Xinjiang University, Urumqi, 830046, China
- Key Laboratory of Oasis Ecology, Ministry of Education, Urumqi, 830046, China
| | - Xiaodong Yang
- College of Resources and Environment Science, Xinjiang University, Urumqi, 830046, China
- Key Laboratory of Oasis Ecology, Ministry of Education, Urumqi, 830046, China
| | - Yanjiang Cai
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, 666 Wusu Street, Lin'an District, Hangzhou, 311300, China.
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27
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Abstract
Replant disease is a soil (micro-) biome-based, harmfully-disturbed physiological and morphological reaction of plants to replanting similar cultures on the same sites by demonstrating growth retardation and leading to economic losses especially in Rosaceae plant production. Commonly, replant disease is overcome by soil fumigation with toxic chemicals. With chemical soil fumigation being restricted in many countries, other strategies are needed. Biofumigation, which is characterized by the incorporation of Brassicaceae plant materials into soil, is a promising method. We review the potential of biofumigation in the fight against replant disease. Biofumigation using optimized Brassicaceae seed meal compositions in combination with replant disease tolerant plant genotypes shows promising results, but the efficacy is still soil and site-dependent. Therefore, future studies should address the optimal timing as well as amount and type of incorporated plant material and environmental conditions during incubation in dependence of the soil physical and chemical characteristics.
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28
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The Trichoderma viride F-00612 consortium tolerates 2-amino-3H-phenoxazin-3-one and degrades nitrated benzo[d]oxazol-2(3H)-one. CHEMOECOLOGY 2020. [DOI: 10.1007/s00049-020-00300-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
AbstractNumerous allelopathic plant secondary metabolites impact plant–microorganism interactions by injuring plant-associated beneficial bacteria and fungi. Fungi belonging to the genus Trichoderma positively influence crops, including benzoxazinone-containing maize. However, benzoxazinones and their downstream metabolites such as benzoxazolinone and phenoxazinones are often fungitoxic. Specimen Trichoderma viride F-00612 was found to be insensitive to 100-µM phenoxazinone and 500-µM benzoxazolinone. Screening of 46 additional specimens of ascomycetes revealed insensitivity to phenoxazinones among fungi that cause disease in benzoxazinone-producing cereal crops, whereas many other ascomycetes were highly sensitive. In contrast, most of the screened fungi were insensitive to benzoxazolinone. T. viride F-00612 was associated with bacteria and, thus, existed as a consortium. By contrast, Enterobacter species and Acinetobacter calcoaceticus were prominent in the original specimen, and Bacillus species predominated after antibiotic application. Prolonged cultivation of T. viride F-00612 in liquid medium and on Czapek agar in the presence of < 100 µM phenoxazinone and < 500 µM benzoxazolinone resulted in a massive loss of bacteria accompanied by impacted fungal growth in the presence of phenoxazinone. The original consortium was actively involved in implementing metabolic sequences for the degradation and detoxification of nitrated benzoxazolinone derivatives. The 2-aminophenol was rapidly converted into acetamidophenol, but benzoxazolinone, methoxylated benzoxazolinone, and picolinic acid remained unchanged. Excluding phenoxazinone, none of the tested compounds markedly impaired fungal growth in liquid culture. In conclusion, members of the T. viride F-00612 consortium may contribute to the ability to manage benzoxazinone downstream products and facilitate BOA-6-OH degradation via nitration.
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29
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Hansen JC, Schillinger WF, Sullivan TS, Paulitz TC. Soil Microbial Biomass and Fungi Reduced With Canola Introduced Into Long-Term Monoculture Wheat Rotations. Front Microbiol 2019; 10:1488. [PMID: 31354643 PMCID: PMC6637790 DOI: 10.3389/fmicb.2019.01488] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Accepted: 06/14/2019] [Indexed: 01/29/2023] Open
Abstract
With increasing canola (Brassica napus L.) acreage in the Inland Pacific Northwest of the USA, we investigated the effect of this relatively new rotational crop on soil microbial communities and the performance of subsequent wheat (Triticum aestivum L.) crops. In a 6-year on-farm canola-wheat rotation study conducted near Davenport, WA, grain yields of spring wheat (SW) following winter canola (WC) were reduced an average of 17% compared to SW yields following winter wheat (WW). Using soil samples collected and analyzed every year from that study, the objective of this research was to determine the differences and similarities in the soil microbial communities associated with WC and WW, and if those differences were associated with SW yield response. Microbial biomass and community composition were determined using phospholipid fatty acid analysis (PLFA). The WC-associated microbial community contained significantly less fungi, mycorrhizae, and total microbial biomass than WW. Additionally, reduced fungal and mycorrhizal abundance in SW following WC suggests that the canola rotation effect can persist. A biocidal secondary metabolite of canola, isothiocyanate, may be a potential mechanism mediating the decline in soil microbial biomass. These results demonstrate the relationship between soil microbial community composition and crop productivity. Our data suggest that WC can have significant effects on soil microbial communities that ultimately drive microbially mediated soil processes.
