Evaluation of in vitro solubilization potential of phosphate solubilising Streptomyces isolated from phyllosphere of Heritiera fomes (mangrove)

摘要

Phosphate solubilising ability of five?Streptomyces?isolated from the phyllosphere ofHeritiera fomes?grown in Bhitarkanika mangrove ecosystem? was evaluated? using tricalcium phosphate (TCP) in both plates and broth culture conditions as well as with and without NaCl.?Streptomyces?ST24 showed highest solubilization of TCP, with 50.8 and 48.0 mm of halo zone in the plate assay done at pH 7.2 and temperatures 30 and 37°C.?Streptomyces?ST21, ST24 and ST26 showed good solubilization of TCP in culture medium with 52.15, 50.77 and 52.07 μg/ml, respectively. The requirement of NaCl for better solubilization of TCP was observed in all?Streptomyces. However, ST23 and ST24 showed solubilization activity without addition of NaCl. Thus the solubilization potential varies among different isolates of?Streptomyces. It also differed according to incubation period. Over all, the best solubilization ability of all testStreptomyces?could be observed in the presence of 0.2% NaCl. The solubilization might be due to production of acids by the culture, since the pH of the culture broth was changed from initial pH of 7.2 and 9.0 to lower pH values.