Effects of rhizobial inoculation, cropping systems and growth stages on endophytic bacterial community of soybean roots

文献类型： 外文期刊

第一作者： Zhang, Yun Zeng

作者： Zhang, Yun Zeng;Wang, En Tao;Li, Mao;Li, Qin Qin;Zhang, Yan Ming;Chen, Wen Feng;Chen, Wen Xin;Zhao, Shuang Jin;Jia, Xiu Ling;Zhang, Li Hua;Wang, En Tao

作者机构：

关键词： Endophytic bacterial community;Soybean root;Rhizobial inoculation;Intercropping

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期： 2011 年 347 卷 1-2 期

页码：

收录情况： SCI

摘要： The effects of rhizobial inoculation, soybean-maize intercropping and plant growth stages on the diversity of soybean root endophytic bacteria were evaluated. PCR-based terminal restriction fragment length polymorphism (T-RFLP) of 16S rRNA genes and analyses of cloned partial 16S rRNA gene libraries were used to study the endophytic bacterial communities. The root endophytic bacterial populations during the whole growing season was significantly affected by the three factors analyzed, with plant growth and rhizobial inoculation showing the highest and lowest impact. The alphaproteobacteria and betaproteobacteria were the most predominant endophytes of soybean roots. Some undefined bacterial lineages were also found, indicating that the root endophytic populations might constitute an important source for the isolation of novel bacteria. Bradyrhizobium liaoningense (used as inoculant) occupied most of the soybean nodules formed and Sinorhizobium americanum-related bacteria were detected as the main root endophytes. Results also suggest that bacteria might be transferred from nodules to roots (as endophytic bacteria) when the seeds become mature, which might be a possible process in the life cycle of rhizobia. Rhizobial inoculation and intercropping practices could increase the diversity of the soybean root endophytes, which might have a positive influence on the growth of soybean plants.

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