Screen, Identification and Analysis on the Growth-Promoting Ability for the Rice Growth-Promoting Rhizobacteria
Plant growth- promoting rhizobacteria(PGPR)can secrete the growth hormone and promote soil nutrient cycling, thus, is an important germplasm resource of bio-fertilizer. In this study, the PGPR was isolated from the rice rhizosphere. According to 16S rDNA sequences, 10 strains were identifed, including 4 organic phosphorus bacteria(Bacillus pumilus LZP02, Bacillus aryabhattai LZP08, Staphylococcus epidermidis LZP10, Bacillus ginsengisoli LZP05), 3 inorganic phosphorus bacteria(Bacillus megaterium LZP03, Bacillus oryzaecorticis LZP04,Bacillus ginsengisoli LZP07)and 3 potassium bacteria(Bacillus aryabhattai LZP01,Bacillus subtilis LZP06,Bacillus licheniformis LZP09). The results from nutrient conversion analysis showed that Bacillus aryabhattai LZP01 and Bacillus subtilis LZP06 performed better on the potassium releasing ability. Bacillus pumilus LZP02 and Bacillus huizhouensis LZP05 performed better on the function of organic phosphorus. Bacillus megaterium LZP03 and Bacillus ginsengisoli LZP07 performed better on the function of inorganic phosphorus.Further,the hormone secretion capacity was measured for these 6 strains.The results showed that all 6 strains could produce auxin and gibberellin,and had the ability to synthesize iron carrier.Moreover,the results showed that Bacillus megaterium LZP03,Bacillus huizhouensis LZP05 and Bacillus subtilis LZP06 had stronger ability to promote the nutrient conversion and hormone secretion. Systematically,we believe that these three strains have great potential application on microbial fertilizer.
国家科技期刊平台
NSTL
万方数据
维普
