Root colonization is a first step during the development of symbiosis between rhizobium and legume plant. It was reported that rhizobium colonization on roots was determined by its ability of chemotaxis and mobility. The relationship between indigenous plasmid and root colonization was reported by using luxAB gene marked strains and modified Leonard jar apparatus. The root colonization dynamics of Sinorhizobium fredii HN01, HN01L marked with luxAB and HND29SR (pSym cured HN01) in rhizosphere of...