Indole-3-acetic Acid-mediated Cross-kingdom Signalling Involved in Plant-bacteria Interactions

doi:10.13560/j.cnki.biotech.bull.1985.2016.08.003

Abstract

Abstract: As the most common and naturally-occurring phytohormone of the auxin class,indole-3-acetic acid（IAA）involves in regulating many aspects of plant growth and development. The studies revealed that in nature,not only plant may synthesize the IAA,but also a variety of microorganisms including both phytopathogens and plant growth-promoting bacteria possess the ability of producing the auxin phytohormone inducing plant diseases or promoting plant growth. Interestingly,apart from being the secondary bacterial metabolite interfering the hormone homeostasis of host plants,IAA can also be a signaling molecule modulating gene expression and physiology in bacteria,consequently regulating the plant-bacteria interaction through integration into the complex regulatory network in bacteria. This review provides insights into the recent research progresses on IAA biosynthesis pathways and its regulations in bacteria,IAA-mediated control of bacterial gene expression,physiology and behavior,as well as the interaction with host plants varying from pathogenesis to phytostimulation. The review also highlights that IAA can not only modulate the plant growth,development and defense,but also act as cross-kingdom signal molecules playing a critical role in the regulation of the plant-microbe interactions. The review aims to develop novel strategies for the improvement of the plant-growth promotion and tolerance to both biotic and abiotic stresses by further studying and better understanding of the IAA-mediated cross-kingdom signalling mechanisms and genetically manipulating the bacterial IAA signal pathways.

Key words: indole-3-acetic acid（IAA）, bacterial IAA biosynthesis, IAA genetic regulation, plant-bacteria interactions

YANG Yang, GAO Ke-xiang, WU Yan, LIU Xiao-guang. Indole-3-acetic Acid-mediated Cross-kingdom Signalling Involved in Plant-bacteria Interactions[J]. Biotechnology Bulletin, 2016, 32(8): 14-21.

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