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Chinese Journal of Applied Ecology ›› 2018, Vol. 29 ›› Issue (9): 2988-2996.doi: 10.13287/j.1001-9332.201809.002

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Effects of glyphosate-resistant transgenic soybean on soil rhizospheric bacteria and rhizobia.

SHEN Bin1,2, HONG Xin1,2, CAO Yue-ping3, HAN Cheng1, LIU Biao4, ZHONG Wen-hui1*   

  1. 1Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Geography Sciences, Nanjing Normal University, Nanjing 210023, China;
    2 School of Environment, Nanjing Normal University, Nanjing 210023, China;
    3 School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 200240, China;
    4 State Environmental Protection Key Laboratory of of Biosafety, Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection of China, Nanjing 210042, China.
  • Received:2017-12-11 Online:2018-09-20 Published:2018-09-20
  • Supported by:

    This work was supported by National Genetically Modified Organisms Breeding Major Project (2016ZX08012005).

Abstract: Transgenic soybean is the most widely grown genetically modified crop in the world, with herbicide resistance being the major modified trait. Microbial community is one of the most important indicators for soil quality. The effects of glyphosate-resistant transgenic soybean and glyphosate application on rhizospheric bacteria and rhizobia still remained unknown. In this study, with the non-transgenic parent Zhongdou 32 as control (CK), we investigated the effects of the G10-epsps transgenic glyphosate-resistance soybean SHZD32-01 without or with glyphosate application (abbreviated as GR and GR+G, respectively) on rhizospheric bacteria and rhizobia at different growth stages of soybean in field. Compared with CK, GR and GR+G had effects on soil pH, total organic carbon, total nitrogen and ammonium contents at the seedling and mature stages. GR significantly increased the abundance and diversity of soil rhizospheric bacterial community at the podding stage. GR+G significantly increased the abundance of soil rhizospheric bacterial community at the podding stage but decreased its diversity at the seeding and podding stages. GR and GR+G changed the relative abundance of dominant bacteria populations. Proteobacteria, Acidobacteria, Bacteroidetes, Chloroflexi, Planctomycetes and Actinobacteria were generally the dominant ones among the three treatments across all growth stages. Furthermore, GR and GR+G changed the relative abundance of rhizobia but did not change that of soybean-nodulating rhizobia, Bradyrhizobium and Sinorhizobium. The relative abundance of rhizobia in GR+G was decreased significantly at the podding stage. The abundance of actinobacteria and rhizobia was mainly affected by soil pH. Glyphosate-resistant transgenic soybean without or with glyphosate application altered soil rhizospheric bacteria and rhizobia at the podding stage, but the effects disappeared along with the growth of soybean.