Effects of seed mixture sowing with transgenic Bt rice and its parental line on the population dynamics of target stemborers and leafrollers, and non-target planthoppers

• 来源期刊: 中国昆虫科学（英文版）
• 关键词: cultivar diversity occurrence and damage seed mixture sowing target and non-target pests transgenic Bt rice yield
• 年，卷（期）: 2019,（4）
• 页码范围: 777-794
• 页数: 18页
• 语种: 英文
• DOI: 10.1111/1744-7917.12571

摘要

The widespread planting of insect-resistant crops has caused a dramatic shift in agricultural landscapes,thus raising concerns about the potential impacts on both target and non-target pests.In this study,we examined the potential effects of intra-specific seed mixture sowing with transgenic Bt rice (Bt) and its parental non-transgenic line (Nt) (100％ Bt rice [Bt100],5％ Nt+95％ Bt [Nt0sBt95],10％ Nt+90％ Bt [Nt10Bt90],20％ Nt+80％ Bt [Nt20Bt80],40％ Nt-+-60％ Bt [Nt40Bt60] and 100％ Nt rice [Nt100]) on target and non-target pests in a 2-year field trial in southern China.The occurrence of target pests,Sesamia inferens,Chilo suppressalis and Cnaphalocrocis medinalis,decreased with the increased ratio of Bt rice,and the mixture ratios with more than 90％ Bt rice (Bt100 and Nt05Bt95)significantly increased the pest suppression efficiency,with the lowest occurrences of non-target planthoppers,Nilaparvata lugens and Sogatellafurcifera in Nt100 and Nt05Bt95.Furthermore,there were no significant differences in 1000-grain dry weight and grain dry weight per 100 plants between Bt100 and Nt05Bt95.Seed mixture sowing of Bt rice with ≤ 10％ (especially 5％) of its parent line was sufficient to overcome potential compliance issues that exist with the use of block or structured refuge to provide most effective control of both target and non-target pests without compromising the grain yield.It is also expected that the strategy of seed mixture sowing with transgenic Bt rice and the non-transgenic parental line would provide rice yield stability while decreasing the insecticide use frequency in rice production.