红树林溶磷菌的初步鉴定、溶磷能力测定及其优化培养

Primary Identification, Capability of Phosphate-Solubilization and Optimization of Medium of Some Microorganism from Mangrove

摘要:

对分离来自华南红树林的溶磷菌进行16S rDNA或ITS等基因水平上的初步鉴定, 测定其溶解无机磷的能力, 并对溶磷菌的生长培养基条件进行优化。结果表明, 溶磷真菌的溶磷效果明显强于溶磷细菌, 且溶磷真菌的溶解无机磷能力与培养液的pH呈极显著负相关, 而溶磷细菌的溶磷能力与pH没显著相关关系。单因素实验表明, 对供试菌株生长的合适碳源为麦芽糖, 氮源为尿素。通过正交实验得到的优化培养基为麦芽糖5 g/L、尿素0.05 g/L、NaCl 5 g/L、pH 5, 在30°C下培养48 h菌落总数可达6.06×

Abstract:

The genetic indentification of 16S rDNA or ITS, capability of phosphate-solubilization and pH of medium, and optimization of medium of some microorganism isolated from mangrove were investigated in this study. The result showed that the fungi normally had much higher capacity to dissolve the inorganic phosphate than the bacteria, the capacity of the fungi was closely correlated to the pH of medium, but the relationship was weak for the bacteria. It was illustrated by single factor experiments that the optimal carbon and nitrogen sources were maltose and urea respectively. The orthogonal design was employed in testing the optimum composition of medium composed of 5 g/L maltose, 0.05 g/L urea, 5 g/L NaCl, pH 5. In this optimal medium, the effectively enrichment of bacteria could reach up to 6.06×109 CFU/mL under 30°C for 48 hours cultivation.