Measuring gene flow in the cultivation of transgenic cotton (Gossypium hirsutum L.)

文献类型： 外文期刊

第一作者： Bao-Hong Zhang

作者： Bao-Hong Zhang;Xiao-Ping Pan;Teng-Long Guo;Qing-Lian Wang;Todd A. Anderson

作者机构：

关键词： transgenic cotton;pollen dispersal;Bt gene;tfd A gene;biosafety;transgene

期刊名称：MOLECULAR BIOTECHNOLOGY （ 影响因子：2.695； 五年影响因子：2.303 ）

ISSN： 1073-6085

年卷期： 2005 年 31 卷 1 期

页码：

收录情况： SCI

摘要： Transgenic Bt cotton NewCott 33B and transgenic tfd A cotton TFD were chosen to evaluate pollen dispersal frequency and distance of transgenic cotton (Gossypium hirsutum L.) in the Huanghe Valley Cotton-producing Zone, China. The objective was to evaluate the efficacy of biosafety procedures used to reduce pollen movement. A field test plot of transgenic cotton (6 x 6 m) was planted in the middle of a nontransgenic field measuring 2 10 x 210 m. The results indicated that the pollen of Bt cotton or tfd A cotton could be dispersed into the environment. Out-crossing was highest within the central test plot where progeny from nontransgenic plants, immediately adjacent to transgenic plants, had resistant plant progeny at frequencies up to 10.48%. Dispersal frequency decreased significantly and exponentially as dispersal distance increased. The flow frequency and distance of tfd A and Bt genes were similar, but the pollen-mediated gene flow of tfd A cotton was higher and further to the transgenic block than that of Bt cotton (x(2) = 11.712, 1 degree of freedom, p < 0.001). For the tfd A gene, out-crossing ranged from 10.13% at I m to 0.04% at 50 m from the transgenic plants. For the Bt gene, out-crossing ranged from 8.16% at I m to 0.08% at 20 m from the transgenic plants. These data were fit to a power curve model: y = 10.132 1x(-1.4133) with a correlation coefficient of 0.999, and y = 8.0031x(-1.483) with a correlation coefficient of 0.998, respectively. In this experiment, the farthest distance of pollen dispersal from transgenic cotton was 50 m. These results indicate that a 60-m buffer zone would serve to limit dispersal of transgenic pollen from small-scale field tests.

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