1
|
Louviot F, Abdelrahman O, Abou-Mansour E, L'Haridon F, Allard PM, Falquet L, Weisskopf L. Oligomycin-producing Streptomyces sp. newly isolated from Swiss soils efficiently protect Arabidopsis thaliana against Botrytis cinerea. mSphere 2024; 9:e0066723. [PMID: 38864637 PMCID: PMC11288007 DOI: 10.1128/msphere.00667-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 05/05/2024] [Indexed: 06/13/2024] Open
Abstract
Botrytis cinerea is a necrotrophic phytopathogen able to attack more than 200 different plant species causing strong yield losses worldwide. Many synthetic fungicides have been developed to control this disease, resulting in the rise of fungicide-resistance B. cinerea strains. The aim of this study was to identify Streptomyces strains showing antagonistic activity against B. cinerea to contribute to plant protection in an environmentally friendly way. We isolated 15 Actinomycete strains from 9 different Swiss soils. The culture filtrates of three isolates showing antifungal activity inhibited spore germination and delayed mycelial growth of B. cinerea. Infection experiments showed that Arabidopsis thaliana plants were more resistant to this pathogen after leaf treatment with the Streptomyces filtrates. Bioassay-guided isolation of the active compounds revealed the presence of germicidins A and B as well as of oligomycins A, B, and E. While germicidins were mostly inactive, oligomycin B reduced the mycelial growth of B. cinerea significantly. Moreover, all three oligomycins inhibited this fungus' spore germination, suggesting that these molecules might contribute to the Streptomyces's ability to protect plants against infection by the broad host-pathogen Botrytis cinerea. IMPORTANCE This study reports the isolation of new Streptomyces strains with strong plant-protective potential mediated by their production of specialized metabolites. Using the broad host range pathogenic fungus Botrytis cinerea, we demonstrate that the cell-free filtrate of selected Streptomyces isolates efficiently inhibits different developmental stages of the fungus, including mycelial growth and the epidemiologically relevant spore germination. Beyond in vitro experiments, the strains and their metabolites also efficiently protected plants against the disease caused by this pathogen. This work further identifies oligomycins as active compounds involved in the observed antifungal activity of the strains. This work shows that we can harness the natural ability of soil-borne microbes and of their metabolites to efficiently fight other microbes responsible for significant crop losses. This opens the way to the development of environmentally friendly health protection measures for crops of agronomical relevance, based on these newly isolated strains or their metabolic extracts containing oligomycins.
Collapse
Affiliation(s)
- Fanny Louviot
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Ola Abdelrahman
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | | | | | | | - Laurent Falquet
- Department of Biology, University of Fribourg, Fribourg, Switzerland
- Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Laure Weisskopf
- Department of Biology, University of Fribourg, Fribourg, Switzerland
- Food Research and Innovation Centre, University of Fribourg, Fribourg, Switzerland
| |
Collapse
|
2
|
Raveau R, Ilbert C, Héloir MC, Palavioux K, Pébarthé-Courrouilh A, Marzari T, Durand S, Valls-Fonayet J, Cluzet S, Adrian M, Fermaud M. Broad-Spectrum Efficacy and Modes of Action of Two Bacillus Strains against Grapevine Black Rot and Downy Mildew. J Fungi (Basel) 2024; 10:471. [PMID: 39057356 PMCID: PMC11278100 DOI: 10.3390/jof10070471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2024] [Revised: 06/27/2024] [Accepted: 07/04/2024] [Indexed: 07/28/2024] Open
Abstract
Black rot (Guignardia bidwellii) and downy mildew (Plasmopara viticola) are two major grapevine diseases against which the development of efficient biocontrol solutions is required in a context of sustainable viticulture. This study aimed at evaluating and comparing the efficacy and modes of action of bacterial culture supernatants from Bacillus velezensis Buz14 and B. ginsengihumi S38. Both biocontrol agents (BCA) were previously demonstrated as highly effective against Botrytis cinerea in grapevines. In semi-controlled conditions, both supernatants provided significant protection against black rot and downy mildew. They exhibited antibiosis against the pathogens by significantly decreasing G. bidwellii mycelial growth, but also the release and motility of P. viticola zoospores. They also significantly induced grapevine defences, as stilbene production. The LB medium, used for the bacterial cultures, also showed partial effects against both pathogens and induced plant defences. This is discussed in terms of choice of experimental controls when studying the biological activity of BCA supernatants. Thus, we identified two bacterial culture supernatants as new potential biocontrol products exhibiting multi-spectrum antagonist activity against different grapevine key pathogens and having a dual mode of action.
Collapse
Affiliation(s)
- Robin Raveau
- National Research Institute for Agriculture, Food and the Environment (INRAE), Institute of Vine and Wine Sciences (ISVV), UMR Santé Agroécologie du VignoblE (SAVE), 71 Avenue E. Bourlaux, CS 20032, 33882 Villenave d’Ornon, France
| | - Chloé Ilbert
- Agroécologie, National Research Institute for Agriculture, Food and the Environment (INRAE), Institut Agro Dijon, Univ. Bourgogne, 21000 Dijon, France
| | - Marie-Claire Héloir
- Agroécologie, National Research Institute for Agriculture, Food and the Environment (INRAE), Institut Agro Dijon, Univ. Bourgogne, 21000 Dijon, France
| | - Karine Palavioux
- Agroécologie, National Research Institute for Agriculture, Food and the Environment (INRAE), Institut Agro Dijon, Univ. Bourgogne, 21000 Dijon, France
| | - Anthony Pébarthé-Courrouilh
- Univ. Bordeaux, Bordeaux INP, National Research Institute for Agriculture, Food and the Environment (INRAE), OENO, UMR 1366, Institute of Vine and Wine Sciences (ISVV), 33140 Villenave d’Ornon, France
| | - Tania Marzari
- Agroécologie, National Research Institute for Agriculture, Food and the Environment (INRAE), Institut Agro Dijon, Univ. Bourgogne, 21000 Dijon, France
| | - Solène Durand
- National Research Institute for Agriculture, Food and the Environment (INRAE), Institute of Vine and Wine Sciences (ISVV), UMR Santé Agroécologie du VignoblE (SAVE), 71 Avenue E. Bourlaux, CS 20032, 33882 Villenave d’Ornon, France
| | - Josep Valls-Fonayet
- Univ. Bordeaux, Bordeaux INP, National Research Institute for Agriculture, Food and the Environment (INRAE), OENO, UMR 1366, Institute of Vine and Wine Sciences (ISVV), 33140 Villenave d’Ornon, France
- Bordeaux Metabolome, MetaboHUB, 33140 Villenave d’Ornon, France
| | - Stéphanie Cluzet
- Univ. Bordeaux, Bordeaux INP, National Research Institute for Agriculture, Food and the Environment (INRAE), OENO, UMR 1366, Institute of Vine and Wine Sciences (ISVV), 33140 Villenave d’Ornon, France
| | - Marielle Adrian
- Agroécologie, National Research Institute for Agriculture, Food and the Environment (INRAE), Institut Agro Dijon, Univ. Bourgogne, 21000 Dijon, France
| | - Marc Fermaud
- National Research Institute for Agriculture, Food and the Environment (INRAE), Institute of Vine and Wine Sciences (ISVV), UMR Santé Agroécologie du VignoblE (SAVE), 71 Avenue E. Bourlaux, CS 20032, 33882 Villenave d’Ornon, France
| |
Collapse
|
3
|
Wekesa TB, Wekesa VW, Onguso JM, Kavesu N, Okanya PW. Study of Pathogenicity Test, Antifungal Activity, and Secondary Metabolites of Bacillus spp. from Lake Bogoria as Biocontrol of Rhizoctonia solani Kühn in Phaseolus vulgaris L. Int J Microbiol 2024; 2024:6620490. [PMID: 38974709 PMCID: PMC11226341 DOI: 10.1155/2024/6620490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 03/05/2024] [Accepted: 05/23/2024] [Indexed: 07/09/2024] Open
Abstract
The common bean (Phaseolus vulgaris L.) is a yearly herbaceous plant grown for its edible dry seeds. Despite that, pests and diseases have contributed to the decline of common bean production in Kenya. Therefore, the study aimed to identify bacteria from Lake Bogoria, assess the pathogenicity of Rhizoctonia solani Kühn, screen for effective antifungal agents, and determine secondary metabolites for the biocontrol of R. solani. A total of 49 bacteria were isolated, of which 10 isolates had varied mycelial inhibition rates of R. solani in the co-culture technique. The efficacy of volatile compounds of the three selected bacterial strains had varied mycelial growth and percent reduction against R. solani. The pathogenicity assay showed varied plant parameters and biomass of R. solani on common bean plantlets. The molecular characterization based on 16 S ribosomal RNA confirmed the selected bacterial strains' identity with a diversity similar to the Bacillus genus. Gas chromatography-mass spectrometry analysis of secondary metabolites showed different antimicrobial compounds produced by Bacillus subtilis strain TW21. In conclusion, Lake Bogoria harbors useful microbes as biocontrol agents against plant pathogens. The current study discovers the potential biocontrol bacteria isolates from Lake Bogoria as alternative bioagents against R. solani. Therefore, the isolate Bacillus subtilis strain TW21 can be assessed further for toxicological and ecotoxicological studies and registered by the Pest Control Products Board (PCPB), Kenya, as a biocontrol product against common diseases affecting common beans' production.
Collapse
Affiliation(s)
- Tofick Barasa Wekesa
- Jomo Kenyatta University of Agriculture and Technology, Institute for Biotechnology Research, P.O. Box 62000-00200, Nairobi, Kenya
| | - Vitalis Wafula Wekesa
- Bioline Agrosciences Africa Limited Production, P.O. Box 1927-20117, Naivasha, Kenya
| | - Justus Mong'are Onguso
- Jomo Kenyatta University of Agriculture and Technology, Institute for Biotechnology Research, P.O. Box 62000-00200, Nairobi, Kenya
| | - Ndinda Kavesu
- Jomo Kenyatta University of Agriculture and Technology, Institute for Biotechnology Research, P.O. Box 62000-00200, Nairobi, Kenya
| | - Patrick Wafula Okanya
- The Technical University of Kenya, Department of Biochemistry and Biotechnology, P.O. Box 52428-00200, Nairobi, Kenya
| |
Collapse
|
4
|
Saadaoui M, Faize M, Rifai A, Tayeb K, Omri Ben Youssef N, Kharrat M, Roeckel-Drevet P, Chaar H, Venisse JS. Evaluation of Tunisian wheat endophytes as plant growth promoting bacteria and biological control agents against Fusarium culmorum. PLoS One 2024; 19:e0300791. [PMID: 38758965 PMCID: PMC11101125 DOI: 10.1371/journal.pone.0300791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 03/05/2024] [Indexed: 05/19/2024] Open
Abstract
Plant growth-promoting rhizobacteria (PGPR) applications have emerged as an ideal substitute for synthetic chemicals by their ability to improve plant nutrition and resistance against pathogens. In this study, we isolated fourteen root endophytes from healthy wheat roots cultivated in Tunisia. The isolates were identified based from their 16S rRNA gene sequences. They belonged to Bacillota and Pseudomonadota taxa. Fourteen strains were tested for their growth-promoting and defense-eliciting potentials on durum wheat under greenhouse conditions, and for their in vitro biocontrol power against Fusarium culmorum, an ascomycete responsible for seedling blight, foot and root rot, and head blight diseases of wheat. We found that all the strains improved shoot and/or root biomass accumulation, with Bacillus mojavensis, Paenibacillus peoriae and Variovorax paradoxus showing the strongest promoting effects. These physiological effects were correlated with the plant growth-promoting traits of the bacterial endophytes, which produced indole-related compounds, ammonia, and hydrogen cyanide (HCN), and solubilized phosphate and zinc. Likewise, plant defense accumulations were modulated lastingly and systematically in roots and leaves by all the strains. Testing in vitro antagonism against F. culmorum revealed an inhibition activity exceeding 40% for five strains: Bacillus cereus, Paenibacillus peoriae, Paenibacillus polymyxa, Pantoae agglomerans, and Pseudomonas aeruginosa. These strains exhibited significant inhibitory effects on F. culmorum mycelia growth, sporulation, and/or macroconidia germination. P. peoriae performed best, with total inhibition of sporulation and macroconidia germination. These finding highlight the effectiveness of root bacterial endophytes in promoting plant growth and resistance, and in controlling phytopathogens such as F. culmorum. This is the first report identifying 14 bacterial candidates as potential agents for the control of F. culmorum, of which Paenibacillus peoriae and/or its intracellular metabolites have potential for development as biopesticides.
