phoD-harboring bacterial community composition dominates organic P mineralization under long-term P fertilization in acid purple soil

作者：Ming Lang, Hao-Ming Li, Prakash Lakshmanan, Yuanxue Chen, Xinping Chen · 发表于：Frontiers in Microbiology · 年份：2022 · DOI：10.3389/fmicb.2022.1045919 · 被引用次数：27 · 研究领域：Soil Carbon and Nitrogen Dynamics、Plant nutrient uptake and metabolism、Soil and Water Nutrient Dynamics

Introduction A better understanding of the regulatory role of microorganisms on soil phosphorous (P) mobilization is critical for developing sustainable fertilization practices and reducing P resource scarcity. The phoD genes regulate soil organic P (Po) mobilization. Methods Based on the long-term P application experiments in acid purple soil of maize system in Southwest China (started in 2010), the experiment included five P levels: 0, 16, 33, 49, and 65.5 kg P hm –2 (P0, P16, P33, P49, and P65.5, respectively). The molecular speciation of organic P in soil was determined by 31P-nuclear magnetic resonance (NMR), high-throughput sequencing technology, and real-time qPCR were used to analyze the bacterial community and abundance of phoD -harboring bacterial genes, exploring the bacterial community and abundance characteristics of phoD gene and its relationship with the forms of Po and alkaline phosphatase (ALP) activity in the soil. Results The results showed that the orthophosphate monoesters (OM) were the main Po speciation and varied by P fertilization in acid purple soil. ALP activity decreased as P fertilization increased. Co-occurrence network analysis identified the overall network under five P fertilizations. The keystone taxon base on the network showed that Collimonas , Roseateles , Mesorhizobium , and Cellulomonas positively correlated with both OM and Po. The random forest showed that Cellulomonas , Roseateles , and Rhodoplanes were the key predictors for ALP acti...