豆科植物根瘤茵结瘤因子的感知与信号转导

结瘤因子(脂壳寡糖,lipo-chito-oligosaccharides,LCOs)是根瘤菌在宿主植物根系分泌的类黄酮的作用下,合成并分泌的一类多糖信号分子,在根瘤菌与植物的共生结瘤过程中起重要作用。结瘤因子通过一定的机制感知,与某种特定受体(结瘤因子结合蛋白)结合,通过结瘤因子激活的信号转导途径如Ca2 介导的信号转导途径或磷酸类脂信号转导途径,诱导宿主植物的一系列反应,如根毛质膜去极化、皮层细胞分裂和结瘤素基因表达等。同时,结瘤因子的感知与信号转导也受一定基因和反馈机制调控。就豆科植物根瘤菌结瘤因子感知机制、信号转导途径及反馈调控等方面的研究进展进行了全面阐述。

Perception and Signal Transduction of Rhizobium Nod Factor in leguminous plants

Nod factors (lipo-chito-oligosaccharides,LCOs) are signal molecules produced by rhizobium in effects of flavonoids secreted by plant roots, play an important role in the process of symbiosis. Nod factors recognize signals by using a certain mechanism, binding to a putative receptor (Nod factor binding protein), via the signaling ways activated by Nod factors such as calcium mediated signal transduction and phospholipid signaling way, induce a series of plant response, such as depolarization of root hair membrane, dividation of cotex and expression of nodulin genes. Moreover, Nod factor perception and signaling is regulated by some gene and feedback mechanism. A review will be established in this paper to introduce the perception mechanism, signal transduction ways and feedback regulation of rhizobium Nod factor in leguminous plants.