1·Rhizobia establish a symbiotic relationship with their host plant ― exchanging nitrogen for nutrients ― by forming nodules, which penetrate the roots and sometimes stems of the plant.
根瘤菌通过形成根瘤和它们的宿主建立了一种共生关系——用氮换取营养。 根瘤通常会渗透进植物的根，有时候还会渗透进植物的茎。
2·The observation under microscope showed that the rhizobia were present in percycle cells of vascular system of the tobacco hairy roots and in cortex cells and intercellular spaces of rice roots.
显微镜观察表明在烟草发根的维管束中柱鞘细胞、水稻根皮层细胞内和细胞间隙有根瘤菌存在。
3·All the things showed that the rhizobia could induce the root hairs on the lateral roots of some legume species.
说明根瘤菌对有些结瘤豆科树种的根毛具有诱导作用。
4·Legume rhizospheres stimulate more growth of rhizobia than do the rhizospheres of non legumes or soil apart from the roots.
豆科植物的根际比非豆科植物的根际或离根土壤更能刺激根瘤菌的生长。
5·Belonging to the legume family, it enters a complex symbiosis with soil bacteria called rhizobia, which results in the formation of a new root organ, the nodule.
作为豆科植物的一员，大豆与一种被称之为根瘤菌的土壤细菌形成了复杂的共生关系，结果导致新的根器官——根瘤的形成。