Schultze M, Kondorosi A
Institut des Sciences Végétales, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France.
Annu Rev Genet. 1998;32:33-57. doi: 10.1146/annurev.genet.32.1.33.
Symbiosis between rhizobia and leguminous plants leads to the formation of N2-fixing root nodules. The interaction of rhizobia and plants shows a high degree of host specificity based on the exchange of chemical signals between the symbiotic partners. The plant signals, flavonoids exuded by the roots, activate the expression of nodulation genes, resulting in the production of the rhizobial lipochitooligosaccharide signals (Nod factors). Nod factors act as morphogens that, under conditions of nitrogen limitation, induce cells within the root cortex to divide and to develop into nodule primordia. This review focuses on how the production of Nod factors is regulated, how these signals are perceived and transduced by the plant root, and the physiological conditions and plant factors that control the early events leading to root nodule development.
根瘤菌与豆科植物之间的共生关系导致了固氮根瘤的形成。根瘤菌与植物之间的相互作用基于共生伙伴之间化学信号的交换，表现出高度的宿主特异性。植物信号，即根系分泌的类黄酮，激活结瘤基因的表达，从而产生根瘤菌脂壳寡糖信号（结瘤因子）。结瘤因子作为形态发生素，在氮限制条件下，诱导根皮层内的细胞分裂并发育成根瘤原基。本综述重点关注结瘤因子的产生是如何被调控的，这些信号是如何被植物根系感知和转导的，以及控制导致根瘤发育早期事件的生理条件和植物因子。
