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《Acta Ecologica Sinica》 2012-11
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Community structure and abundance dynamics of soil collembolans in transgenic Bt rice paddyfields

ZHU Xiangyu1,LI Zhiyi1,CHANG Liang2,YUAN Yiyang2,GE Feng2,WU Gang3,CHEN Fajun1, 1 Department of Entomology,College of Plant Protection,Nanjing Agricultural University,Laboratory of Insect Information and Ecology,Nanjing 210095,China 2 Institute of Zoology,Chinese Academy of Sciences,Beijing 100101,China 3 Department of Plant Protection,Huazhong Agricultural University,Wuhan 430070,China  
Rice is the most important food crop in the world,which feeds half of the world′s human population.However the potentially ecological risk of transgenic Bt crops has been being one of the most important issues since the first biotech Bt crop was developed in 1986.Collembolan,one of the key functional groups of soil animals,has been widely used as bioindicator to monitoring soil environmental quality and ecological safety,owing to its large quantity of species and abundances,and the sensitive response to environmental disturbance.The effects of transgenic Bt rice on the community composition and abundance dynamics of soil collembolans were investigated by using the restorer lines,Kemingdao with Cry1Ab and Huahui-1 with Cry1Ab+Cry1Ac,and the hybrid Bt-SY63 with Cry1Ab+Cry1Ac in Shandong,China in 2010.Their respective nontransgenic parent control lines,Xiushuidao,Minghui-63 and Shanyou-63,were used as control.Some specifically rare groups of soil collembolan(e.g.,Arrhopalites,Cribrochiurus and Isotoma for the pure-transgene restorer,Arrhopalites for the dual-transgene restorer,and Isotoma for the dual-transgene hybrid) were disappeared due to the planting of Bt rice.There were significant effects of Bt rice on the abundances dynamics of the hemiedaphic and euedaphic groups and total soil collembolans.However there was no significant effect on the genus richness and community diversity and evenness.Compared with nontransgenic control rice,the Cry1Ab Bt rice significantly increased the abundances of hemiedaphic group and total soil collembolans,and genus richness by 54.7%,44.4%,26.7%,respectively.The proportion of Hypogastrura and the abundance of Euedaphic group in the paddyfields of hybrid of Cry1Ab+Cry1Ac Bt rice increased by 212.3% and 180.4,compared with its nontransgenic parent control line.Comparison between the two restorer lines with Cry1Ab or Cry1Ab+Cry1Ac showed that the proportion of Onychiurus,,Hypogastrura Proisotoma,and the abundance of hemiedaphic group decreased by 62.1%,56.7%,61.8% and 43.4% respectively,and Folsomides increased by 88.2% in the paddyfields of Cry1Ab+Cry1Ac Bt rice.Comparison between the restorer line and hybrid with Cry1Ab+Cry1Ac,Cry1Ab+Cry1Ac rice increased the proportion of Hypogastrura and Proisotoma,by 312.9%,and 171.6%,the abundances of Hemiedaphic groups by 302.4%,the total soil collembolans 233.2%,as well as genus richness 54.0% and community diversity 26.7%,respectively.However it significantly decreased proportion of Folsomides by 65.5%.The results indicated that the adoption of transgenic Bt rice hybrid can improve the community stability and individual abundances of soil collembolan flora in paddyfield.
【Fund】: 转基因生物新品种培育重大专项课题(2009ZX08012-005B 2011ZX08012-005 2011ZX08011-002);; 教育部霍英东基金(122033);; 高等院校基本科研业务费项目(KYZ201140)
【CateGory Index】: S511
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