Ecological adaptation of heavy metal polluted environments is significantly enhanced through plants inoculated with plant growth-promoting bacteria (PGPB), and the cost of phytostabilization in metal tailings can be reduced. On the basis of the systematic investigation of manganese tolerant plants which grew on Xiangtan manganese tailings, rhizosphere soils of the Chenopodium album Linn. were collected. One yellow manganese-resistant strain named XZL01 was isolated from the rhizosphere of fresh plants through concentration gradient screening technique, and the cellular form, physiological and biochemical tests were conducted, demonstrated as the growth curve and effects of temperature, pH, NaCl concentration on growth of the strain. All the results showed that 1) the strain reached logarithmic phase in 10-12h; 2) the optimal temperature range for growth of the strain was 25 ºC-30 ºC; 3) the optimal pH range for growth of the strain was 7.0-7.3; 4) the optimal NaCl concentration range for growth of the strain was 10g/L. In this study, the strain XZL01 was identified, and status of the strain in the taxonomy and phylogeny has been conformed according to 16S rDNA sequences, with the strain identificated as Microbacterium.sp XZL01.

Rhizosphere soils of Chenopodium album Linn were collected by means of filed surveys on Xiangtan manganese tailings. One red manganese-resistant strain numbered XY was isolated from the rhizosphere of exarid plant through concentration gradient screening technique. The cellular form, physiological and biochemical tests were conducted using the growth curve, and effects of temperature, pH, NaCl concentration to growth of the strain tested were investigated. The results of the tests showed that 1) the strain reached logarithmic phase in 5-26h; 2) the optimal temperature range for growth of the strain was from 35 to 40 ; 3) the optimal pH range for growth of the strain was from 7.0 to 7.3; 4) the optimal NaCl concentration range for growth of the strain was 10g/L. In this study, the strain XY was identified, and status of the strain in the taxonomy and phylogeny has been conformed according to 16S rDNA sequences, demonstrating that the strain XY belongs to Serratia genus.