Collapse
Affiliation(s)
- Mouadh Saadaoui
- Université Clermont Auvergne, INRAE, PIAF, Clermont-Ferrand, France
- Université de Tunis El Manar, Campus Universitaire Farhat Hached, Tunis, Tunisia
- Field Crops Laboratory, National Institute for Agricultural Research of Tunisia, Tunisia, Tunisia
| | - Mohamed Faize
- Laboratory of Plant Biotechnology, Ecology and Ecosystem Valorization CNRST-URL10, Faculty of Sciences, University Chouaib Doukkali, El Jadida, Morocco
| | - Aicha Rifai
- Laboratory of Plant Biotechnology, Ecology and Ecosystem Valorization CNRST-URL10, Faculty of Sciences, University Chouaib Doukkali, El Jadida, Morocco
| | - Koussa Tayeb
- Laboratory of Plant Biotechnology, Ecology and Ecosystem Valorization CNRST-URL10, Faculty of Sciences, University Chouaib Doukkali, El Jadida, Morocco
| | - Noura Omri Ben Youssef
- Field Crops Laboratory, National Institute for Agricultural Research of Tunisia, Tunisia, Tunisia
- National Institute of Agronomy of Tunisia, Tunis, Tunisia
| | - Mohamed Kharrat
- Field Crops Laboratory, National Institute for Agricultural Research of Tunisia, Tunisia, Tunisia
| | | | - Hatem Chaar
- Field Crops Laboratory, National Institute for Agricultural Research of Tunisia, Tunisia, Tunisia
- National Institute of Agronomy of Tunisia, Tunis, Tunisia
| | | |
Collapse
|
5
|
Feng B, Li P, Chen D, Ding C. Inhibition activity of tomato endophyte Bacillus velezensis FQ-G3 against postharvest Botrytis cinerea. Folia Microbiol (Praha) 2024; 69:361-371. [PMID: 37436591 DOI: 10.1007/s12223-023-01075-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 06/29/2023] [Indexed: 07/13/2023]
Abstract
Grey mold, caused by Botrytis cinerea, is a widespread and harmful disease of tomato. Biocontrol agents derived from endophytic bacteria are known to hold great potential for inhibition of phytopathogen. We conducted this study to explore the tomato endophytic strains with inhibition activity against B. cinerea. Endophytic strain Bacillus velezensis FQ-G3 exhibited excellent inhibition activity against B. cinerea. Inhibitory effects against B. cinerea were investigated both in vitro and in vivo. The in vitro assays displayed that FQ-G3 could significantly inhibit mycelia growth with inhibition rate of 85.93%, and delay conidia germination of B. cinerea. Tomato fruit inoculated with B. velezensis FQ-G3 revealed lower grey mold during treatment. The antifungal activity was attributed to activation of defense-related enzymes, as evidenced by the higher levels of peroxidase, polyphenol oxidase, and phenylalanine ammonia lyase in tomatoes after inoculation. In addition, scanning electron microscope was applied to elucidate the interaction between endophytes and pathogen, and bacterial colonization and antibiosis appeared to be the underlying mechanisms that FQ-G3 could suppress growth of B. cinerea. Collectively, our present results suggested that FQ-G3 may potentially be useful as a biocontrol agent in postharvest tomatoes.
Collapse
Affiliation(s)
- Baozhen Feng
- Key Laboratory of Plant Disease and Pest Control, Department of Life Science, Yuncheng University, 044000, Yuncheng, People's Republic of China
| | - Peiqian Li
- Key Laboratory of Plant Disease and Pest Control, Department of Life Science, Yuncheng University, 044000, Yuncheng, People's Republic of China.
| | - Dandan Chen
- Key Laboratory of Plant Disease and Pest Control, Department of Life Science, Yuncheng University, 044000, Yuncheng, People's Republic of China
| | - Chunshuang Ding
- Key Laboratory of Plant Disease and Pest Control, Department of Life Science, Yuncheng University, 044000, Yuncheng, People's Republic of China
| |
Collapse
|
6
|
Liao J, Yuan Z, Wang X, Chen T, Qian K, Cui Y, Rong A, Zheng C, Liu Y, Wang D, Pan L. Magnesium oxide nanoparticles reduce clubroot by regulating plant defense response and rhizosphere microbial community of tumorous stem mustard ( Brassica juncea var. tumida). Front Microbiol 2024; 15:1370427. [PMID: 38572228 PMCID: PMC10989686 DOI: 10.3389/fmicb.2024.1370427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Accepted: 03/06/2024] [Indexed: 04/05/2024] Open
Abstract
Clubroot, caused by Plasmodiophora brassicae, is a major disease that significantly impairs the yield of cruciferous crops and causes significant economic losses across the globe. The prevention of clubroot, especially in tumorous stem mustard (without resistant varieties), are is limited and primarily relies on fungicides. Engineered nanoparticles have opened up new avenues for the management of plant diseases, but there is no report on their application in the prevention of clubroot. The results showed that the control efficacy of 500 mg/L MgO NPs against clubroot was 54.92%. However, when the concentration was increased to 1,500 and 2,500 mg/L, there was no significant change in the control effect. Compared with CK, the average fresh and dry weight of the aerial part of plants treated with MgO NPs increased by 392.83 and 240.81%, respectively. Compared with the F1000 treatment, increases were observed in the content of soil available phosphorus (+16.72%), potassium (+9.82%), exchangeable magnesium (+24.20%), and water-soluble magnesium (+20.64%) in the 1,500 mg/L MgO NPs treatment. The enzyme-linked immune sorbent assay (ELISA) results showed that the application of MgO NPs significantly increased soil peroxidase (POD, +52.69%), alkaline protease (AP, +41.21%), alkaline phosphatase (ALP, +79.26%), urease (+52.69%), and sucrase (+56.88%) activities; And also increased plant L-phenylalanine ammonla-lyase (PAL, +70.49%), polyphenol oxidase (PPO, +36.77%), POD (+38.30%), guaiacol peroxidase (POX, +55.46%) activities and salicylic acid (SA, +59.86%) content. However, soil and plant catalase (CAT, -27.22 and - 19.89%, respectively), and plant super oxidase dismutase (SOD, -36.33%) activities were significantly decreased after the application of MgO NPs. The metagenomic sequencing analysis showed that the MgO NPs treatments significantly improved the α-diversity of the rhizosphere soil microbial community. The relative abundance of beneficial bacteria genera in the rhizosphere soil, including Pseudomonas, Sphingopyxis, Acidovorax, Variovorax, and Bosea, was significantly increased. Soil metabolic functions, such as oxidative phosphorylation (ko00190), carbon fixation pathways in prokaryotes (ko00720), indole alkaloid biosynthesis (ko00901), and biosynthesis of various antibiotics (ko00998) were significantly enriched. These results suggested that MgO NPs might control clubroot by promoting the transformation and utilization of soil nutrients, stimulating plant defense responses, and enriching soil beneficial bacteria.
Collapse
Affiliation(s)
- Jingjing Liao
- School of Advanced Agriculture and Bioengineering, Yangtze Normal University, Chongqing, China
| | - Zitong Yuan
- College of Plant Protection, Southwest University, Chongqing, China
| | - Xiangmei Wang
- School of Advanced Agriculture and Bioengineering, Yangtze Normal University, Chongqing, China
| | - Tingting Chen
- School of Advanced Agriculture and Bioengineering, Yangtze Normal University, Chongqing, China
| | - Kun Qian
- College of Plant Protection, Southwest University, Chongqing, China
| | - Yuanyuan Cui
- School of Advanced Agriculture and Bioengineering, Yangtze Normal University, Chongqing, China
| | - Anping Rong
- School of Advanced Agriculture and Bioengineering, Yangtze Normal University, Chongqing, China
| | - Chunyang Zheng
- School of Advanced Agriculture and Bioengineering, Yangtze Normal University, Chongqing, China
| | - Yuanxiu Liu
- School of Advanced Agriculture and Bioengineering, Yangtze Normal University, Chongqing, China
| | - Diandong Wang
- School of Advanced Agriculture and Bioengineering, Yangtze Normal University, Chongqing, China
| | - Limei Pan
- School of Advanced Agriculture and Bioengineering, Yangtze Normal University, Chongqing, China
| |
Collapse
|
7
|
Gillon A, Abdelrahman O, Abou‐Mansour E, L'Haridon F, Falquet L, Allard P, Weisskopf L. Comparative genomic and metabolomic study of three Streptomyces sp. differing in biological activity. Microbiologyopen 2023; 12:e1389. [PMID: 38129981 PMCID: PMC10616362 DOI: 10.1002/mbo3.1389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 09/13/2023] [Accepted: 10/18/2023] [Indexed: 12/23/2023] Open
Abstract
The Streptomyces genus is known to produce many specialized metabolites of value for medicine, but the potential of these metabolites in agronomy remains largely unexplored. In this study, we investigated three phylogenetically closely related Streptomyces strains (B5, B91, and B135) isolated from three distinct soil samples in Sudan. Despite belonging to the same species, these strains exhibited different ranges of Phytophthora infestans inhibition. The objective of this work was to identify the active compound(s) responsible for the inhibition of P. infestans and of other plant pathogens by comparing the genomes and metabolomes of the three strains which showed distinct activity patterns: B5 was the strongest inhibitor of oomycetes, B5 and B91 both inhibited most fungi and B135 was the only strain showing antibacterial activity. Our comparative genomic and metabolomic analysis identified borrelidin as the bioactive compound underlying B5's strong anti-oomycete activity and highlighted a few other metabolites as putative candidates underlying the strains' antifungal and antibacterial activities. This study illustrates the power of comparative genomics and metabolomics on phylogenetically closely related strains of differing activities to highlight bioactive compounds that could contribute to new sustainable crop protection strategies.
