Screening and growth-promoting characteristics of phosphorus-solubilizing strains from the rhizosphere of Phragmites australis in saline-alkali soil
In order to further explore the resources of phosphorus-solubilizing bacteria and develop growth-promoting agents suitable for crops in saline-alkali land,phosphorus-solubilizing bacteria were screened from rhizosphere soil of dryland Phragmites australis in Xinjiang Kizilsu Kirgiz Autonomous saline-alkali soil.Strain identification was carried out by combining restriction fragment length polymorphism and 16S rDNA sequencing,and the strains with outstanding phosphor-us-solubilizing ability were selected for plant inoculation test.As a result,a total of 47 strains of phosphate-solubilizing bac-teria were screened.Among them,32 strains could dissolve inorganic phosphorus with a phosphorus solubility of 55.8-722.3 mg/L.And37 strains could dissolve organic phosphorus with a phosphorus solubility of 11.8-34.4 mg/L.The 47 phosphate-solubilizing bacteria belonged to seven genera,and Enterobacter was dominant.The phosphate-solubilizing strains could effectively promote the growth and root development of Arabidopsis thaliana,especially Bacillus sp.PN-2 and Paeniba-cillus sp.PM-1.The above-ground part(plant height,stem diameter,fresh weight and dry weight of above-ground part)and underground part(fresh weight and dry weight of root)of wheat in salin-alkali soil were also positively af-fected by the phosphate-solubilizing strain,Enterobacter sp.PM-9 and Enterobacter sp.PM-2 were the most promi-nent.The phosphate-solubilizing strains screened in this study have certain application potential and are of great significance for the development of microbial fertilizers suitable for saline-alkali soil.
万方数据
维普
