| Phosphorus dissolvable bacteria can significantly increase the soluble phosphorus content in soil, promote crop growth and increase fertility. In this study, phosphorus dissolvable bacteria were screened from the hemp rhizosphere soil, and a high efficiency phosphorus dissolvable bacterium was screened and identified by methods such as phosphorus soluble amount, germination rate, and germination potential, indole acetic acid (IAA) secretion and the effect of flax growth were measured. The results showed that the screened JX1 strain was identified as Klebsiella sp., with strong phosphorus dissolubility and functional diversity. The maximum phosphorus dissolvable amount was 181.70 mg/L, which could significantly improve the germination potential of flax seeds and the total root length of flax seedlings, having the ability to secrete IAA, the maximum IAA secretion at 49.94 mg/L, 45 days after irrigation of JX1 strain, it could significantly increase the flax plant height, underground dry and fresh weight, total root length, root surface area, root volume and the proportion of fine roots with diameter <0.5 mm, significantly reduce the average root diameter, which had a better effect on promoting the growth of the underground part of flax. This study showed that strain JX1 (Klebsiella sp.) has better ability to dissolve phosphorus and secrete IAA, which can effectively promote the growth of flax roots, optimize the morphology and composition of roots, and improve the absorption and utilization of water and nutrients by flax roots. Provide high efficiency strain resources for the research and development of microbial fertilizers for flax. |
