Efficacy of insect-resistance Bt/CpTI transgenes in F 5 –F 7 generations of rice crop–weed hybrid progeny: implications for assessing ecological impact of transgene flow

摘要: Ecological impact of transgene flow into populations wild/weedy relatives is associated with fitness effects in hybrid progeny. Most studies assessing focus essentially on early-generation However, whether the transgenes remain effective and durable advanced generations progeny remains unclear. We conducted a common garden experiment F5–F7 derived from crosses between insect-resistant transgenic (Bt/CpTI) rice weedy rice, to examine their insect resistance Hybrid were grown under different pressures cultivation modes where damage fitness-related traits measured same growth season. Plants showed significantly lower (10 % vs. 32 %) higher fecundity (551 392 seeds/plant) than those without populations, suggesting efficacy for resistance. Fitness benefits similar among indicating stability effects. A positive correlation index change was detected, stressing important role ambient caused by insect-resistance transgenes. Our results have implications ecological impacts relatives. For cost-effectiveness, experimental estimation probably sufficient based data hybrids early generations. Given that are pressure, risk assessment should consider this variable design, reasonably reflecting actual situations populations.