A highly conserved core bacterial microbiota with nitrogen-fixation capacity inhabits the xylem sap in maize plants

文献类型： 外文期刊

第一作者： Zhang, Liyu

作者： Zhang, Liyu;Zhang, Meiling;Huang, Shuyu;Yuan, Liang;Wen, Yanchen;Li, Dongchu;Zhang, Lu;Xu, Xinpeng;He, Ping;Zhou, Wei;Ai, Chao;Li, Lujun;Gao, Qiang;Wang, Yin;Zhang, Shuiqing;Huang, Shaomin;Liu, Kailou;Yu, Xichu;Wei, Hailei;Philippot, Laurent

作者机构：

期刊名称：NATURE COMMUNICATIONS （ 影响因子：17.694； 五年影响因子：17.763 ）

ISSN：

年卷期： 2022 年 13 卷 1 期

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收录情况： SCI

摘要： The plant xylem microbiota remains understudied. Here, the authors characterise the xylem microbiota in maize plants finding that some bacteria carried N fixing genes. By using synthetic communities the authors confirm that xylem inhabiting and N fixing bacteria provide the host plant with N. Microbiomes are important for crop performance. However, a deeper knowledge of crop-associated microbial communities is needed to harness beneficial host-microbe interactions. Here, by assessing the assembly and functions of maize microbiomes across soil types, climate zones, and genotypes, we found that the stem xylem selectively recruits highly conserved microbes dominated by Gammaproteobacteria. We showed that the proportion of bacterial taxa carrying the nitrogenase gene (nifH) was larger in stem xylem than in other organs such as root and leaf endosphere. Of the 25 core bacterial taxa identified in xylem sap, several isolated strains were confirmed to be active nitrogen-fixers or to assist with biological nitrogen fixation. On this basis, we established synthetic communities (SynComs) consisting of two core diazotrophs and two helpers. GFP-tagged strains and N-15 isotopic dilution method demonstrated that these SynComs do thrive and contribute, through biological nitrogen fixation, 11.8% of the total N accumulated in maize stems. These core taxa in xylem sap represent an untapped resource that can be exploited to increase crop productivity.

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