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Cold Spring Harb Perspect Biol. 2011 Apr 1;3(4). pii: a001438. doi: 10.1101/cshperspect.a001438.

Auxin and plant-microbe interactions.

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1
Centre of Microbial and Plant Genetics, Department of Microbial and Molecular Systems, Katholieke Universiteit Leuven, Belgium.

Abstract

Microbial synthesis of the phytohormone auxin has been known for a long time. This property is best documented for bacteria that interact with plants because bacterial auxin can cause interference with the many plant developmental processes regulated by auxin. Auxin biosynthesis in bacteria can occur via multiple pathways as has been observed in plants. There is also increasing evidence that indole-3-acetic acid (IAA), the major naturally occurring auxin, is a signaling molecule in microorganisms because IAA affects gene expression in some microorganisms. Therefore, IAA can act as a reciprocal signaling molecule in microbe-plant interactions. Interest in microbial synthesis of auxin is also increasing in yet another recently discovered property of auxin in Arabidopsis. Down-regulation of auxin signaling is part of the plant defense system against phytopathogenic bacteria. Exogenous application of auxin, e.g., produced by the pathogen, enhances susceptibility to the bacterial pathogen.

PMID:
21084388
PMCID:
PMC3062209
DOI:
10.1101/cshperspect.a001438
[Indexed for MEDLINE]
Free PMC Article
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