Isolation and screening of inorganic phosphate-solubilizing bacteria and their effect on the growth of Bromus cartharticus

doi:10.11686/cyxb2016215

Abstract

Abstract: We screened rhizosphere microorganisms of bromegrass (Bromus cartharticus) and isolated bacteria with phosphate-solubilization activity. The isolated bacteria were further analyzed to quantify their phosphorus-solubilization activity, indole acetic acid (IAA) secretion capacity, and their ability to promote the growth of bromegrass. The isolated microorganisms showed differences in their ability to utilize different inorganic phosphate substrates. All the selected strains had phosphate solubilization activity with calcium phosphate as the phosphorus source, whereas only strains Br1, Br7 and Br8 were able to solubilize phosphate with aluminum phosphate as the phosphorus source. Strain Br7 had the strongest phosphate-solubilization ability. Strains Br4, Br8, Br17, and Br24 secreted relatively large amounts of IAA, and IAA secretion was enhanced when exogenous tryptophan (an IAA precursor) was added. Analyses of the medium pH indicated that all eight isolated strains were acid-producing bacteria. The root length, root number, plant height, and total biomass of bromegrass inoculated with these isolated strains were measured. Strains Br8, Br13, Br17, and Br24 strongly affected root growth, resulting in a shorter main root but more abundant roots. Strains Br7, Br8, Br13, and Br24 increased bromegrass plant height and biomass. These results indicate that strain Br24 has great potential to improve the growth of bromegrass in Guizhou province.

CLC Number:

lixiaodongzl@163.com

SHU Jian-Hong, WANG Pu-Chang, LI Xian-Gang, WANG Xiao-Li, LI Xiao-Dong. Isolation and screening of inorganic phosphate-solubilizing bacteria and their effect on the growth of Bromus cartharticus[J]. Acta Prataculturae Sinica, 2017, 26(5): 173-180.

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