Factors affecting colonization of introduced microorganisms on plant roots Growth promoting and root colonization ability of Serratia plymuthica A21-4 and its effect on induced resistance in pepper against Phytophthora blight Root Colonization of Sinorhizobium fredii pSym-Cured Strain HN01 in Rhizosphere of Glycine max The growth characteristics and symbiotic effectiveness of six arbuscular mycorrhizal fungi on three soils associated with maize Root colonization and nodulation of Sinorhizobium fredii HN01DL in Glycine max rhizosphere ECOLOGY STUDIES BY Pesudomonas putido P861(Gus) ON ROOT COLONIZATION OF RAPESEED