根虫对Bt的耐药性与Bt蛋白和RNA干扰组合的玉米金字塔损伤增加有关
Bruce E Tabashnik1, Yves Carrière1
1Department of Entomology, University of Arizona, Tucson, AZ 85721.
概括
在转基因作物中,玉米根虫对杀虫蛋白的耐药性正在增加. 具有多个特征的金字塔效率较低,导致产量损失,需要综合性害虫管理策略.
科学领域:
- 农业科学 农业科学
- 昆虫学 昆虫学是一门学科.
- 遗传学 遗传学 是一个
背景情况:
- 转基因作物产生Bacillus thuringiensis (Bt) 杀虫蛋白质的转基因作物彻底改变了害虫控制.
- 昆虫耐药性的演变降低了单特征Bt作物的有效性,导致了多特征金字塔的发展.
- 玉米根虫在美国造成大量的收获损失,需要有效的耐药性管理.
研究的目的:
- 研究转基因玉米金字塔对西方和北方玉米根虫的疗效.
- 评估根虫对Bt蛋白 (Cry3Bb,Gpp34/Tpp35Ab) 和RNA干扰 (DvSnf7) 的耐药性对金字塔性能的影响.
- 评估降低金字塔功效对作物损伤和甲虫出现的影响.
主要方法:
- 分析了2005年至2023年期间进行的12项已发表的实地研究中的998个数据值.
- 专注于对Bt蛋白Cry3Bb,Gpp34/Tpp35Ab的耐药性,以及玉米根虫中的DvSnf7RNA干扰特征.
- 评估根损伤和成年甲虫的出现,作为金字塔疗效的指标.
主要成果:
- 根虫对Bt蛋白Cry3Bb和Gpp34/Tpp35Ab的耐药性显著降低了含有这些特征的金字塔的有效性.
- 嵌入Bt蛋白和DvSnf7RNA干扰特征的金字塔对抗耐药根虫种群的有效性降低.
- 与减少成年甲虫的出现相比,DvSnf7在减少根损伤方面的疗效较低.
结论:
- 根虫对特定Bt蛋白质的耐药性损害了当前转基因玉米金字塔的有效性.
- 综合性害虫防治策略,包括作物轮换和各种控制策略,对于可持续的根虫控制至关重要.
- 部署具有高效,非交叉耐药性特征的金字塔对于延迟进一步的耐药性进化至关重要.
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