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Pseudomonas putida Represses JA- and SA-Mediated Defense Pathways in Rice and Promotes an Alternative Defense Mechanism Possibly through ABA Signaling.


ABSTRACT: The signaling pathways induced by Pseudomonas putida in rice plants at the early plant-rhizobacteria interaction stages, with and without inoculation of Xanthomonas oryzae pv. oryzae, were studied. In the absence of pathogen, P. putida reduced ethylene (ET) production, and promoted root and stem elongation. Interestingly, gene OsHDA702, which plays an important role in root formation, was found significantly up-regulated in the presence of the rhizobacterium. Although X. oryzae pv. oryzae inoculation enhanced ET production in rice plants, P. putida treatment repressed ET-, jasmonic acid (JA)- and salicylic acid (SA)-mediated defense pathways, and induced the biosynthesis of abscisic acid (ABA), and the overexpression of OsHDA705 and some pathogenesis-related proteins (PRs), which in turn increased the susceptibility of the rice plants against the pathogen. Collectively, this is the first work on the defense signaling induced by plant growth-promoting rhizobacteria in plants at the early interaction stages, and suggests that rhizobacteria stimulate an alternative defense mechanism in plants based on ABA accumulation and OsHDA705 signaling.

SUBMITTER: Wang R 

PROVIDER: S-EPMC7760693 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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<i>Pseudomonas putida</i> Represses JA- and SA-Mediated Defense Pathways in Rice and Promotes an Alternative Defense Mechanism Possibly through ABA Signaling.

Wang Rui R   Wang Hai-Lin HL   Tang Rui-Ping RP   Sun Meng-Ying MY   Chen Tang-Min TM   Duan Xu-Chu XC   Lu Xiao-Feng XF   Liu Dong D   Shi Xin-Chi XC   Laborda Pedro P   Wang Su-Yan SY  

Plants (Basel, Switzerland) 20201124 12


The signaling pathways induced by <i>Pseudomonas putida</i> in rice plants at the early plant-rhizobacteria interaction stages, with and without inoculation of <i>Xanthomonas oryzae</i> pv. <i>oryzae</i>, were studied. In the absence of pathogen, <i>P. putida</i> reduced ethylene (ET) production, and promoted root and stem elongation. Interestingly, gene <i>OsHDA702</i>, which plays an important role in root formation, was found significantly up-regulated in the presence of the rhizobacterium. A  ...[more]

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