Optimum of Solid Fermentation Parameters for Streptomyces sp. S506
根际益生菌链霉菌S506固体发酵条件优化

Streptomyces sp. S506 is one of PGPR strains isolated from tomato rhizosphere. The optimum solid fermentation parameters were studied. According to the amount of alive cells and the rate of conidium production, the optimum parameters were obtained as follows: bran 100 g, mineral matter M-1 15 g, K2HPO4 0.3 g, NaCl 0.25 g, KNO3 0.1 g, CaCO3 0.8 g, natural pH, liquid seed age 84 h, inoculum volume 10%, fermentation temperature 30°C, the ratio of material to water is 10:6, fermentation time 60 h. Under the optimized conditions, the alive cells amount of S506 will reach to 8.27×109 CFU/g, and the number of conidium is 6.23×109 CFU/g.