Analysis of the role of defense mechanisms in the legume-rhizobia symbioisis.

豆科植物与根瘤菌之间的固氮共生是由寄主植物对根瘤菌结节因子的识别启动的。NFS是甲壳素低聚糖的不同修饰衍生物，甲壳素低聚糖是一种真菌激发子，在植物中诱导防御反应。最近的证据表明，NFS和甲壳素激发子都被结构上相关的LysM受体激动子识别。在这里，我们证明了核因子受体是由甲壳素受体进化而来的，变化有限。

Nitrogen-fixing symbiosis between legumes and rhizobia is initiated by the recognition of rhizobial Nod factors (NFs) by host plants. NFs are diversely modified derivatives of chitin oligosaccharide, a fungal elicitor that induces defense responses in plants. Recent evidence has shown that both NFs and chitin elicitors are recognized by structurally-related LysM-receptor kinases. Here, we demonstrated that NF receptors are evolved from the chitin receptors with limited alterations.