Biological characteristics of a manganese resistant microorgnism

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°C to 40°C; 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.