Collapse
Affiliation(s)
- Alisson Gillon
- Department of BiologyUniversity of FribourgFribourgSwitzerland
| | - Ola Abdelrahman
- Department of BiologyUniversity of FribourgFribourgSwitzerland
- Department of BotanyUniversity of KhartoumKhartoumSudan
| | | | | | - Laurent Falquet
- Department of BiologyUniversity of FribourgFribourgSwitzerland
- Genes and genomesSwiss Institute of BioinformaticsLausanneSwitzerland
| | | | - Laure Weisskopf
- Department of BiologyUniversity of FribourgFribourgSwitzerland
| |
Collapse
|
8
|
Wang W, Long Y. A review of biocontrol agents in controlling late blight of potatoes and tomatoes caused by Phytophthora infestans and the underlying mechanisms. PEST MANAGEMENT SCIENCE 2023; 79:4715-4725. [PMID: 37555293 DOI: 10.1002/ps.7706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 07/25/2023] [Accepted: 08/09/2023] [Indexed: 08/10/2023]
Abstract
Phytophthora infestans causes late blight on potatoes and tomatoes, which has a significant economic impact on agriculture. The management of late blight has been largely dependent on the application of synthetic fungicides, which is not an ultimate solution for sustainable agriculture and environmental safety. Biocontrol strategies are expected to be alternative methods to the conventional chemicals in controlling plant diseases in the integrated pest management (IPM) programs. Well-studied biocontrol agents against Phytophthora infestans include fungi, oomycetes, bacteria, and compounds produced by these antagonists, in addition to certain bioactive metabolites produced by plants. Laboratory and glasshouse experiments suggest a potential for using biocontrol in practical late blight disease management. However, the transition of biocontrol to field applications is problematic for the moment, due to low and variable efficacies. In this review, we provide a comprehensive summary on these biocontrol strategies and the underlying corresponding mechanisms. To give a more intuitive understanding of the promising biocontrol agents against Phytophthora infestans in agricultural systems, we discuss the utilizations, modes of action and future potentials of these antagonists based on their taxonomic classifications. To achieve a goal of best possible results produced by biocontrol agents, it is suggested to work on field trials, strain modifications, formulations, regulations, and optimizations of application. Combined biocontrol agents having different modes of action or biological adaptation traits may be used to strengthen the biocontrol efficacy. More importantly, biological control agents should be applied in the coordination of other existing and forthcoming methods in the IPM programs. © 2023 Society of Chemical Industry.
Collapse
Affiliation(s)
- Weizhen Wang
- Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang, China
| | - Youhua Long
- Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang, China
| |
Collapse
|
9
|
Wekesa TB, Wafula EN, Kavesu N, Sangura RM. Taxonomical, functional, and cytopathological characterization of Bacillus spp. from Lake Magadi, Kenya, against Rhizoctonia solani Kühn in Phaseolus vulgaris L. J Basic Microbiol 2023; 63:1293-1304. [PMID: 37310378 DOI: 10.1002/jobm.202300038] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 05/03/2023] [Accepted: 05/24/2023] [Indexed: 06/14/2023]
Abstract
A decline in common bean production and the ineffectiveness of synthetic chemical products in managing plant pathogens has led to exploiting Kenyan soda lakes as an alternative search for biocontrol agents. This study aimed to identify phylogenetically Bacillus spp. from Lake Magadi and their antagonistic activity against Rhizoctonia solani under in vitro and in vivo conditions. The 16 S ribosomal RNA (rRNA) subunit sequences of six bacterial strains isolated from Lake Magadi showed diversity similar to the Bacillus genus; Bacillus velezensis, Bacillus subtilis, and Bacillus pumilus. In vitro, antagonism showed varied mycelium inhibition rates of fungi in the coculture method. Enzymatic assays showed the varied ability of isolates to produce phosphatase, pectinase, chitinase, protease, indole-3-acetic acid (IAA), and hydrogen cyanide (HCD). The in vivo assay showed M09 (B. velezensis) with the lowest root mortality and incidence of postemergence wilt. Pre-emergence wilt incidence was recorded as lowest in M10 (B. subtilis). Isolate M10 had the highest phenylalanine ammonia-lyase (PAL) for defense enzymes, while polyphenol oxidase (PPO) and peroxidase were recorded as highest in M09. For the phenolic content, M10 recorded the highest phenolic content. In conclusion, Lake Magadi harbors Bacillus spp, which can be used as a potential biocontrol of R. solani.
Collapse
Affiliation(s)
- Tofick B Wekesa
- Institute of Biotechnology Research, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
| | - Eliud N Wafula
- Department of Physical and Biological Sciences, Bomet University College, Bomet, Kenya
| | - Ndinda Kavesu
- Institute of Biotechnology Research, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
| | - Robert M Sangura
- Department of Management Science and Entrepreneurship, Bomet University College, Bomet, Kenya
| |
Collapse
|
10
|
Buffi M, Cailleau G, Kuhn T, Li Richter XY, Stanley CE, Wick LY, Chain PS, Bindschedler S, Junier P. Fungal drops: a novel approach for macro- and microscopic analyses of fungal mycelial growth. MICROLIFE 2023; 4:uqad042. [PMID: 37965130 PMCID: PMC10642649 DOI: 10.1093/femsml/uqad042] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 10/11/2023] [Accepted: 10/17/2023] [Indexed: 11/16/2023]
Abstract
This study presents an inexpensive approach for the macro- and microscopic observation of fungal mycelial growth. The 'fungal drops' method allows to investigate the development of a mycelial network in filamentous microorganisms at the colony and hyphal scales. A heterogeneous environment is created by depositing 15-20 µl drops on a hydrophobic surface at a fixed distance. This system is akin to a two-dimensional (2D) soil-like structure in which aqueous-pockets are intermixed with air-filled pores. The fungus (spores or mycelia) is inoculated into one of the drops, from which hyphal growth and exploration take place. Hyphal structures are assessed at different scales using stereoscopic and microscopic imaging. The former allows to evaluate the local response of regions within the colony (modular behaviour), while the latter can be used for fractal dimension analyses to describe the hyphal network architecture. The method was tested with several species to underpin the transferability to multiple species. In addition, two sets of experiments were carried out to demonstrate its use in fungal biology. First, mycelial reorganization of Fusarium oxysporum was assessed as a response to patches containing different nutrient concentrations. Second, the effect of interactions with the soil bacterium Pseudomonas putida on habitat colonization by the same fungus was assessed. This method appeared as fast and accessible, allowed for a high level of replication, and complements more complex experimental platforms. Coupled with image analysis, the fungal drops method provides new insights into the study of fungal modularity both macroscopically and at a single-hypha level.
Collapse
Affiliation(s)
- Matteo Buffi
- Laboratory of Microbiology, University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
| | - Guillaume Cailleau
- Laboratory of Microbiology, University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
| | - Thierry Kuhn
- Laboratory of Microbiology, University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
- Laboratory of Eco-Ethology, University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
| | - Xiang-Yi Li Richter
- Laboratory of Microbiology, University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
- Laboratory of Eco-Ethology, University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
| | - Claire E Stanley
- Department of Bioengineering, Imperial College London, B304, Bessemer Building, South Kensington Campus, SW7 2AZ, London, United Kingdom
| | - Lukas Y Wick
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, Permoserstrasse 15, 04318 Leipzig, Germany
| | - Patrick S Chain
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, P.O. Box 1663, NM 87545, United States
| | - Saskia Bindschedler
- Laboratory of Microbiology, University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
| | - Pilar Junier
- Laboratory of Microbiology, University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
| |
Collapse
|
11
|
Gómez-Pérez D, Schmid M, Chaudhry V, Hu Y, Velic A, Maček B, Ruhe J, Kemen A, Kemen E. Proteins released into the plant apoplast by the obligate parasitic protist Albugo selectively repress phyllosphere-associated bacteria. THE NEW PHYTOLOGIST 2023; 239:2320-2334. [PMID: 37222268 DOI: 10.1111/nph.18995] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 04/11/2023] [Indexed: 05/25/2023]
Abstract
Biotic and abiotic interactions shape natural microbial communities. The mechanisms behind microbe-microbe interactions, particularly those protein based, are not well understood. We hypothesize that released proteins with antimicrobial activity are a powerful and highly specific toolset to shape and defend plant niches. We have studied Albugo candida, an obligate plant parasite from the protist Oomycota phylum, for its potential to modulate the growth of bacteria through release of antimicrobial proteins into the apoplast. Amplicon sequencing and network analysis of Albugo-infected and uninfected wild Arabidopsis thaliana samples revealed an abundance of negative correlations between Albugo and other phyllosphere microbes. Analysis of the apoplastic proteome of Albugo-colonized leaves combined with machine learning predictors enabled the selection of antimicrobial candidates for heterologous expression and study of their inhibitory function. We found for three candidate proteins selective antimicrobial activity against Gram-positive bacteria isolated from A. thaliana and demonstrate that these inhibited bacteria are precisely important for the stability of the community structure. We could ascribe the antibacterial activity of the candidates to intrinsically disordered regions and positively correlate it with their net charge. This is the first report of protist proteins with antimicrobial activity under apoplastic conditions that therefore are potential biocontrol tools for targeted manipulation of the microbiome.
Collapse
Affiliation(s)
- Daniel Gómez-Pérez
- Microbial Interactions in Plant Ecosystems, Center for Plant Molecular Biology, University of Tübingen, 72076, Tübingen, Germany
| | - Monja Schmid
- Microbial Interactions in Plant Ecosystems, Center for Plant Molecular Biology, University of Tübingen, 72076, Tübingen, Germany
| | - Vasvi Chaudhry
- Microbial Interactions in Plant Ecosystems, Center for Plant Molecular Biology, University of Tübingen, 72076, Tübingen, Germany
| | - Yiheng Hu
- Microbial Interactions in Plant Ecosystems, Center for Plant Molecular Biology, University of Tübingen, 72076, Tübingen, Germany
| | - Ana Velic
- Department of Biology, Quantitative Proteomics Group, Interfaculty Institute of Cell Biology, University of Tübingen, 72076, Tübingen, Germany
| | - Boris Maček
- Department of Biology, Quantitative Proteomics Group, Interfaculty Institute of Cell Biology, University of Tübingen, 72076, Tübingen, Germany
| | - Jonas Ruhe
- Max Planck Institute for Plant Breeding Research, 50829, Cologne, Germany
| | - Ariane Kemen
- Microbial Interactions in Plant Ecosystems, Center for Plant Molecular Biology, University of Tübingen, 72076, Tübingen, Germany
| | - Eric Kemen
- Microbial Interactions in Plant Ecosystems, Center for Plant Molecular Biology, University of Tübingen, 72076, Tübingen, Germany
| |
Collapse
|
12
|
Demarquest G, Lajoie G. Bacterial endophytes of sugar maple leaves vary more idiosyncratically than epiphytes across a large geographic area. FEMS Microbiol Ecol 2023; 99:fiad079. [PMID: 37442613 DOI: 10.1093/femsec/fiad079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 07/04/2023] [Accepted: 07/12/2023] [Indexed: 07/15/2023] Open
Abstract
Bacteria from the leaf surface and the leaf tissue have been attributed with several beneficial properties for their plant host. Though physically connected, the microbial ecology of these compartments has mostly been studied separately such that we lack an integrated understanding of the processes shaping their assembly. We sampled leaf epiphytes and endophytes from the same individuals of sugar maple across the northern portion of its range to evaluate if their community composition was driven by similar processes within and across populations differing in plant traits and overall abiotic environment. Leaf compartment explained most of the variation in community diversity and composition across samples. Leaf epiphytic communities were driven more by host and site characteristics than endophytic communities, whose community composition was more idiosyncratic across samples. Our results suggest a greater importance of priority effects and opportunistic colonization in driving community assembly of leaf endophytes. Understanding the comparative assembly of bacterial communities at the surface and inside plant leaves may be particularly useful for leveraging their respective potential for improving the health of plants in natural and anthropized ecosystems.
