高效溶磷菌株PG-9筛选与分析

9株内生细菌的溶磷能力见表2。9株细菌呈现出不同的溶磷能力，速效磷浓度介于111.50-527.15 mg·L-1之间，9株内生细菌溶磷圈直径、溶磷圈与菌落的直径比值（D/d）分别处于1.76-2.08cm、1.85-2.31之间，其中PG-9菌株溶磷圈直径比值最大，为2.31；溶磷能力最高，速效磷浓度达到527.15 mg·L-1，与其它菌株差异显著（P<0.05）。因此，筛选出PG-9菌株作为进一步试验的菌株。

Phosphate solubilization ability analysis of bacterial strains

The phosphate solubilization abilities of 9 endophytic bacteria are shown in Table 2. These 9 strains exhibit different levels of phosphate solubilization, with readily available phosphate concentrations ranging from 111.50 to 527.15 mg·L-1. The diameter ratios (D/d) of the phosphate solubilization zones to the bacterial colonies range from 1.76 to 2.08 cm and 1.85 to 2.31, respectively. Among them, strain PG-9 has the largest diameter ratio of the phosphate solubilization zone, reaching 2.31, and the highest phosphate solubilization ability, with a readily available phosphate concentration of 527.15 mg·L-1. This strain differs significantly from the other strains (P<0.05). Therefore, strain PG-9 was selected for further experiments.