Yield differences between Bt transgenic rice lines and their non-Bt counterparts, and its possible mechanism

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• 作者：Fei Wang^a ; ^b ; Cheng Ye^a ; ^b ; Liyang Zhu^a ; ^b ; Lixiao Nie^a ; ^b ; Kehui Cui^a ; ^b ; Shaobing Peng^a ; ^b ; Yongjun Lin^a ; Jianliang Huang^a ; ^b ; ^{jhuang@mail.hzau.edu.cn}
• 关键词：Bt transgenic rice ; Grain filling percentage ; Grain yield ; Growth-promoting phytohormones
• 刊名：Field Crops Research
• 出版年：2012
• 出版时间：14 February 2012
• 年：2012
• 卷：126
• 期：Complete
• 页码：8-15
• 全文大小：470 K

文摘

Several papers reported that the incorporation of Bt genes into rice caused morphological and physiological changes. In this paper, we try to reveal whether the incorporation of a Bt gene (cry1C* or cry2A*) into Minghui63 (MH63) and Shanyou63 (SY63) will affect the yield performance, and its agronomic and physiological mechanism underlying the yield differences. Field experiments were conducted in 2009 and 2010 at Zhangbang village, Wuxue city (29¡ã51¡äN 115¡ã33¡äE) and Dongshantou village, Xiaonan county (30¡ã56¡äN 113¡ã54¡äE), Hubei Province, China from May to October. Treatments were arranged in a randomized complete block design with three replications, and each replication contained three genotypes in 2009 and six genotypes in 2010. No significant differences in grain yield, biomass, leaf area index (LAI), nitrogen accumulation and growth-promoting phytohormones content were observed between MH63 (cry2A*) and MH63, except that MH63 (cry2A*) had significantly lower grain yield than MH63 at Wuxue city in 2009. MH63 (cry1C*) had lower grain yield than MH63 and MH63 (cry2A*) at all site-years, and the yield reduction was mainly ascribed to the reduced grain filling percentage. Growth analysis revealed there were no differences in biomass production and nitrogen accumulation between MH63 (cry1C*) and MH63. The incorporation of cry1C* brought a significant reduction in the content of growth-promoting phytohormones in the superior spikelets, which highly correlated with grain filling percentage of MH63, MH63 (cry1C*) and MH63 (cry2A*). There were no significant differences on grain yield and growth performance among all the three hybrids by crossbreeding MH63, MH63 (cry1C*) and MH63 (cry2A*) with Zhenshan 97A. More endeavors are encouraged to examine the physiological and genetic mechanisms behind the variations.