Plant-Microbe Communication Enhances Auxin Biosynthesis by a Root-Associated Bacterium, Bacillus amyloliquefaciens SQR9

Molecular Plant-microbe Interactions : MPMI
Yunpeng LiuRuifu Zhang

Abstract

Mechanisms by which beneficial rhizobacteria promote plant growth include tryptophan-dependent indole-3-acetic acid (IAA) synthesis. The abundance of tryptophan in the rhizosphere, however, may influence the level of benefit provided by IAA-producing rhizobacteria. This study examined the cucumber-Bacillus amyloliquefaciens SQR9 system and found that SQR9, a bacterium previously shown to enhance the growth of cucumber, increased root secretion of tryptophan by three- to fourfold. Using a split-root system, SQR9 colonization of roots in one chamber not only increased tryptophan secretion from the noninoculated roots but also increased the expression of the cucumber tryptophan transport gene but not the anthranilate synthesis gene in those roots. The increased tryptophan in isolated rhizosphere exudates was sufficient to support increased IAA production by SQR9. Moreover, SQR9 colonization of roots in one chamber in the split-root system resulted in sufficient tryptophan production by the other roots to upregulate SQR9 IAA biosynthesis genes, including a 27-fold increase in the indole-3-acetonitrilase gene yhcX during subsequent colonization of those roots. Deletion of yhcX eliminated SQR9-mediated increases in root surface area,...Continue Reading

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Citations

Dec 2, 2017·International Journal of Molecular Sciences·Damilola OlatunjiInge Verstraeten
Jan 10, 2018·Frontiers in Microbiology·Kristin Schulz-BohmPaolina Garbeva
Jan 31, 2020·Scientific Reports·Vanessa N KavamuraTim H Mauchline
Jan 23, 2018·Frontiers in Microbiology·Catherine Z ZhaoDazhong Zhao
Sep 13, 2020·Applied Microbiology and Biotechnology·Chetan KeswaniEstibaliz Sansinenea
Nov 20, 2016·Journal of Experimental Botany·Julien BesnardSakiko Okumoto
Sep 4, 2018·The Science of the Total Environment·Hu LiYong-Guan Zhu
Dec 13, 2018·Journal of Agricultural and Food Chemistry·Cheng ZhouJianfei Wang
Oct 27, 2021·Applied Microbiology and Biotechnology·Jorge Poveda, Fernando González-Andrés

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