根瘤菌与群体感应

Quorum sensing in nitrogen-fixation rhizobia.

细菌在高细胞密度下可以产生群体感应信号分子,调控细菌相关基因的表达,这种信号分子被称为自体诱导物。酰基高丝氨酸内酯类化合物(acyl HSLs)是在根瘤菌中广泛存在的一类自体诱导物,该群体感应系统与根瘤菌和植物的共生作用密切相关。本文概述了AHLs介导的群体感应系统的组成及调控机制和不同根瘤菌中群体感应调节对根瘤菌生理行为及共生固氮的影响。

Bacteria can regulate gene expression by producing signal molecules termed autoinducers at high cell density.In general,Gram-negative nitrogen-fixation rhizobia use acylated homoserine lactones (acy1-HSLs) as autoinducers.Quorum sensing plays important roles in coordinating the symbiotic process during the interactions between rhizobia and their legume hosts.This review summarized the composition and regulation mechanisms of AHLs-mediated quorum sensing,physiological activity changes and symbiotic nitrogen-fixing effects caused by quorum sensing in rhizobia.