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Type: Capítulo de livro
Title: The Roles Of Auxin During Plant-microbe Interactions
Author: Alvarez J.C.
Moraes M.H.
Garcia O.
Pereira G.A.G.
Mondego J.M.C.
Abstract: Among all the phytohormones, auxin likely plays the most roles in plant physiology. With an intricate biosynthesis pathway and a complex gene signaling cascade, auxin is involved in many biological processes, including plant growth and responses against potential pathogens. It has been extensively documented that some microorganisms are capable of synthesizing this phytohormone, especially indole-3-acetic acid (IAA), the major naturally occurring auxin. In an environmental scenario consisting of bacteria and fungi interacting with plants, the production of auxin by such microorganisms may lead to hormonal imbalances in the host. This disturbance in plant hormonal status can modulate plant metabolism and defense systems, favoring symbiosis or pathogenesis. The basic mechanism of IAA as a modulator of plant gene expression is well understood, and new evidence about the mechanisms by which microbes affect plant auxin activities is now emerging. This review focuses on the effects of auxins produced by microorganisms during plant-microbe interactions. The routes of auxin biosynthesis in bacteria and fungi are described for some organisms. We also give examples of the effects of microbe-produced auxin in symbiotic and pathogenic events and describe how plants modulate IAA signaling to counteract infection by biotrophic pathogens. © 2012 Nova Science Publishers, Inc. All rights reserved.
Editor: Nova Science Publishers, Inc.
Rights: aberto
Identifier DOI: 
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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