The epidemicity of facultative microsymbionts in faba bean rhizosphere soils

文献类型： 外文期刊

第一作者： Xiong, Hui Yang

作者： Xiong, Hui Yang;Zhang, Xing Xing;Guo, Hui Juan;Ji, Yuan Yuan;Li, Ying;Wang, Xiao Lin;Zhao, Wei;Mo, Fei Yu;Chen, Jin Cheng;Chen, Wen Xin;Tian, Chang Fu;Yang, Tao;Zong, Xuxiao

作者机构：

关键词： Biogeography;Epidemicity;Legume;Rhizobia;Symbiosis;Vicia faba

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：7.609； 五年影响因子：8.312 ）

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收录情况： SCI

摘要： AbstractThe epidemicity of bacteria facultatively associated with eukaryotes, involves not only housekeeping genes but also genes linked with the pathogenesis and symbiosis. Here, by characterizing both housekeeping (rpoBand 16S rRNA gene) and nodulation (nodD) genes, we explore processes shaping epidemic patterns of facultative microsymbionts from rhizosphere soils of faba bean in three ecoregions. Although total bacterial communities in rhizosphere were not significantly differentiated across ecoregions,rpoBamplicon sequencing uncovered thatRhizobium laguerreaeandRhizobium anhuiensewere predominant in different samples with contrasting pH or salt content. However,R.?anhuiensecan outcompeteR.?laguerreaein certain sterilized soils whereR.?laguerreaeoriginally dominated, andviceversa. Contrasting bacterial taxa associated with eitherR.?laguerreaeorR.?anhuiensein soils. The biogeographical pattern ofnodDwas more clear than that of rhizobial species in both rhizosphere soils and nodules. Competitive nodulation experiments demonstrated a hierarchical selection onnodDgenotypes and their genomic backgrounds by faba bean cultivars. Taken together, abiotic and biotic factors in soils and the selection by legume hosts are either indirectly or directly involved in shaping rhizobial species-level taxonomic biogeography, which however cannot be used to infer spatial patterns of nodulation gene.Highlights?No significant biogeography of bacteria was found in rhizosphere soils of faba bean.?A strong biogeography ofnodDgenotypes exists in rhizosphere soils and nodules.?The biogeography ofnodDis incoherent with that ofRhizobiumspecies in nodules.?Hosts shed hierarchical selections onnodDgenotypes andRhizobiumspecies.]]>

分类号： S1

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