Wheat rhizosphere harbors a less complex and more stable microbial co-occurrence pattern than bulk soil

根际 生态系统 大块土 微生物种群生物学 群落结构 农学 生物 土壤水分 植物 生态学 细菌 遗传学
作者
Kunkun Fan,Pamela Weisenhorn,Jack A. Gilbert,Haiyan Chu
出处
期刊:Soil Biology & Biochemistry [Elsevier]
卷期号:125: 251-260 被引量:255
标识
DOI:10.1016/j.soilbio.2018.07.022
摘要

The rhizosphere harbors complex microbial communities, whose dynamic associations are considered critical for plant growth and health but remain poorly understood. We constructed co-occurrence networks for archaeal, bacterial and fungal communities associated with the rhizosphere and bulk soil of wheat fields on the North China Plain. Rhizosphere co-occurrence networks had fewer nodes, edges, modules and lower density, but maintained more robust structure compared with bulk soil, suggesting that a less complex topology and more stable co-occurrence pattern is a feature for wheat rhizosphere. Bacterial and fungal communities followed a power-law distribution, while the archaeal community did not. Soil pH and microbial diversity were significantly correlated with network size and connectivity in both rhizosphere and bulk soils. Keystone species that played essential roles in network structure were predicted to maintain a flexible generalist metabolism, and had fewer significant correlations with environmental variables, especially in the rhizosphere. These results indicate that distinct microbial co-occurrence patterns exist in wheat rhizosphere, which could be associated with variable agricultural ecosystem properties.
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