Koul Vatsala, Adholeya Alok, Kochar Mandira
TERI Deakin Nanobiotechnology Centre, Biotechnology and Bioresources Division, The Energy and Resources Institute, Darbari Seth Block, India Habitat Centre, Lodhi Road, New Delhi, India.
J Basic Microbiol. 2015 May;55(5):543-53. doi: 10.1002/jobm.201400224. Epub 2014 Jun 10.
Bacterial biosynthesis of the phytohormone, indole-3-acetic acid (IAA) is well established and along with the diffusible gaseous molecule, nitric oxide (NO) is known to positively regulate the developmental processes of plant roots. IAA and NO act as signaling molecules in plant-microbe interactions as they modulate the gene expression in both, plants and microorganisms. Although IAA and NO may not be required for essential bacterial physiological processes, numerous studies point towards a crosstalk between IAA and NO in the rhizosphere. In this review, we describe various IAA and NO-responsive or sensing genes/proteins/regulators. There is also growing evidence for the interaction of IAA and NO with other plant growth regulators and the involvement of NO with the quorum sensing system in biofilm formation and virulence. This interactive network can greatly impact the host plant-microbe interactions in the soil. Coupled with this, the specialized σ(54) -dependent transcription observed in some of the IAA and NO-influenced genes can confer inducibility to these traits in bacteria and may allow the expression of IAA and NO-influenced microbial genes in nutrient limiting or changing environmental conditions for the benefit of plants.
植物激素吲哚 - 3 - 乙酸（IAA）的细菌生物合成已得到充分证实，并且已知与可扩散的气态分子一氧化氮（NO）一起正向调节植物根系的发育过程。IAA和NO在植物 - 微生物相互作用中作为信号分子，因为它们调节植物和微生物中的基因表达。虽然IAA和NO可能不是细菌基本生理过程所必需的，但大量研究表明根际中IAA和NO之间存在相互作用。在本综述中，我们描述了各种IAA和NO响应或传感基因/蛋白质/调节剂。越来越多的证据表明IAA和NO与其他植物生长调节剂相互作用，以及NO参与生物膜形成和毒力中的群体感应系统。这种交互网络可以极大地影响土壤中宿主植物与微生物的相互作用。与此相关的是，在一些受IAA和NO影响的基因中观察到的特殊的依赖σ(54)的转录可以赋予细菌这些性状诱导性，并可能使受IAA和NO影响的微生物基因在营养限制或变化的环境条件下表达，从而有利于植物。
