scholarly journals Biocontrol agent Bacillus amyloliquefaciens LJ02 induces systemic resistance against cucurbits powdery mildew

2015 ◽  
Vol 6 ◽  
Author(s):  
Yunlong Li ◽  
Yilin Gu ◽  
Juan Li ◽  
Mingzhu Xu ◽  
Qing Wei ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Bacillus Amyloliquefaciens ◽  
Biocontrol Agent ◽  
Systemic Resistance

Potential of an endophytic bacteria Bacillus amyloliquefaciens 3–5 as biocontrol agent against potato scab

2021 ◽  
pp. 105382
Author(s):  
Lingxiao Cui ◽  
Chengde Yang ◽  
Yinyu Wang ◽  
Ting Ma ◽  
Fengfeng Cai ◽  
...  
Keyword(s):  
Bacillus Amyloliquefaciens ◽  
Endophytic Bacteria ◽  
Biocontrol Agent ◽  
Potato Scab

scholarly journals Exploring Elicitors of the Beneficial Rhizobacterium Bacillus amyloliquefaciens SQR9 to Induce Plant Systemic Resistance and Their Interactions With Plant Signaling Pathways

2018 ◽  
Vol 31 (5) ◽  
pp. 560-567 ◽  
Author(s):  
Gengwei Wu ◽  
Yunpeng Liu ◽  
Yu Xu ◽  
Guishan Zhang ◽  
Qirong Shen ◽  
...  
Keyword(s):  
Signaling Pathways ◽  
Pseudomonas Syringae ◽  
Bacillus Amyloliquefaciens ◽  
Systemic Resistance ◽  
Plant Signaling ◽  
Relative Contribution ◽  
Induced Plant Resistance ◽  
Plant Growth Promoting ◽  
Induction Of Resistance ◽  
Growth Promoting

Beneficial rhizobacteria have been reported to produce various elicitors that induce plant systemic resistance, but there is little knowledge concerning the relative contribution of multiple elicitors from a single beneficial rhizobacterium on the induced systemic resistance in plants and the interactions of these elicitors with plant signaling pathways. In this study, nine mutants of the plant growth–promoting rhizobacterium Bacillus amyloliquefaciens SQR9 deficient in producing the extracellular compounds, including fengycin, bacillomycin D, surfactin, bacillaene, macrolactin, difficidin, bacilysin, 2,3-butandiol, and exopolysaccharides, were tested for the induction of systemic resistance against Pseudomonas syringae pv. tomato DC3000 and Botrytis cinerea and the transcription of the salicylic acid, jasmonic acid, and ethylene signaling pathways in Arabidopsis. Deficiency in producing any of these compounds in SQR9 significantly weakened the induced plant resistance against these phytopathogens. These SQR9-produced elicitors induced different plant defense genes. For instance, the enhancement of 1,3-glucanase (PR2) by SQR9 was impaired by a deficiency of macrolactin but not surfactin. SQR9 mutants deficient in the lipopeptide and polyketide antibiotics remained only 20% functional for the induction of resistance-related gene transcription. Overall, these elicitors of SQR9 could act synergistically to induce plant systemic resistance against different phytopathogens through different signaling pathway genes, and the bacterial antibiotics are major contributors to the induction.

scholarly journals Bacillus amyloliquefaciens MBI600 differentially induces tomato defense signaling pathways depending on plant part and dose of application

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Anastasia Dimopoulou ◽  
Ioannis Theologidis ◽  
Burghard Liebmann ◽  
Kriton Kalantidis ◽  
Nikon Vassilakos ◽  
...  
Keyword(s):  
Plant Defense ◽  
Stress Responses ◽  
Bacillus Amyloliquefaciens ◽  
Plant Pathogens ◽  
Biological Control Agent ◽  
Induced Defense ◽  
Systemic Resistance ◽  
Marker Genes ◽  
Dependent Manner ◽  
Plant Host

AbstractThe success of Bacillus amyloliquefaciens as a biological control agent relies on its ability to outgrow plant pathogens. It is also thought to interact with its plant host by inducing systemic resistance. In this study, the ability of B. amyloliquefaciens MBI600 to elicit defense (or other) responses in tomato seedlings and plants was assessed upon the expression of marker genes and transcriptomic analysis. Spray application of Serifel, a commercial formulation of MBI600, induced responses in a dose-dependent manner. Low dosage primed plant defense by activation of SA-responsive genes. Suggested dosage induced defense by mediating synergistic cross-talk between JA/ET and SA-signaling. Saturation of tomato roots or leaves with MBI600 elicitors activated JA/ET signaling at the expense of SA-mediated responses. The complex signaling network that is implicated in MBI600-tomato seedling interactions was mapped. MBI600 and flg22 (a bacterial flagellin peptide) elicitors induced, in a similar manner, biotic and abiotic stress responses by the coordinated activation of genes involved in JA/ET biosynthesis as well as hormone and redox signaling. This is the first study to suggest the activation of plant defense following the application of a commercial microbial formulation under conditions of greenhouse crop production.

scholarly journals Effectors involved in fungal-fungal interaction lead to a rare phenomenon of hyperbiotrophy in the tritrophic system biocontrol agent-powdery mildew-plant

2017 ◽  
Vol 217 (2) ◽  
pp. 713-725 ◽  
Author(s):  
Joan Laur ◽  
Gowsica Bojarajan Ramakrishnan ◽  
Caroline Labbé ◽  
François Lefebvre ◽  
Pietro D. Spanu ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Biocontrol Agent ◽  
Tritrophic System ◽  
Rare Phenomenon
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