Zheng Jiaxin, Liu Chao, Liu Jiayi, Zhuang Jia Yao
Collaborative Innovation Center of Sustainable Forestry in Southern China of Jiangsu Province, Nanjing Forestry University, Nanjing, China.
Front Microbiol. 2022 Oct 24;13:988692. doi: 10.3389/fmicb.2022.988692. eCollection 2022.
Soil microorganisms play an indispensable role in plant growth and are widely used to promote plant growth. However, poor microbial strains are homogeneous. The heavy application of chemical fertilizers and pesticides to agricultural soil has adversely affected the soil flora, necessitating the regulation of the soil flora to maintain soil health. In this study, X-45, a highly efficient and phosphorus-dissolving strain of the lysogenic bacterium N1.14 was isolated from bare rock slope soil samples from Yueyang Avenue, Hunan Province, China. We observed that microbial strain X-45 could release P from the rocks into solution when the sample rocks were used as the only phosphorus source. Furthermore, we observed that the P content in media increased by 3.08 X compared to the control. After applying X-45 as a bacterial fertilizer, the growth of potted plants significantly increased, the soil physicochemical properties were significantly improved, and the relative abundance of in the soil increased significantly from 1 to 42%. Besides, became the most dominant genus in the soil. The indirect promotion of another beneficial microorganism by X-45 further revealed the intrinsic mechanism by which X-45 exerted its effect on plant promotion and soil improvement. Using this bacteria, the hypothesis of the superposition effect of legume plant promotion was also confirmed.
土壤微生物在植物生长中发挥着不可或缺的作用，并且被广泛用于促进植物生长。然而，劣质微生物菌株具有同质性。在农业土壤中大量施用化肥和农药对土壤菌群产生了不利影响，因此需要对土壤菌群进行调控以维持土壤健康。在本研究中，从中国湖南省岳阳大道的裸岩边坡土壤样本中分离出了溶源菌N1.14的高效解磷菌株X-45。我们观察到，当样本岩石作为唯一磷源时，微生物菌株X-45能够将岩石中的磷释放到溶液中。此外，我们观察到培养基中的磷含量相比对照组增加了3.08倍。施用X-45作为菌肥后，盆栽植物的生长显著增加，土壤理化性质得到显著改善，土壤中某菌属的相对丰度从1%显著增加到42%。此外，该菌属成为土壤中最主要的菌属。X-45对另一种有益微生物的间接促进作用进一步揭示了X-45对植物促生和土壤改良发挥作用的内在机制。利用这种细菌，豆科植物促生叠加效应的假设也得到了证实。
