转RRM2基因棉生长势和产量及对棉田节肢动物群落的影响

为了评估新型转基因棉花的育种价值, 评价其对棉田生态环境安全性的影响, 2012-2013年连续2年以新型转RRM2基因棉花(Gossypium hirsutum)为材料, 以其亲本‘中棉所12’为对照, 系统研究了棉田节肢动物群落的结构与组成、群落特征参数及其季节性动态变化, 同时结合气候条件分析比较了转基因棉花和非转基因棉花的生长势和产量构成因素。结果表明: 相同年份新型转RRM2基因棉田昆虫群落、害虫亚群落和天敌亚群落的结构与组成、多样性指数、均匀度指数、优势集中性指数及棉花生长期相对丰度动态变化均与对照无显著差异; 与2012年相比, 2013年转基因棉田和非转基因棉田节肢动物群落、棉花生长及产量构成因素的各项指标总体上呈下降趋势; 转基因棉田和非转基因棉田优势天敌功能团动态均滞后于优势害虫功能团, 因此棉花生长前期应适时防治棉花害虫。

Growth vigour and yield of transgenic RRM2 (RNA recognition motif 2) cotton and their effects on arthropod community in cotton field

Aims This experiment was carried out to assess the breeding value of the transgenic RRM2 (RNA recognition motif 2) cotton and to evaluate its environmental safety on cotton field.Methods The indices of structure and composition, community characteristics, biodiversity, species richness and the seasonal changes of the arthropod community in transgenic RRM2 cotton field and the parental conventional cotton field were studied systematically in 2012 and 2013, respectively. We also analyzed the climate data from June to September of the two years, and compared the cotton growth vigour and the yield parameters between the transgenic cotton and the non-transgenic cotton.Important findings The results showed that there were no significant differences in the indices of structure and composition, biodiversity, evenness, dominant concentration and the seasonal changes of insect communities and sub-communities between the transgenic cotton field and the non-transgenic cotton field within the same years. Comparing with in 2012, all the indices of arthropod communities and cotton growth vigour and cotton yield parameters in 2013 showed an overall downward trend in both the transgenic and the non-transgenic cotton fields. The dynamics of functional groups of dominant natural enemies lagged behind that of the dominant pests both in the transgenic cotton field and the non-transgenic cotton field, indicating a need to control the pests at the early stage of cotton growth.