Screening and Preliminary Identification of Dominant Plant Growth-Promot-ing Rhizobacterial Species in Alpine Desertification
To select and obtain superior plant growth-promoting rhizobacteria(PGPR)from dominant plants in alpine sandy areas and to enrich the strain resource library for such environments,this study isolated and screened 112 PGPR strains from the rhizosphere of 10 dominant plant species widely distributed in the sandy areas of Zoige Plateau.Among these,30 strains were inorganic phosphorus-solubilizing bacteria,with phospho-rus solubilization levels ranging from 73.47 to 685.45 μg·mL-¹;30 strains were organic phosphorus-solubiliz-ing bacteria,with phosphorus solubilization levels ranging from 41.92 to 94.33 μg·mL⁻¹;22 strains were nitro-gen-fixing bacteria,with nitrogenase activity ranging from 0.01 to 10.10 nmol·h⁻¹·mL⁻¹;and 30 strains were capable of secreting indole-3-acetic acid(IAA),with secretion levels ranging from 9.78 to 48.97 μg·mL⁻¹.Twelve strains with excellent overall abilities were identified,including 6 strains of Pseudomonas,3 strains of Serratia,2 strains of Variovorax,and 1 strain of Bacillus.These strains provide high-quality microbial resources for constructing a microbial resource library suitable for alpine regions and for preparing region-spe-cific microbial fertilizers.
万方数据
维普