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Affiliation(s)
- Jeremy C Hansen
- Northwest Sustainable Agroecosystems Research Unit, USDA-Agricultural Research Service, Washington State University, Pullman, WA, United States
| | - William F Schillinger
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, United States
| | - Tarah S Sullivan
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, United States
| | - Timothy C Paulitz
- Wheat Health, Genetics, and Quality Research Unit, USDA-Agricultural Research Service, Washington State University, Pullman, WA, United States
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30
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Schütz V, Bigler L, Girel S, Laschke L, Sicker D, Schulz M. Conversions of Benzoxazinoids and Downstream Metabolites by Soil Microorganisms. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00238] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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31
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Portier E, Silver WL, Yang WH. Invasive perennial forb effects on gross soil nitrogen cycling and nitrous oxide fluxes depend on phenology. Ecology 2019; 100:e02716. [DOI: 10.1002/ecy.2716] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 02/28/2019] [Accepted: 03/11/2019] [Indexed: 12/29/2022]
Affiliation(s)
- Evan Portier
- Ecosystem Sciences Division Department of Environmental Science, Policy, and Management University of California Berkeley California 94720 USA
| | - Whendee L. Silver
- Ecosystem Sciences Division Department of Environmental Science, Policy, and Management University of California Berkeley California 94720 USA
| | - Wendy H. Yang
- Ecosystem Sciences Division Department of Environmental Science, Policy, and Management University of California Berkeley California 94720 USA
- Departments of Plant Biology and Geology University of Illinois 505 South Goodwin Avenue Urbana Illinois 61801 USA
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32
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Hu P, Wu L, Hollister EB, Wang AS, Somenahally AC, Hons FM, Gentry TJ. Fungal Community Structural and Microbial Functional Pattern Changes After Soil Amendments by Oilseed Meals of Jatropha curcas and Camelina sativa: A Microcosm Study. Front Microbiol 2019; 10:537. [PMID: 30984123 PMCID: PMC6450180 DOI: 10.3389/fmicb.2019.00537] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 03/01/2019] [Indexed: 11/13/2022] Open
Abstract
The meals after oil extraction from many oilseed crops have nutrition and biofumigation potential for land application. Oilseed meal (SM) from the dedicated bioenergy crop Jatropha curcas were implicated to contain compounds that have antibacterial properties on some soil pathogens. However, little is known about its effect on non-targeted soil microbial community, especially on fungi. SM from Camelina sativa contains moderate level of glucosinolates (GLS) and was under studied. To investigate soil fungal community responses to jatropha and camelina SMs, we conducted a lab based microcosm study, amending soil with 1% SMs of jatropha, camelina, flax, and biomass of wheat straw. Fungal community abundance and structure were analyzed based on the ITS region using qPCR and tag-pyrosequencing. Microbial functional changes were examined by community level physiological profile (CLPP) using Biolog assay. Both SMs from jatropha and camelina showed biofumigant properties and inhibited fungal proliferation. Jatropha SM significantly altered soil fungal community structures with lower fungal biodiversity and higher Chaetomium composition. Camelina SM amended soil promoted Fusarium proliferation. CLPP indicated sequential hierarchy for C metabolism in the oilseed-amended microcosms was generally complex C > phosphate-associated C > carboxylic acids > carbohydrates > amines > amino acids. No significant difference in CLPP was detected due to the type of SM treatment. Our data indicate that both SMs of jatropha and camelina have biofumigant properties and can differentially impact soil microbial communities, and the changes were relatively persistent over time. Microbial functional patterns on the other side were not impacted by SM type. Our study revealed biofumigant and nutritional influence of SMs from dedicated biofuel plants on soil microbial community. This information will help properly using jatropha and camelina SMs for pathogen control while minimizing their negative impacts on non-target microorganisms. However, further studies in the field are demanded to investigate their influences in real practice.
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Affiliation(s)
- Ping Hu
- Key Laboratory of Environment and Health (HUST), Ministry of Education and Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubation), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Liangjun Wu
- Department of Forensic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Emily B. Hollister
- Baylor College of Medicine, Houston, TX, United States
- Texas Children’s Hospital, Houston, TX, United States
| | - Autumn S. Wang
- Department of Soil and Crop Sciences, Texas A&M University, College Station, TX, United States
| | | | - Frank M. Hons
- Department of Soil and Crop Sciences, Texas A&M University, College Station, TX, United States
| | - Terry J. Gentry
- Department of Soil and Crop Sciences, Texas A&M University, College Station, TX, United States
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