Rare Bacterial Assembly in Soils Is Mainly Driven by Deterministic Processes

文献类型： 外文期刊

第一作者： Xu, Qicheng

作者： Xu, Qicheng;Ling, Ning;Guo, Junjie;Guo, Shiwei;Shen, Qirong;Xu, Qicheng;Ling, Ning;Quaiser, Achim;Vandenkoornhuyse, Philippe;Ruan, Jianyun

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关键词： Bacterial assembly; Rare biosphere; Tea garden soils; Deterministic process; Stochastic process; Null model framework

期刊名称：MICROBIAL ECOLOGY （ 影响因子：3.356； 五年影响因子：3.862 ）

ISSN： 0095-3628

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收录情况： SCI

摘要： Rare species are crucial components of the highly diverse soil microbial pool and over-proportionally contribute to the soil functions. However, much remains unknown about their assembling rules. The biogeographic patterns and species aggregations of the rare bacterial biosphere were assessed using 140 soil samples from a gradient of 2000 km across the main tea-producing areas in China. About 96% OTUs with similar to 40% sequences were classified as rare taxa. The rare bacterial communities were significantly affected by geographical regions and showed distance-decay effects, indicating that the rare bacteria are not cosmopolitan, they displayed a pattern of limited dispersal and were restricted to certain sites. Variation partitioning analysis (VPA) revealed that environmental variation and spatial factors explained 12.5% and 6.4%, respectively, of the variance in rare bacterial community. The Mantel and partial Mantel tests also showed that the environmental factors had stronger (similar to 3 times) impacts than spatial factors. The null model showed that deterministic processes contributed more than stochastic processes in rare bacterial assembly (75% vs. 25%). There is likely an enrichment in ecological functions within the rare biosphere, considering this high contribution of deterministic processes in the assembly. In addition, the assembly of rare taxa was found to be mainly driven by soil pH. Overall, this study revealed that rare bacteria were not cosmopolitan, and their assembly was more driven by deterministic processes. These findings provided a new comprehensive understanding of rare bacterial biogeographic patterns and assembly rules.

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