Collapse
Affiliation(s)
- Garance Demarquest
- Institut de Recherche en Biologie Végétale, Université de Montréal, 4101 rue Sherbrooke E, H1X 2B2 Montréal, Canada
- Université de Rennes, Agro-Campus Ouest, 65 Rue de Saint-Brieuc, 35042 Rennes, France
| | - Geneviève Lajoie
- Institut de Recherche en Biologie Végétale, Université de Montréal, 4101 rue Sherbrooke E, H1X 2B2 Montréal, Canada
- Jardin Botanique de Montréal, 4101 rue Sherbrooke E, H1X 2B2 Montréal, Canada
| |
Collapse
|
13
|
Aleynova OA, Nityagovsky NN, Ananev AA, Suprun AR, Ogneva ZV, Dneprovskaya AA, Beresh AA, Tyunin AP, Dubrovina AS, Kiselev KV. The Endophytic Microbiome of Wild Grapevines Vitis amurensis Rupr. and Vitis coignetiae Pulliat Growing in the Russian Far East. PLANTS (BASEL, SWITZERLAND) 2023; 12:2952. [PMID: 37631163 PMCID: PMC10460016 DOI: 10.3390/plants12162952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 08/10/2023] [Accepted: 08/13/2023] [Indexed: 08/27/2023]
Abstract
Many grape endophytic microorganisms exhibit high potential for suppressing the development of grape diseases and stimulating grapevine growth and fitness, as well as beneficial properties of the crop. The microbiome of wild grapevines is a promising source of biocontrol agents, which can be beneficial for domesticated grapevines. Using next-generation sequencing (NGS) and classical microbiology techniques, we performed an analysis of bacterial and fungal endophytic communities of wild grapevines Vitis amurensis Rupr. and Vitis coignetiae Pulliat growing in the Russian Far East. According to the NGS analysis, 24 and 18 bacterial taxa from the class level were present in V. amurensis and V. coignetiae grapevines, respectively. Gammaproteobacteria (35%) was the predominant class of endophytic bacteria in V. amurensis and Alphaproteobacteria (46%) in V. coignetiae. Three taxa, namely Sphingomonas, Methylobacterium, and Hymenobacter, were the most common bacterial genera for V. amurensis and V. coignetiae. Metagenomic analysis showed the presence of 23 and 22 fungi and fungus-like taxa of class level in V. amurensis and V. coignetiae, respectively. The predominant fungal classes were Dothideomycetes (61-65%) and Tremellomycetes (10-11%), while Cladosporium and Aureobasidium were the most common fungal genera in V. amurensis and V. coignetiae, respectively. A comparative analysis of the endophytic communities of V. amurensis and V. coignetiae with the previously reported endophytic communities of V. vinifera revealed that the bacterial biodiversity of V. amurensis and V. coignetiae was similar in alpha diversity to V. vinifera's bacterial biodiversity. The fungal alpha diversity of V. amurensis and V. coignetiae was statistically different from that of V. vinifera. The beta diversity analysis of bacterial and fungal endophytes showed that samples of V. vinifera formed separate clusters, while V. amurensis samples formed a separate cluster including V. coignetiae samples. The data revealed that the endophytic community of bacteria and fungi from wild V. amurensis was richer than that from V. coignetiae grapes and cultivated V. vinifera grapes. Therefore, the data obtained in this work could be of high value in the search for potentially useful microorganisms for viticulture.
Collapse
Affiliation(s)
- Olga A. Aleynova
- Laboratory of Biotechnology, Federal Scientific Center of the East 27Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
| | - Nikolay N. Nityagovsky
- Laboratory of Biotechnology, Federal Scientific Center of the East 27Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
| | - Alexey A. Ananev
- Laboratory of Biotechnology, Federal Scientific Center of the East 27Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
| | - Andrey R. Suprun
- Laboratory of Biotechnology, Federal Scientific Center of the East 27Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
| | - Zlata V. Ogneva
- Laboratory of Biotechnology, Federal Scientific Center of the East 27Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
| | - Alina A. Dneprovskaya
- Laboratory of Biotechnology, Federal Scientific Center of the East 27Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
- The School of Natural Sciences, Far Eastern Federal University, 690090 Vladivostok, Russia
| | - Alina A. Beresh
- Laboratory of Biotechnology, Federal Scientific Center of the East 27Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
- The School of Natural Sciences, Far Eastern Federal University, 690090 Vladivostok, Russia
| | - Alexey P. Tyunin
- Laboratory of Biotechnology, Federal Scientific Center of the East 27Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
| | - Alexandra S. Dubrovina
- Laboratory of Biotechnology, Federal Scientific Center of the East 27Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
| | - Konstantin V. Kiselev
- Laboratory of Biotechnology, Federal Scientific Center of the East 27Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
| |
Collapse
|
14
|
Hussain K, Ahmad R, Nuñez MA, Dar TUH, Rashid I, Khuroo AA. Plant invasion shifts soil microbiome and physico-chemical attributes along an elevational gradient in Kashmir Himalaya. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:84283-84299. [PMID: 37358769 DOI: 10.1007/s11356-023-28197-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 06/06/2023] [Indexed: 06/27/2023]
Abstract
Soil microbial communities, being situated at the interface of aboveground plant and belowground soil systems, can play a pivotal role in determining ecosystem response to the drivers of global environmental change, including invasive species. In mountains, invasive plants occurring along elevational gradients offer a unique natural experimental system to investigate the impact of invasions in determining patterns and relationships of soil microbial diversity and nutrient pools at much shorter spatial distances. Here, we studied the impact of a global plant invader, Leucanthemum vulgare, on the diversity of soil microbiome and physico-chemical attributes along an elevational gradient (1760-2880 m) in Kashmir Himalaya. We used Illumina MiSeq platform to characterize the soil microbiome in pair-wise invaded and uninvaded plots at four different sites along the gradient. We found a total of 1959 bacterial operational taxonomic units (OTUs) belonging to 152 species, and a relatively higher number of 2475 fungal OTUs belonging to 589 species. The α-diversity of soil microbiome showed a gradual increase from low to high elevation and differed significantly (p < 0.05) between the invaded and uninvaded plots. The β-diversity revealed distinct microbiome clustering among the sampling sites. Plant invasion also altered soil physico-chemical attributes along the elevational gradient. Overall, our findings suggest that the L. vulgare-induced shifts in soil microbiome and nutrient pools may be a belowground self-reinforced mechanism to facilitate its successful invasion along the elevational gradient. Our study provides new insights into invasive plant-microbe relationships with wide implications for climate warming-driven elevational range shifts in mountains.
Collapse
Affiliation(s)
- Khalid Hussain
- Centre for Biodiversity & Taxonomy, Department of Botany, University of Kashmir, Srinagar, 190 006, Jammu and Kashmir, India
| | - Rameez Ahmad
- Centre for Biodiversity & Taxonomy, Department of Botany, University of Kashmir, Srinagar, 190 006, Jammu and Kashmir, India
| | - Martin A Nuñez
- Department of Biology and Biochemistry, University of Houston, Houston, TX, 77204, USA
| | - Tanvir Ul Hassan Dar
- Department of Biotechnology, School of Biosciences and Biotechnology, BGSB University, Rajouri, 185234, Jammu and Kashmir, India
| | - Irfan Rashid
- Biological Invasions Laboratory, Department of Botany, University of Kashmir, Srinagar, 190 006, Jammu and Kashmir, India
| | - Anzar Ahmad Khuroo
- Centre for Biodiversity & Taxonomy, Department of Botany, University of Kashmir, Srinagar, 190 006, Jammu and Kashmir, India.
| |
Collapse
|
15
|
Andreolli M, Lampis S, Tosi L, Marano V, Zapparoli G. Fungicide sensitivity of grapevine bacteria with plant growth-promoting traits and antagonistic activity as non-target microorganisms. World J Microbiol Biotechnol 2023; 39:121. [PMID: 36929028 PMCID: PMC10020324 DOI: 10.1007/s11274-023-03569-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 03/07/2023] [Indexed: 03/18/2023]
Abstract
This study evaluates the capacity of commercial formulations of synthetic fungicides to inhibit grapevine bacterial growth when sprayed on vineyards to control diseases, such as downy mildew, powdery mildew and secondary rots. Fungicide sensitivity plate assays were carried out on bacteria isolated from vineyards that were also identified and characterized for their plant growth-promoting (PGP) traits and antifungal activity. The high taxonomic variability of bacteria screened with different chemical classes of fungicides is one new finding of this study. Seven out of 11 fungicides were able to inhibit the growth of bacteria at a concentration corresponding to the maximum dose allowed by law in spray treatments of vineyards. Bacterial sensitivity to each fungicide varied greatly. Many sensitive isolates displayed PGP traits and/or antagonistic activity. This study shows the potential impact of fungicidal treatments on grapevine bacterial microbiota. The involvement of bacteria beneficial to the growth and health of plants underlines the importance of this investigation. Our data reveal that the control of a certain disease may be possible using fungicides that have no or low impact on natural non-target microbiota. Understanding the action mechanisms of the active ingredients in these products is a priority for the development of new eco-friendly pesticides.
Collapse
Affiliation(s)
- Marco Andreolli
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, Verona, 37134, Italy
| | - Silvia Lampis
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, Verona, 37134, Italy
| | - Lorenzo Tosi
- AGREA Centro Studi, San Giovanni Lupatoto, Italy
| | - Viviana Marano
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, Verona, 37134, Italy
| | - Giacomo Zapparoli
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, Verona, 37134, Italy.
| |
Collapse
|
16
|
Miotto Vilanova LC, Rondeau M, Robineau M, Guise JF, Lavire C, Vial L, Fontaine F, Clément C, Jacquard C, Esmaeel Q, Aït Barka E, Sanchez L. Paraburkholderia phytofirmans PsJN delays Botrytis cinerea development on grapevine inflorescences. Front Microbiol 2022; 13:1030982. [DOI: 10.3389/fmicb.2022.1030982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 10/03/2022] [Indexed: 11/13/2022] Open
Abstract
Grapevine flowering is an important stage in the epidemiology of Botrytis cinerea, the causal agent of gray mold disease. To prevent infection and to minimize postharvest losses, the control of this necrotrophic fungus is mainly based on chemical fungicides application. However, there is a growing interest in other control alternatives. Among them, the use of beneficial microorganisms appears as an eco-friendly strategy. This study aims to investigate the effect of Paraburkholderia phytofirmans PsJN, root-inoculated or directly sprayed on fruiting cuttings inflorescences to control B. cinerea growth. For this purpose, quantification by real time PCR of Botrytis development, direct effect of PsJN on fungal spore germination and chemotaxis were assayed. Our results showed a significant protective effect of PsJN only by direct spraying on inflorescences. Moreover, we demonstrated an inhibition exerted by PsJN on Botrytis spore germination, effective when there was a direct contact between the two microorganisms. This study showed that PsJN is positively attracted by the pathogenic fungus B. cinerea and forms a biofilm around the fungal hyphae in liquid co-culture. Finally, microscopic observations on fruit cuttings revealed a co-localization of both beneficial and pathogenic microorganisms on grapevine receptacle and stigma that might be correlated with the protective effect induced by PsJN against B. cinerea via a direct antimicrobial effect. Taking together, our findings allowed us to propose PsJN as a biofungicide to control grapevine gray mold disease.
