Article (Scientific journals)
Insights into the molecular basis of biocontrol of Brassica pathogens by Bacillus amyloliquefaciens UCMB5113 lipopeptides
Asari, S.; Ongena, Marc; Debois, Delphine et al.
2017In Annals of Botany, 120 (4), p. 551-562
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Keywords :
Antagonism; Arabidopsis thaliana; Bacillus amyloliquefaciens; Alternaria brassicicola; Arabidopsis; Brassica; Brassica napus; Rhizobium; Alternaria; Antifungal Agents; Disease Resistance; Host-Pathogen Interactions; Lipopeptides; Plant Leaves; Plant Roots
Abstract :
[en] Background and Aims Certain micro-organisms can improve plant protection against pathogens. The protective effect may be direct, e.g. due to antibiotic compounds, or indirect, by priming of plant defence as induced systemic resistance (ISR). The plant growth-promoting rhizobacterium Bacillus amyloliquefaciens UCMB5113 shows potential for disease management of oilseed rape. To investigate the mode of action of this protection, especially in relation to jasmonic acid-dependent ISR, Bacillus UCMB5113 was tested with Arabidopsis thaliana mutants and several important fungal pathogens of Brassica species. Methods Secreted lipopeptide fractions from Bacillus UCMB5113, together with synthetic peptide mimics, were evaluated for their effects on fungal phytopathogens and A. thaliana. The structures of secreted lipopeptides were analysed using mass spectrometry. Plant mutants and reporter lines were used to identify signalling steps involved in disease suppression by lipopeptides. Key Results In plate tests Bacillus UCMB5113 and lipopeptide extracts suppressed growth of several fungal pathogens infecting Brassica plants. Separation of secreted lipopeptides using reversed-phase high-performance liquid chromatography revealed several fractions that inhibited fungal growth. Analysis by mass spectrometry identified the most potent compounds as novel linear forms of antifungal fengycins, with synthetic peptide mimics confirming the biological activity. Application of the lipopeptide extracts on Arabidopsis roots provided systemic protection against Alternaria brassicicola on leaves. Arabidopsis signalling mutants and PDF1.2 and VSP2 promoter-driven GUS lines indicated that the lipopeptide fraction involved jasmonic-acid-dependent host responses for suppression of fungal growth indicative of ISR. Conclusions The ability of Bacillus UCMB5113 to counteract pathogens using both antagonistic lipopeptides and through ISR provides a promising tool for sustainable crop production. © The Author 2017.
Disciplines :
Microbiology
Author, co-author :
Asari, S.;  Department of Plant Biology, Uppsala Biocenter, Linndan Center for Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden
Ongena, Marc ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Microbial, food and biobased technologies
Debois, Delphine ;  Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de spectrométrie de masse (L.S.M.)
De Pauw, Edwin  ;  Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de spectrométrie de masse (L.S.M.)
Chen, K.;  Department of Plant Biology, Uppsala Biocenter, Linndan Center for Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
Bejai, S.;  Department of Plant Biology, Uppsala Biocenter, Linndan Center for Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden
Meijer, J.;  Department of Plant Biology, Uppsala Biocenter, Linndan Center for Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden
Language :
English
Title :
Insights into the molecular basis of biocontrol of Brassica pathogens by Bacillus amyloliquefaciens UCMB5113 lipopeptides
Publication date :
2017
Journal title :
Annals of Botany
ISSN :
0305-7364
eISSN :
1095-8290
Publisher :
Oxford University Press
Volume :
120
Issue :
4
Pages :
551-562
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 05 February 2018

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