Stomatal Closure and SA-, JA/ET-Signaling Pathways Are Essential for Bacillus amyloliquefaciens FZB42 to Restrict Leaf Disease Caused by Phytophthora nicotianae in Nicotiana benthamiana

FZB42 is a plant growth-promoting rhizobacterium that induces resistance to a broad spectrum of pathogens. This study analyzed the mechanism by which FZB42 restricts leaf disease caused by in . The oomycete foliar pathogen is able to reopen stomata which had been closed by the plant innate immune re...

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Published in:Frontiers in microbiology 2018-04, Vol.9, p.847-847
Main Authors: Wu, Liming, Huang, Ziyang, Li, Xi, Ma, Liumin, Gu, Qin, Wu, Huijun, Liu, Jia, Borriss, Rainer, Wu, Zhen, Gao, Xuewen
Format: Article
Language:English
Subjects:
ABA
Bacillus amyloliquefaciens FZB42
ISR
Microbiology
Nicotiana benthamiana
stomata
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Summary:FZB42 is a plant growth-promoting rhizobacterium that induces resistance to a broad spectrum of pathogens. This study analyzed the mechanism by which FZB42 restricts leaf disease caused by in . The oomycete foliar pathogen is able to reopen stomata which had been closed by the plant innate immune response to initiate penetration and infection. Here, we showed that root colonization by FZB42 restricted pathogen-mediated stomatal reopening in . Abscisic acid (ABA) and salicylic acid (SA)-regulated pathways mediated FZB42-induced stomatal closure after pathogen infection. Moreover, the defense-related genes , , and , involved in the SA and jasmonic acid (JA)/ethylene (ET) signaling pathways, respectively, were overexpressed, and levels of the hormones SA, JA, and ET increased in the leaves of FZB42-treated wild type plants. Disruption of one of these three pathways in plants increased susceptibility to the pathogen. These suggest that SA- and JA/ET-dependent signaling pathways were important in plant defenses against the pathogen. Our data thus explain a biocontrol mechanism of soil rhizobacteria in a plant.
ISSN:1664-302X
1664-302X
DOI:10.3389/fmicb.2018.00847