Rare taxa of alkaline phosphomonoesterase-harboring microorganisms mediate soil phosphorus mineralization

By Xiaomeng Wei, Yajun Hu, B. Razavi, Juan Zhou, Jianlin Shen, P. Nannipieri, Jinshui Wu, T. Ge. Soil Biology and Biochemistry, 2019

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Abstract As a homologous gene encoding microbial alkaline phosphomonoesterase, the expression of phoD is critically controlled by P availability and thus contributes to the mineralization of soil organic P under P-depleted condition. However, its role in the regulation of soil P turnover is largely unknown due to the complex coupling of physiochemical and biological processes in the P cycle, especially in paddy field. We hypothesized that 1) P fertilization would decrease the abundance of phoD gene and change the composition of phoD-harboring microbial community and 2) the high abundance of phoD-harboring microorganisms in P-poor soil would stimulate the synthesis of alkaline phosphomonoesterase, thus mitigating P limitation via the mineralization of organic P. After 42 days of rice growth, the phoD abundance negatively correlated with soil P availability, and it was significantly higher in non-fertilized treatments than in P-fertilized treatments for both rhizosphere and bulk soils. A stronger competition among phoD-harboring microorganisms was detected in non-fertilized soil than in P-fertilized soil, with Bradyrhizobium, Methylobacterium, and Methylomonas being the dominant taxa in all samples. However, the high phoD gene abundance under P-poor condition was mainly due to the growth of rare operational taxonomic units (OTUs) affiliated to Actinobacteria and Cyanobacteria (relative abundance

Subfields: Ecology, Plant Science, Soil Science

View Paper: https://www.semanticscholar.org/paper/c50321ff68aebb9df62b4f3324707bac001c954d