Collapse
|
17
|
Li P, Feng B, Yao Z, Wei B, Zhao Y, Shi S. Antifungal Activity of Endophytic Bacillus K1 Against Botrytis cinerea. Front Microbiol 2022; 13:935675. [PMID: 35935203 PMCID: PMC9355035 DOI: 10.3389/fmicb.2022.935675] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 06/10/2022] [Indexed: 11/23/2022] Open
Abstract
Gray mold caused by Botrytis cinerea is detrimental to plants and fruits. Endophytes have been shown to modify plant disease severity in functional assays. We conducted this study to investigate the endophytic strain Bacillus K1 with excellently antagonistic B. cinerea from the wild grape endosphere. We identified a wild grape endophytic strain K1 with high antifungal activity against B. cinerea both in vitro and in vivo. Combining the phylogenetic results based on 16S rDNA and genome sequencing, K1 was assigned as Bacillus subtilis. The in vitro results displayed that K1 and its volatile substances could significantly inhibit the mycelia growth of B. cinerea. Grape fruit inoculated with Bacillus K1 showed lower gray mold during treatment. The higher levels of defense-related enzymes, including peroxidase, polyphenol oxidase, and phenylalanine ammonia lyase, were induced in grapes after inoculation. Scanning electron microscopy (SEM) suggested that K1 inhibited mycelial growth via bacterial colonization and antibiosis in grapes. The gas chromatography–mass spectrometry analysis identified 33 volatiles in which dibutyl phthalate was the major compound accounting for 74.28%. Dibutyl phthalate demonstrated strong activity in suppressing the mycelia growth of B. cinerea. Genome bioinformatics analysis revealed that the K1 chromosome harbored many known biosynthesis gene clusters encoding subtilosin, bacillaene, bacillibactin, bacilysin, and fengycin. This study provides a potential biological agent to control diseases of post-harvest grape fruit and improves our understanding of the possible biocontrol mechanisms of the Bacillus strain.
Collapse
|
18
|
Zhang Y, Zhang J, Yan C, Fang M, Wang L, Huang Y, Wang F. Metabolome and Microbiome Signatures in the Leaves of Wild Tea Plant Resources Resistant to Pestalotiopsis theae. Front Microbiol 2022; 13:907962. [PMID: 35910661 PMCID: PMC9335280 DOI: 10.3389/fmicb.2022.907962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 05/23/2022] [Indexed: 11/28/2022] Open
Abstract
Tea (Camellia sinensis) is an important crop that is mainly used in the food industry. This study using the metabolome and microbiome investigates the resistance factors of wild tea plant resources against tea gray blight disease, which is caused by Pestalotiopsis theae (Sawada) Steyaert. According to the interaction analysis of tea leaves and pathogenic fungus, the resistance of wild tea plant resource “R1” (Resistance 1) to tea gray blight disease was significantly higher than that of wild tea plant resource “S1” (Susceptibility 1). The difference between “R1” and “S1” in the metabolome was obvious. There were 145 metabolites that significantly changed. The phenolic acids and flavonoids were the major increased categories in “R1,” and it included 4-O-glucosyl-sinapate and petunidin-3-o-(6”-o-p-coumaroyl) rutinoside. Six metabolic pathways were significantly enriched, including aminoacyl-tRNA biosynthesis, flavone, and flavonol biosynthesis. In terms of bacteria, there was no significant difference between “S1” and “R1” in the principal component analysis (PCA). Pseudomonas was the major bacterial genus in “S1” and “R1.” In addition, each of the two resources had its own predominant genus: Cellvibirio was a predominant bacterial genus in “S1” and Candidatus_competibacter was a predominant bacterial genus in “R1.” In terms of fungi, the fungal diversity and the abundance of the two tea plant resource samples could be distinguished clearly. The fungal component of “S1” was more abundant than that of “R1” at the genus level. Toxicocladosporium was the predominant fungal genus of “S1,” and Filobasidium was the predominant fungal genus of “R1.” The relative abundance of unclassified-norank-norank-Chloroplast and Penicillium were significantly different between “S1” and “R1.” Penicillium was identified as a potential biomarker. They correlated with some metabolites enriched in “S1” or “R1,” such as L-arginine and quercetin-3-o-(2”-o-rhamnosyl) rutinoside-7-o-glucoside. Overall, phenolic acids, flavonoids, and Penicillium could be functional metabolites or microorganisms that contributed to improving the resistance of wild tea plant resources to tea gray blight disease.
Collapse
Affiliation(s)
- Yuqian Zhang
- College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Jie Zhang
- Henan Key Laboratory of Tea Plant Comprehensive Utilization in South Henan, College of Tea Science, Xinyang Agriculture and Forestry University, Xinyang, China
| | - Changyu Yan
- College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Meishan Fang
- College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Lijie Wang
- College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Yahui Huang
- College of Horticulture, South China Agricultural University, Guangzhou, China
- Yahui Huang
| | - Feiyan Wang
- College of Horticulture, South China Agricultural University, Guangzhou, China
- *Correspondence: Feiyan Wang
| |
Collapse
|
19
|
Feng B, Chen D, Jin R, Li E, Li P. Bioactivities evaluation of an endophytic bacterial strain Bacillus velezensis JRX-YG39 inhabiting wild grape. BMC Microbiol 2022; 22:170. [PMID: 35780079 PMCID: PMC9250181 DOI: 10.1186/s12866-022-02584-0] [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: 05/22/2022] [Accepted: 06/24/2022] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Botrytis cinerea can cause serious disease on lots of plant hosts during growth and postharvest storage. Biocontrol is known to be eco-friendly methods to control pathogens. Plant endophytic bacteria are generally considered as beneficial organisms, since they can promote plant growth and enhance plant immune system. Thus, screening biological control agents is very important for sustainable plant protection. RESULTS Fifty-six endophytic bacteria were obtained from wild grape. Sixteen isolates and their extracts exhibited significant antifungal activity against B. cinerea. Particularly, strain JRX-YG39 with the strongest inhibition ability had a broad-spectrum antifungal activity. Combining 16S rDNA analysis and the phylogenetic results based on gyrA and gyrB genes, JRX-YG39 was assigned as Bacillus velezensis. JRX-YG39 could produce bioactive VOCs and obviously depressed mycelia growth of B. cinerea. It was confirmed that VOCs released by JRX-YG39 could significantly promote growth and induce defense of Arabidopsis thaliana. Thirty-one bioactive secondary metabolites were further identified from JRX-YG39 culture by gas chromatography-mass spectrometry analysis. Dibutyl phthalate, a potential antifungal substance, was the major compound accounting for 78.65%. CONCLUSIONS B. velezensis JRX-YG39 has wide broad-spectrum antagonistic activity and significant plant promotion activity. Hence, B. velezensis JRX-YG39 will provide a valuable constituent of modern agricultural practice as biofertilizers and biocontrol agents.
Collapse
Affiliation(s)
- Baozhen Feng
- Key Laboratory of Plant Disease and Pest Control, Department of Life Science, Yuncheng University, Yuncheng, 044000, People's Republic of China
| | - Dandan Chen
- Key Laboratory of Plant Disease and Pest Control, Department of Life Science, Yuncheng University, Yuncheng, 044000, People's Republic of China
| | - Ruixue Jin
- Key Laboratory of Plant Disease and Pest Control, Department of Life Science, Yuncheng University, Yuncheng, 044000, People's Republic of China
| | - Erqin Li
- Key Laboratory of Plant Disease and Pest Control, Department of Life Science, Yuncheng University, Yuncheng, 044000, People's Republic of China
| | - Peiqian Li
- Key Laboratory of Plant Disease and Pest Control, Department of Life Science, Yuncheng University, Yuncheng, 044000, People's Republic of China.
| |
Collapse
|
20
|
Abdelrahman O, Yagi S, El Siddig M, El Hussein A, Germanier F, De Vrieze M, L’Haridon F, Weisskopf L. Evaluating the Antagonistic Potential of Actinomycete Strains Isolated From Sudan’s Soils Against Phytophthora infestans. Front Microbiol 2022; 13:827824. [PMID: 35847058 PMCID: PMC9277107 DOI: 10.3389/fmicb.2022.827824] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 06/08/2022] [Indexed: 11/16/2022] Open
Abstract
Soil microorganisms play crucial roles in soil fertility, e.g., through decomposing organic matter, cycling nutrients or through beneficial interactions with plants. Actinomycetes are a major component of soil inhabitants; they are prolific producers of specialized metabolites, among which many antibiotics. Here we report the isolation and characterization of 175 Actinomycetes from rhizosphere and bulk soil samples collected in 18 locations in Sudan. We evaluated the strains’ metabolic potential for plant protection by testing their ability to inhibit the mycelial growth of the oomycete Phytophthora infestans, which is one of the most devastating plant pathogens worldwide. Most strains significantly reduced the oomycete’s growth in direct confrontational in vitro assays. A significant proportion of the tested strains (15%) were able to inhibit P. infestans to more than 80%, 23% to 50%–80%, while the remaining 62% had inhibition percentages lesser than 50%. Different morphologies of P. infestans mycelial growth and sporangia formation were observed upon co-inoculation with some of the Actinomycetes isolates, such as the production of fewer, thinner hyphae without sporangia leading to a faint growth morphology, or on the contrary, of clusters of thick-walled hyphae leading to a bushy, or “frozen” morphology. These morphologies were caused by strains differing in activity levels but phylogenetically closely related with each other. To evaluate whether the isolated Actinomycetes could also inhibit the pathogen’s growth in planta, the most active strains were tested for their ability to restrict disease progress in leaf disc and full plant assays. Five of the active strains showed highly significant protection of potato leaves against the pathogen in leaf disc assays, as well as substantial reduction of disease progress in full plants assays. Using cell-free filtrates instead of the bacterial spores also led to full protection against disease on leaf discs, which highlights the strong crop protective potential of the secreted metabolites that could be applied as leaf spray. This study demonstrates the strong anti-oomycete activity of soil- and rhizosphere-borne Actinomycetes and highlights their significant potential for the development of sustainable solutions based on either cell suspensions or cell-free filtrates to safeguard potatoes from their most damaging pathogen.
