Indole-3-acetic acid in microbial and microorganism-plant signaling

Diverse bacterial species possess the ability to produce the auxin phytohormone indole-3-acetic acid (IAA). Different biosynthesis pathways have been identified and redundancy for IAA biosynthesis is widespread among plant-associated bacteria. Interactions between IAA-producing bacteria and plants l...

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Bibliographic Details
Published in:FEMS microbiology reviews 2007-07, Vol.31 (4), p.425-448
Main Authors: Spaepen, Stijn, Vanderleyden, Jos, Remans, Roseline
Format: Article
Language:English
Subjects:
Acetic acid
Bacteria
Bacteria - genetics
Bacteria - growth & development
Bacteria - metabolism
Bacteria - pathogenicity
Bacterial physiology
Bacterial Proteins - genetics
Bacterial Proteins - metabolism
Bacteriology
Biological and medical sciences
Biosynthesis
Colonization
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation, Bacterial
indole acetic acid
Indoleacetic acid
Indoleacetic Acids - metabolism
indole‐3‐acetic acid
microbial signaling
Microbiology
Microorganisms
Miscellaneous
Pathogenesis
Plant Development
Plant Diseases - microbiology
Plant Growth Regulators - metabolism
Plant hormones
plant-microorganism interactions
Plants - metabolism
Plants - microbiology
Redundancy
Signal Transduction
Signaling
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Summary:Diverse bacterial species possess the ability to produce the auxin phytohormone indole-3-acetic acid (IAA). Different biosynthesis pathways have been identified and redundancy for IAA biosynthesis is widespread among plant-associated bacteria. Interactions between IAA-producing bacteria and plants lead to diverse outcomes on the plant side, varying from pathogenesis to phytostimulation. Reviewing the role of bacterial IAA in different microorganism-plant interactions highlights the fact that bacteria use this phytohormone to interact with plants as part of their colonization strategy, including phytostimulation and circumvention of basal plant defense mechanisms. Moreover, several recent reports indicate that IAA can also be a signaling molecule in bacteria and therefore can have a direct effect on bacterial physiology. This review discusses past and recent data, and emerging views on IAA, a well-known phytohormone, as a microbial metabolic and signaling molecule.
ISSN:0168-6445
1574-6976
1574-6976
DOI:10.1111/j.1574-6976.2007.00072.x