Effects of repeated cultivation of transgenic Bt cotton on functional bacterial populations in rhizosphere soil |
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Authors: | Hai-Yan Hu Xiao-Xia Liu Zhang-Wu Zhao Jian-Guang Sun Qing-Wen Zhang Xing-Zhong Liu Yong Yu |
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Institution: | (1) College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100094, China;(2) Department of Agro-microbial Resource and Utilization, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China;(3) Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China;(4) Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China |
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Abstract: | The impact of multiple-year (0–5 years) cultivation of transgenic Bacillus thuringiensis (Bt) cotton on the functional bacterial populations in rhizosphere soil was investigated. The transgenic Bt + CpTI cotton
line SGK321 and a non-Bt cotton line Shiyuan321 were planted in four fields in which Bt cotton had been continuously cultivated
for 0, 1, 3, and 5 years. Rhizosphere soil samples were collected at the seedling, squaring, flower and boll, and boll-opening
stages of cotton. Numbers of bacteria involved in nitrogen-fixing, organic phosphate-dissolving, inorganic phosphate-dissolving,
and potassium-dissolving were measured with cultivation-dependent approaches. The data presented here showed no consistent
statistically significant differences in the numbers of different groups of functional bacteria between rhizosphere soil of
Bt and non-Bt cotton in the same field, and no obvious trends in the numbers of the various group of functional bacteria with
the increasing duration of Bt cotton cultivation. These studies suggest that multiple-year cultivation of transgenic Bt cotton
may not affect the functional bacterial populations in rhizosphere soil. |
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Keywords: | Functional bacteria Repeated cultivation Rhizosphere soil Transgenic Bt cotton |
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