Collapse
Affiliation(s)
- Ola Abdelrahman
- Department of Biology, University of Fribourg, Fribourg, Switzerland
- Department of Botany, University of Khartoum, Khartoum, Sudan
| | - Sakina Yagi
- Department of Botany, University of Khartoum, Khartoum, Sudan
| | | | - Adil El Hussein
- Department of Botany, University of Khartoum, Khartoum, Sudan
| | - Fanny Germanier
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Mout De Vrieze
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | | | - Laure Weisskopf
- Department of Biology, University of Fribourg, Fribourg, Switzerland
- *Correspondence: Laure Weisskopf,
| |
Collapse
|
21
|
Estoppey A, Weisskopf L, Di Francesco E, Vallat-Michel A, Bindschedler S, Chain PS, Junier P. Improved methods to assess the effect of bacteria on germination of fungal spores. FEMS Microbiol Lett 2022; 369:6553822. [PMID: 35325127 DOI: 10.1093/femsle/fnac034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 12/08/2021] [Accepted: 03/22/2022] [Indexed: 11/13/2022] Open
Abstract
Bacterial-fungal interactions (BFI) play a major role on ecosystem functioning and might be particularly relevant at a specific development stage. For instance, in the case of biological control of fungal pathogens by bacteria, a highly relevant kind of BFI, in-vitro experiments often assess the impact of a bacterium on the inhibition of actively growing mycelia. However, this fails to consider other stages of plant infection such as the germination of a spore or a sclerotium. This study aims to present novel experimental platforms for in-vitro experiments with fungal spores, in order to assess the effect of bacteria on germination and fungal growth control, to recover the metabolites produced in the interaction, and to enhance direct visualisation of BFI. Botrytis cinerea, a phytopathogenic fungus producing oxalic acid (OA) as pathogenicity factor, was used as model. Given that oxalotrophic bacteria have been shown previously to control the growth of B. cinerea, the oxalotrophic bacteria Cupriavidus necator and Cupriavidus oxalaticus were used as models. The experiments performed demonstrated the suitability of the methods and confirmed that both bacteria were able to control the growth of B. cinerea, but only in media in which soluble OA was detected by the fungus. The methods presented here can be easily performed in any microbiology laboratory and are not only applicable to screen for potential biocontrol agents, but also to better understand BFI.
Collapse
Affiliation(s)
- Aislinn Estoppey
- Laboratory of Microbiology, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Laure Weisskopf
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Eva Di Francesco
- Laboratory of Microbiology, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Armelle Vallat-Michel
- Neuchâtel Platform of Analytical Chemistry, University of Neuchâtel, Neuchâtel, Switzerland
| | - Saskia Bindschedler
- Laboratory of Microbiology, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Patrick S Chain
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Pilar Junier
- Laboratory of Microbiology, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
| |
Collapse
|
22
|
Cobos R, Ibañez A, Diez-Galán A, Calvo-Peña C, Ghoreshizadeh S, Coque JJR. The Grapevine Microbiome to the Rescue: Implications for the Biocontrol of Trunk Diseases. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11070840. [PMID: 35406820 PMCID: PMC9003034 DOI: 10.3390/plants11070840] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 03/11/2022] [Accepted: 03/20/2022] [Indexed: 05/13/2023]
Abstract
Grapevine trunk diseases (GTDs) are one of the most devastating pathologies that threaten the survival and profitability of vineyards around the world. Progressive banning of chemical pesticides and their withdrawal from the market has increased interest in the development of effective biocontrol agents (BCAs) for GTD treatment. In recent years, considerable progress has been made regarding the characterization of the grapevine microbiome, including the aerial part microbiome (flowers, berries and leaves), the wood microbiome, the root environment and vineyard soil microbiomes. In this work, we review these advances especially in relation to the etiology and the understanding of the composition of microbial populations in plants affected by GTDs. We also discuss how the grapevine microbiome is becoming a source for the isolation and characterization of new, more promising BCAs that, in the near future, could become effective tools for controlling these pathologies.
Collapse
Affiliation(s)
- Rebeca Cobos
- Instituto de Investigación de la Viña y el Vino, Escuela de Ingeniería Agraria, Universidad de León, 24009 León, Spain; (R.C.); (A.I.); (A.D.-G.); (C.C.-P.); (S.G.)
| | - Ana Ibañez
- Instituto de Investigación de la Viña y el Vino, Escuela de Ingeniería Agraria, Universidad de León, 24009 León, Spain; (R.C.); (A.I.); (A.D.-G.); (C.C.-P.); (S.G.)
| | - Alba Diez-Galán
- Instituto de Investigación de la Viña y el Vino, Escuela de Ingeniería Agraria, Universidad de León, 24009 León, Spain; (R.C.); (A.I.); (A.D.-G.); (C.C.-P.); (S.G.)
| | - Carla Calvo-Peña
- Instituto de Investigación de la Viña y el Vino, Escuela de Ingeniería Agraria, Universidad de León, 24009 León, Spain; (R.C.); (A.I.); (A.D.-G.); (C.C.-P.); (S.G.)
| | - Seyedehtannaz Ghoreshizadeh
- Instituto de Investigación de la Viña y el Vino, Escuela de Ingeniería Agraria, Universidad de León, 24009 León, Spain; (R.C.); (A.I.); (A.D.-G.); (C.C.-P.); (S.G.)
| | - Juan José R. Coque
- Instituto de Investigación de la Viña y el Vino, Escuela de Ingeniería Agraria, Universidad de León, 24009 León, Spain; (R.C.); (A.I.); (A.D.-G.); (C.C.-P.); (S.G.)
- Área de Microbiología, Departamento de Biología Molecular, Universidad de León, 24071 León, Spain
- Correspondence: ; Tel.: +34-987291811
| |
Collapse
|
23
|
Major Biological Control Strategies for Plant Pathogens. Pathogens 2022; 11:pathogens11020273. [PMID: 35215215 PMCID: PMC8879208 DOI: 10.3390/pathogens11020273] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 02/10/2022] [Accepted: 02/11/2022] [Indexed: 12/04/2022] Open
Abstract
Food security has become a major concern worldwide in recent years due to ever increasing population. Providing food for the growing billions without disturbing environmental balance is incessantly required in the current scenario. In view of this, sustainable modes of agricultural practices offer better promise and hence are gaining prominence recently. Moreover, these methods have taken precedence currently over chemical-based methods of pest restriction and pathogen control. Adoption of Biological Control is one such crucial technique that is currently in the forefront. Over a period of time, various biocontrol strategies have been experimented with and some have exhibited great success and promise. This review highlights the different methods of plant-pathogen control, types of plant pathogens, their modus operandi and various biocontrol approaches employing a range of microorganisms and their byproducts. The study lays emphasis on the use of upcoming methodologies like microbiome management and engineering, phage cocktails, genetically modified biocontrol agents and microbial volatilome as available strategies to sustainable agricultural practices. More importantly, a critical analysis of the various methods enumerated in the paper indicates the need to amalgamate these techniques in order to improve the degree of biocontrol offered by them.
Collapse
|
24
|
Lammers A, Lalk M, Garbeva P. Air Ambulance: Antimicrobial Power of Bacterial Volatiles. Antibiotics (Basel) 2022; 11:antibiotics11010109. [PMID: 35052986 PMCID: PMC8772769 DOI: 10.3390/antibiotics11010109] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 01/09/2022] [Accepted: 01/11/2022] [Indexed: 12/19/2022] Open
Abstract
We are currently facing an antimicrobial resistance crisis, which means that a lot of bacterial pathogens have developed resistance to common antibiotics. Hence, novel and innovative solutions are urgently needed to combat resistant human pathogens. A new source of antimicrobial compounds could be bacterial volatiles. Volatiles are ubiquitous produced, chemically divers and playing essential roles in intra- and interspecies interactions like communication and antimicrobial defense. In the last years, an increasing number of studies showed bioactivities of bacterial volatiles, including antibacterial, antifungal and anti-oomycete activities, indicating bacterial volatiles as an exciting source for novel antimicrobial compounds. In this review we introduce the chemical diversity of bacterial volatiles, their antimicrobial activities and methods for testing this activity. Concluding, we discuss the possibility of using antimicrobial volatiles to antagonize the antimicrobial resistance crisis.
Collapse
Affiliation(s)
- Alexander Lammers
- Department of Cellular Biochemistry and Metabolomics, University of Greifswald, 17487 Greifswald, Germany;
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), 6708 PB Wageningen, The Netherlands
- Correspondence: or (A.L.); (P.G.)
| | - Michael Lalk
- Department of Cellular Biochemistry and Metabolomics, University of Greifswald, 17487 Greifswald, Germany;
| | - Paolina Garbeva
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), 6708 PB Wageningen, The Netherlands
- Correspondence: or (A.L.); (P.G.)
| |
Collapse
|
25
|
Fournier P, Pellan L, Barroso-Bergadà D, Bohan DA, Candresse T, Delmotte F, Dufour MC, Lauvergeat V, Le Marrec C, Marais A, Martins G, Masneuf-Pomarède I, Rey P, Sherman D, This P, Frioux C, Labarthe S, Vacher C. The functional microbiome of grapevine throughout plant evolutionary history and lifetime. ADV ECOL RES 2022. [DOI: 10.1016/bs.aecr.2022.09.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
26
|
Gupta R, Elkabetz D, Leibman-Markus M, Sayas T, Schneider A, Jami E, Kleiman M, Bar M. Cytokinin drives assembly of the phyllosphere microbiome and promotes disease resistance through structural and chemical cues. THE ISME JOURNAL 2022; 16:122-137. [PMID: 34272494 PMCID: PMC8692462 DOI: 10.1038/s41396-021-01060-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 06/24/2021] [Accepted: 07/05/2021] [Indexed: 02/06/2023]
Abstract
The plant hormone cytokinin (CK) is an important developmental regulator, promoting morphogenesis and delaying differentiation and senescence. From developmental processes, to growth, to stress tolerance, CKs are central in plant life. CKs are also known to mediate plant immunity and disease resistance, and several classes of microbes can also produce CKs, affecting the interaction with their plant hosts. While host species and genotype can be a driving force in shaping the plant microbiome, how plant developmental hormones such as CK can shape the microbiome is largely uninvestigated. Here, we examined the relationship between CK and the phyllosphere microbiome, finding that CK acts as a selective force in microbiome assembly, increasing richness, and promoting the presence of Firmicutes. CK-mediated immunity was found to partially depend on the microbial community, and bacilli isolated from previously described CK-rich plant genotypes, which overexpress a CK biosynthesis gene or have increased CK sensitivity, induced plant immunity, and promoted disease resistance. Using a biomimetic system, we investigated the relationship between the leaf microstructure, which is differentially patterned upon changes in CK content or signaling, and the growth of different phyllosphere microbes. We found that leaf structures derived from CK-rich plant genotypes support bacilli in the biomimetic system. CK was able to promote the growth, swarming, and biofilm formation of immunity inducing bacillus isolates in vitro. Overall, our results indicate that host genotype and hormonal profiles can act as a strong selective force in microbiome assembly, underlying differential immunity profiles, and pathogen resistance as a result.
