Root colonization and nodulation of Sinorhizobium fredii HN01DL in Glycine max rhizosphere The competitiveness of Bradyrhizobium sp. (Arachis) studied by using luxAB marker gene technique Effect of matric potential on the survival of luxAB marked Rhizobium fredii in soil Root Colonization of Sinorhizobium fredii pSym-Cured Strain HN01 in Rhizosphere of Glycine max