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首页> 外文期刊>Systematic and Applied Microbiology >Genomic diversity of chickpea-nodulating rhizobia in Ningxia (north central China) and gene flow within symbiotic Mesorhizobium muleiense populations
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Genomic diversity of chickpea-nodulating rhizobia in Ningxia (north central China) and gene flow within symbiotic Mesorhizobium muleiense populations

机译：宁夏（中国北部中部）和基因流动中鹰嘴豆根瘤菌的基因组多样性和体系中叶氏植物的基因流动

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Diversity and taxonomic affiliation of chickpea rhizobia were investigated from Ningxia in north central China and their genomic relationships were compared with those from northwestern adjacent regions (Gansu and Xinjiang). Rhizobia were isolated from root-nodules after trapping by chickpea grown in soils from a single site of Ningxia and typed by IGS PCR-RFLP. Representative strains were phylogenetically analyzed on the basis of the 16S rRNA, housekeeping (atpD, recA and gln11) and symbiosis (nodC and nifH) genes. Genetic differentiation and gene flow were estimated among the chickpea microsymbionts from Ningxia, Gansu and Xinjiang. Fifty chickpea rhizobial isolates were obtained and identified as Mesorhizobium muleiense. Their symbiosis genes nodC and nifH were highly similar (98.4 to 100%) to those of other chickpea microsymbionts, except for one representative strain (NG24) that showed low nifH similarities with all the defined Mesorhizobium species. The rhizobial population from Ningxia was genetically similar to that from Gansu, but different from that in Xinjiang as shown by high chromosomal gene flow/low differentiation with the Gansu population but the reverse with the Xinjiang population. This reveals a biogeographic pattern with two main populations in M. muleiense, the Xinjiang population being chromosomally differentiated from Ningxia-Gansu one. M. muleiense was found as the sole main chickpea-nodulating rhizobial symbiont of Ningxia and it was also found in Gansu sharing alkaline-saline soils with Ningxia. Introduction of chickpea in recently cultivated areas in China seems to select from alkaline-saline soils of M. muleiense that acquired symbiotic genes from symbiovar ciceri. (C) 2020 Elsevier GmbH. All rights reserved.
机译：鹰嘴豆根瘤菌的多样性和分类症来自宁夏在中国北部宁夏以及西北邻近地区（甘肃和新疆）的基因组关系。在从宁夏的单一部位的土壤中捕获并被IGS PCR-RFLP键入，从根结节中分离出根瘤菌。基于16S rRNA，家政（ATPD，RECA和GLN11）和共生（NODC和NIFH）基因的代表性菌株在系统发育地分析。宁夏，甘肃和新疆的鹰嘴豆微氨基硫化术中估计了遗传分化和基因流。获得五十龟氏毒物分离株，并将其鉴定为Mesorhizobium muleiense。除了与所有已定的胚芽升沸石物种显示出低NiFH相似之处之外，它们的共混物基因和NiFH与其他鹰嘴豆微生物的相似（98.4〜100％）高度相似（98.4至100％）。来自宁夏的根瘤菌种群与甘肃的根本类似，但与新疆不同的不同，如高染色体基因流量/低分化与甘肃人群，但与新疆人口相反。这揭示了在Muleiense的两种主要种群的生物地理图案，新疆人口从宁夏甘肃染色体分析。 M.Muleiense被发现是宁夏的唯一主要鹰嘴豆根瘤菌，它也被发现在甘肃分享宁夏碱性盐水土壤。鹰嘴豆在中国最近耕种地区似乎选择了来自Muleiense的碱性生理盐水，从Symbiovar Ciceri获得了共生基因。 （c）2020 Elsevier GmbH。版权所有。

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