Collapse
Affiliation(s)
- Rupali Gupta
- Department of Plant Pathology and Weed Research, Plant Protection Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
| | - Dorin Elkabetz
- Department of Plant Pathology and Weed Research, Plant Protection Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
- Department of Plant Pathology and Microbiology, Hebrew University of Jerusalem, Rehovot, Israel
| | - Meirav Leibman-Markus
- Department of Plant Pathology and Weed Research, Plant Protection Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
| | - Tali Sayas
- Department of Vegetable and Field crops, Plant Sciences Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
| | - Anat Schneider
- Department of Plant Pathology and Weed Research, Plant Protection Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
- Department of Plant Pathology and Microbiology, Hebrew University of Jerusalem, Rehovot, Israel
| | - Elie Jami
- Department of Ruminant Science, Animal Science Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
| | - Maya Kleiman
- Department of Vegetable and Field crops, Plant Sciences Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
- Agro-NanoTechnology and Advanced Materials Center, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
| | - Maya Bar
- Department of Plant Pathology and Weed Research, Plant Protection Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel.
| |
Collapse
|
27
|
Sullam KE, Musa T. Ecological Dynamics and Microbial Treatments against Oomycete Plant Pathogens. PLANTS 2021; 10:plants10122697. [PMID: 34961168 PMCID: PMC8707103 DOI: 10.3390/plants10122697] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 11/16/2021] [Accepted: 11/23/2021] [Indexed: 11/16/2022]
Abstract
In this review, we explore how ecological concepts may help assist with applying microbial biocontrol agents to oomycete pathogens. Oomycetes cause a variety of agricultural diseases, including potato late blight, apple replant diseases, and downy mildew of grapevine, which also can lead to significant economic damage in their respective crops. The use of microbial biocontrol agents is increasingly gaining interest due to pressure from governments and society to reduce chemical plant protection products. The success of a biocontrol agent is dependent on many ecological processes, including the establishment on the host, persistence in the environment, and expression of traits that may be dependent on the microbiome. This review examines recent literature and trends in research that incorporate ecological aspects, especially microbiome, host, and environmental interactions, into biological control development and applications. We explore ecological factors that may influence microbial biocontrol agents’ efficacy and discuss key research avenues forward.
Collapse
|
28
|
Ali M, Ali Q, Sohail MA, Ashraf MF, Saleem MH, Hussain S, Zhou L. Diversity and Taxonomic Distribution of Endophytic Bacterial Community in the Rice Plant and Its Prospective. Int J Mol Sci 2021; 22:ijms221810165. [PMID: 34576331 PMCID: PMC8465699 DOI: 10.3390/ijms221810165] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 09/06/2021] [Accepted: 09/16/2021] [Indexed: 11/16/2022] Open
Abstract
Endophytic bacterial communities are beneficial communities for host plants that exist inside the surfaces of plant tissues, and their application improves plant growth. They benefit directly from the host plant by enhancing the nutrient amount of the plant’s intake and influencing the phytohormones, which are responsible for growth promotion and stress. Endophytic bacteria play an important role in plant-growth promotion (PGP) by regulating the indirect mechanism targeting pest and pathogens through hydrolytic enzymes, antibiotics, biocontrol potential, and nutrient restriction for pathogens. To attain these benefits, firstly bacterial communities must be colonized by plant tissues. The nature of colonization can be achieved by using a set of traits, including attachment behavior and motility speed, degradation of plant polymers, and plant defense evasion. The diversity of bacterial endophytes colonization depends on various factors, such as plants’ relationship with environmental factors. Generally, each endophytic bacteria has a wide host range, and they are used as bio-inoculants in the form of synthetic applications for sustainable agriculture systems and to protect the environment from chemical hazards. This review discusses and explores the taxonomic distribution of endophytic bacteria associated with different genotypes of rice plants and their origin, movement, and mechanism of PGP. In addition, this review accentuates compressive meta data of endophytic bacteria communities associated with different genotypes of rice plants, retrieves their plant-growth-promoting properties and their antagonism against plant pathogens, and discusses the indication of endophytic bacterial flora in rice plant tissues using various methods. The future direction deepens the study of novel endophytic bacterial communities and their identification from rice plants through innovative techniques and their application for sustainable agriculture systems.
Collapse
Affiliation(s)
- Mohsin Ali
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Institute of Agro-Product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Qurban Ali
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
- Correspondence: (Q.A.); (L.Z.)
| | - Muhammad Aamir Sohail
- Center for Excellence in Molecular Plant Sciences, National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, 300 Fenglin Road, Shanghai 200032, China;
| | | | - Muhammad Hamzah Saleem
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China;
| | - Saddam Hussain
- Department of Agronomy, University of Agriculture, Faisalabad 38040, Punjab, Pakistan;
| | - Lei Zhou
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Institute of Agro-Product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;
- Correspondence: (Q.A.); (L.Z.)
| |
Collapse
|
29
|
Isolation and Characterization of Endophyte Bacillus velezensis KOF112 from Grapevine Shoot Xylem as Biological Control Agent for Fungal Diseases. PLANTS 2021; 10:plants10091815. [PMID: 34579349 PMCID: PMC8468208 DOI: 10.3390/plants10091815] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 08/27/2021] [Accepted: 08/27/2021] [Indexed: 12/05/2022]
Abstract
As the use of chemical fungicides has raised environmental concerns, biological control agents have attracted interest as an alternative to chemical fungicides for plant-disease control. In this study, we attempted to explore biological control agents for three fungal phytopathogens causing downy mildew, gray mold, and ripe rot in grapevines, which are derived from shoot xylem of grapevines. KOF112, which was isolated from the Japanese indigenous wine grape Vitis sp. cv. Koshu, inhibited mycelial growth of Botrytis cinerea, Colletotrichum gloeosporioides, and Phytophthora infestans. The KOF112-inhibited mycelial tips were swollen or ruptured, suggesting that KOF112 produces antifungal substances. Analysis of the 16S rDNA sequence revealed that KOF112 is a strain of Bacillus velezensis. Comparative genome analysis indicated significant differences in the synthesis of non-ribosomal synthesized antimicrobial peptides and polyketides between KOF112 and the antagonistic B. velezensis FZB42. KOF112 showed biocontrol activities against gray mold caused by B. cinerea, anthracnose by C. gloeosporioides, and downy mildew by Plasmopara viticola. In the KOF112–P. viticola interaction, KOF112 inhibited zoospore release from P. viticola zoosporangia but not zoospore germination. In addition, KOF112 drastically upregulated the expression of genes encoding class IV chitinase and β-1,3-glucanase in grape leaves, suggesting that KOF112 also works as a biotic elicitor in grapevine. Because it is considered that endophytic KOF112 can colonize well in and/or on grapevine, KOF112 may contribute to pest-management strategies in viticulture and potentially reduce the frequency of chemical fungicide application.
Collapse
|
30
|
Sundh I, Eilenberg J. Why has the authorization of microbial biological control agents been slower in the EU than in comparable jurisdictions? PEST MANAGEMENT SCIENCE 2021; 77:2170-2178. [PMID: 33201551 PMCID: PMC8048978 DOI: 10.1002/ps.6177] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 11/06/2020] [Accepted: 11/17/2020] [Indexed: 06/11/2023]
Abstract
The aim of this study was to identify reasons why the authorization of microbial pest control agents is lengthier under regulatory frameworks of the European Union (EU) than in comparable jurisdictions. A main conclusion is that although the EU's regulatory processes have strong scientific foundations, the most appropriate scientific concepts, knowledge and expertise have not been applied in the safety assessment of microorganisms and biological control. Tradition and conceptual legacies from assessments of conventional chemical pesticides have likely contributed to this by steering the evaluations of microorganisms in less appropriate directions. According to our investigation, the current framework for microbial plant protection products complies poorly with the principles that legislation should have legal predictability, proportionality, and that it should be non-discriminative, for instance in comparison to corresponding regulations in comparable jurisdictions. We also found that existing possibilities to take non-safety and ethical considerations into account can probably be used more. To rationalize the EU's authorization of microbial control products, both the basic legislation and the evaluations of agents and products need stronger rooting in fundamental microbiological science. © 2020 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
Collapse
Affiliation(s)
- Ingvar Sundh
- Department of Molecular SciencesSwedish University of Agricultural SciencesUppsalaSweden
| | - Jørgen Eilenberg
- Department of Plant and Environmental SciencesUniversity of CopenhagenFrederiksberg CDenmark
| |
Collapse
|
31
|
Andreolli M, Zapparoli G, Lampis S, Santi C, Angelini E, Bertazzon N. In Vivo Endophytic, Rhizospheric and Epiphytic Colonization of Vitis vinifera by the Plant-Growth Promoting and Antifungal Strain Pseudomonas protegens MP12. Microorganisms 2021; 9:microorganisms9020234. [PMID: 33498710 PMCID: PMC7910868 DOI: 10.3390/microorganisms9020234] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 01/20/2021] [Accepted: 01/21/2021] [Indexed: 01/24/2023] Open
Abstract
An evaluation was conducted of the colonization of Pseudomonas protegens MP12, a plant-growth promoting and antagonistic strain, inoculated in vine plants during a standard process of grapevine nursery propagation. Three in vivo inoculation protocols (endophytic, rhizospheric, and epiphytic) were implemented and monitored by means of both culture-dependent and independent techniques. Endophytic treatment resulted in the colonization of the bacterium inside the vine cuttings, which spread to young leaves during the forcing period. Microscopy analysis performed on transformed dsRed-tagged P. protegens MP12 cells confirmed the bacterium’s ability to penetrate the inner part of the roots. However, endophytic MP12 strain was no longer detected once the plant materials had been placed in the vine nursery field. The bacterium also displayed an ability to colonize the rhizosphere and, when the plants were uprooted at the end of the vegetative season, its persistence was confirmed. Epiphytic inoculation, performed by foliar spraying of cell suspension, was effective in controlling artificially-induced Botrytis cinerea infection in detached leaves. The success of rhizospheric and leaf colonization in vine plants suggests potential for the future exploitation of P. protegens MP12 as biofertilizer and biopesticide. Further investigation is required into the stability of the bacterium’s colonization of vine plants under real-world conditions in vineyards.
Collapse
Affiliation(s)
- Marco Andreolli
- Department of Biotechnology, University of Verona, 37134 Verona, Italy; (M.A.); (S.L.); (C.S.)
| | - Giacomo Zapparoli
- Department of Biotechnology, University of Verona, 37134 Verona, Italy; (M.A.); (S.L.); (C.S.)
- Correspondence: ; Tel.: +39-045-8027047
| | - Silvia Lampis
- Department of Biotechnology, University of Verona, 37134 Verona, Italy; (M.A.); (S.L.); (C.S.)
| | - Chiara Santi
- Department of Biotechnology, University of Verona, 37134 Verona, Italy; (M.A.); (S.L.); (C.S.)
| | - Elisa Angelini
- Research Centre for Viticulture and Enology, CREA, 31015 Conegliano, Italy; (E.A.); (N.B.)
| | - Nadia Bertazzon
- Research Centre for Viticulture and Enology, CREA, 31015 Conegliano, Italy; (E.A.); (N.B.)
| |
Collapse
|
32
|
Chaudhry V, Runge P, Sengupta P, Doehlemann G, Parker JE, Kemen E. Shaping the leaf microbiota: plant-microbe-microbe interactions. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:36-56. [PMID: 32910810 PMCID: PMC8210630 DOI: 10.1093/jxb/eraa417] [Citation(s) in RCA: 74] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 09/07/2020] [Indexed: 05/28/2023]
Abstract
The aerial portion of a plant, namely the leaf, is inhabited by pathogenic and non-pathogenic microbes. The leaf's physical and chemical properties, combined with fluctuating and often challenging environmental factors, create surfaces that require a high degree of adaptation for microbial colonization. As a consequence, specific interactive processes have evolved to establish a plant leaf niche. Little is known about the impact of the host immune system on phyllosphere colonization by non-pathogenic microbes. These organisms can trigger plant basal defenses and benefit the host by priming for enhanced resistance to pathogens. In most disease resistance responses, microbial signals are recognized by extra- or intracellular receptors. The interactions tend to be species specific and it is unclear how they shape leaf microbial communities. In natural habitats, microbe-microbe interactions are also important for shaping leaf communities. To protect resources, plant colonizers have developed direct antagonistic or host manipulation strategies to fight competitors. Phyllosphere-colonizing microbes respond to abiotic and biotic fluctuations and are therefore an important resource for adaptive and protective traits. Understanding the complex regulatory host-microbe-microbe networks is needed to transfer current knowledge to biotechnological applications such as plant-protective probiotics.
Collapse
Affiliation(s)
- Vasvi Chaudhry
- Department of Microbial Interactions, IMIT/ZMBP, University of
Tübingen, Tübingen, Germany
| | - Paul Runge
- Department of Microbial Interactions, IMIT/ZMBP, University of
Tübingen, Tübingen, Germany
- Max Planck Institute for Plant Breeding Research, Köln, Germany
| | - Priyamedha Sengupta
- Institute for Plant Sciences and Cluster of Excellence on Plant Sciences
(CEPLAS), University of Cologne, Center for Molecular Biosciences, Cologne,
Germany
| | - Gunther Doehlemann
- Institute for Plant Sciences and Cluster of Excellence on Plant Sciences
(CEPLAS), University of Cologne, Center for Molecular Biosciences, Cologne,
Germany
| | - Jane E Parker
- Max Planck Institute for Plant Breeding Research, Köln, Germany
- Institute for Plant Sciences and Cluster of Excellence on Plant Sciences
(CEPLAS), University of Cologne, Center for Molecular Biosciences, Cologne,
Germany
| | - Eric Kemen
- Department of Microbial Interactions, IMIT/ZMBP, University of
Tübingen, Tübingen, Germany
| |
Collapse
|
33
|
Wang Y, Zhang C, Liang J, Wu L, Gao W, Jiang J. Iturin A Extracted From Bacillus subtilis WL-2 Affects Phytophthora infestans via Cell Structure Disruption, Oxidative Stress, and Energy Supply Dysfunction. Front Microbiol 2020; 11:536083. [PMID: 33013776 PMCID: PMC7509112 DOI: 10.3389/fmicb.2020.536083] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 08/19/2020] [Indexed: 01/07/2023] Open
Abstract
Potato late blight, caused by Phytophthora infestans (Mont.) de Bary, represents a great food security threat worldwide and is difficult to control. Recently, Bacillus spp. have been considered biocontrol agents to control many plant diseases. Here, Bacillus subtilis WL-2 was selected as a potent strain against P. infestans mycelium growth, and its functional metabolite was identified as Iturin A via electrospray ionization mass spectrometry (ESI-MS). Analyses using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that Iturin A caused cell membrane disruption and an irregular internal cell structure. In addition, Iturin A triggered oxidative stress reactions similarly to reactive oxygen species (ROS) in P. infestans cells and caused mitochondrial damage, including mitochondrial membrane potential (MMP), mitochondrial respiratory chain complex activity (MRCCA), and ATP production decline. These results highlight that the cell structure disruption, oxidative stress, and energy supply dysfunction induced by Iturin A play an important role in inhibiting P. infestans. Additionally, B. subtilis WL-2 and Iturin A have great potential for inhibiting P. infestans mycelium growth and controlling potato late blight in the future.
Collapse
Affiliation(s)
- Youyou Wang
- College of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding, China
| | - Congying Zhang
- College of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding, China
| | - Jiao Liang
- College of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding, China
| | - Lufang Wu
- College of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding, China
| | - Wenbin Gao
- College of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding, China
| | - Jizhi Jiang
- College of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding, China
| |
Collapse
|
34
|
Yin L, Liu B, Wang H, Zhang Y, Wang S, Jiang F, Ren Y, Liu H, Liu C, Wan F, Wang H, Qian W, Fan W. The Rhizosphere Microbiome of Mikania micrantha Provides Insight Into Adaptation and Invasion. Front Microbiol 2020; 11:1462. [PMID: 32733410 PMCID: PMC7359623 DOI: 10.3389/fmicb.2020.01462] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 06/04/2020] [Indexed: 11/13/2022] Open
Abstract
Mikania micrantha is a noxious invasive plant causing enormous economic losses and ecological damage. Soil microbiome plays an important role in the invasion process of M. micrantha, while little is known about its rhizosphere microbiome composition and function. In this study, we identified the distinct rhizosphere microbial communities of M. micrantha, by comparing them with those of two coexisting native plants (Polygonum chinense and Paederia scandens) and the bulk soils, using metagenomics data from field sampling and pot experiment. As a result, the enrichment of phosphorus-solubilizing bacteria Pseudomonas and Enterobacter was consistent with the increased soil available phosphorus in M. micrantha rhizosphere. Furthermore, the pathogens of Fusarium oxysporum and Ralstonia solanacearum and pathogenic genes of type III secretion system (T3SS) were observed to be less abundant in M. micrantha rhizosphere, which might be attributed to the enrichment of biocontrol bacteria Catenulispora, Pseudomonas, and Candidatus Entotheonella and polyketide synthase (PKS) genes involved in synthesizing antibiotics and polyketides to inhibit pathogens. These findings collectively suggested that the enrichment of microbes involved in nutrient acquisition and pathogen suppression in the rhizosphere of M. micrantha largely enhances its adaptation and invasion to various environments.
Collapse
Affiliation(s)
- Lijuan Yin
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China.,Key Laboratory of Protein Function and Regulation in Agricultural Organisms of Guangdong Province, College of Life Science, South China Agricultural University, Guangzhou, China
| | - Bo Liu
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Hengchao Wang
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Yan Zhang
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Sen Wang
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Fan Jiang
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Yuwei Ren
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Hangwei Liu
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Conghui Liu
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Fanghao Wan
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Haihong Wang
- Key Laboratory of Protein Function and Regulation in Agricultural Organisms of Guangdong Province, College of Life Science, South China Agricultural University, Guangzhou, China
| | - Wanqiang Qian
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Wei Fan
- Guangdong Laboratory for Lingnan Modern Agriculture (Shenzhen Branch), Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| |
Collapse
|
35
|
Singh S, Singh UB, Malviya D, Paul S, Sahu PK, Trivedi M, Paul D, Saxena AK. Seed Biopriming with Microbial Inoculant Triggers Local and Systemic Defense Responses against Rhizoctonia solani Causing Banded Leaf and Sheath Blight in Maize ( Zea mays L.). INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:E1396. [PMID: 32098185 PMCID: PMC7068308 DOI: 10.3390/ijerph17041396] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 02/14/2020] [Accepted: 02/19/2020] [Indexed: 11/17/2022]
Abstract
Plant growth promoting rhizobacteria Pseudomonas aeruginosa strain MF-30 isolated from maize rhizosphere was characterized for several plant growth stimulating attributes. The strain MF-30 was also evaluated for antifungal properties against Rhizoctonia solani causing banded leaf and sheath blight in maize (Zea mays L.) under in vitro conditions and was found to have higher mycelial growth suppression in the culture suspension (67.41%) followed by volatile organic compounds (62.66%) and crude extract (51.20%) in a dual plate assay. The endophytic and epiphytic colonization ability was tested using Green Fluorescent Protein (GFP)-tagging. Visualization through confocal scanning laser microscope clearly indicated that strain MF-30 colonizes the root and foliar parts of the plants. Further, the effects of seed bio-priming with P. aeruginosa MF-30 was evaluated in the induction and bioaccumulation of defense-related biomolecules, enzymes, natural antioxidants, and other changes in maize under pot trial. This not only provided protection from R. solani but also ensured growth promotion under pathogenic stress conditions in maize. The maximum concentration of hydrogen peroxide (H2O2) was reported in the root and shoot of the plants treated with R. solani alone (8.47 and 17.50 mmol mg-1 protein, respectively) compared to bioagent, P. aeruginosa MF-30 bio-primed plants (3.49 and 7.50 mmol mg-1 protein, respectively). Effects on total soluble sugar content, total protein, and total proline were also found to enhanced significantly due to inoculation of P. aeruginosa MF-30. The activities of anti-oxidative defense enzymes phenylalanine ammonia lyase (PAL), ascorbate peroxidase, peroxidase, superoxide dismutase, and catalase increased significantly in the plants bio-primed with P. aeruginosa MF-30 and subsequent foliar spray of culture suspension of MF-30 compared to pathogen alone inoculated plants. qRT-PCR analysis revealed that seed bio-priming and foliar application of P. aeruginosa MF-30 significantly increased the expression of PR-1 and PR-10 genes with the simultaneous decrease in the disease severity and lesion length in the maize plants under pathogenic stress conditions. A significant enhancement of shoot and root biomass was recorded in MF-30 bio-primed plants as compared to untreated control (p < 0.05). Significant increase in plant growth and antioxidant content, as well as decreased disease severity in the P. aeruginosa MF-30 bio-primed plants, suggested the possibility of an eco-friendly and economical means of achieving antioxidants-rich, healthier maize plants.
Collapse
Affiliation(s)
- Shailendra Singh
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India; (S.S.); (U.B.S.); (D.M.); (S.P.); (P.K.S.); (A.K.S.)
- Amity Institute of Biotechnology, Amity University Uttar Pradesh, Lucknow 227105, India
| | - Udai B. Singh
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India; (S.S.); (U.B.S.); (D.M.); (S.P.); (P.K.S.); (A.K.S.)
| | - Deepti Malviya
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India; (S.S.); (U.B.S.); (D.M.); (S.P.); (P.K.S.); (A.K.S.)
| | - Surinder Paul
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India; (S.S.); (U.B.S.); (D.M.); (S.P.); (P.K.S.); (A.K.S.)
| | - Pramod Kumar Sahu
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India; (S.S.); (U.B.S.); (D.M.); (S.P.); (P.K.S.); (A.K.S.)
| | - Mala Trivedi
- Amity Institute of Biotechnology, Amity University Uttar Pradesh, Lucknow 227105, India
| | - Diby Paul
- Pilgram Marpeck School of Science, Technology, Engineering and Mathematics, Truett McConnel University, 100 Alumni Dr., Cleveland, GA 30528, USA;
| | - Anil Kumar Saxena
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India; (S.S.); (U.B.S.); (D.M.); (S.P.); (P.K.S.); (A.K.S.)
| |
Collapse
|