在欧洲玉米虫中遗传对细菌灵虫毒素 (Dipel ES) 的耐药性
1Department of Entomology, Kansas State University, Manhattan, KS 66506, USA. U.S. Department of Agriculture, Agricultural Research Service Grain Marketing and Production Research Center, 1515 College Avenue, Manhattan, KS 66502, USA (retired).
Science (New York, N.Y.)
|May 13, 1999
概括
与其他昆虫不同的是,欧洲玉米对Bacillus thuringiensis (Bt) 毒素的耐药性不完全占主导地位. 这一发现可能会影响Bt玉米耐药性管理策略的有效性.
科学领域:
- 农业昆虫学 农业昆虫学
- 昆虫遗传学 昆虫遗传学
- 虫害管理 虫害管理 虫害管理
背景情况:
- 菌 (Bt) 毒素被广泛用于杀虫.
- 转基因玉米依赖于转基因毒素来保护作物免受欧洲玉米虫等害虫的侵害.
- 耐药性管理策略,如高剂量/避难,对于维持Bt疗效至关重要.
研究的目的:
- 调查欧洲玉米 (Ostrinia nubilalis) 对商业Bt毒素配方的耐药性遗传模式.
- 将观察到的遗传模式与其他昆虫物种已知的抵抗机制进行比较.
- 评估遗传模式对当前Bt玉米耐药性管理策略的影响.
主要方法:
- 欧洲玉米种群的实验室选择具有商业Bacillus thuringiensis (Bt) 柏林毒素配方 (Dipel ES).
- 通过受控交叉和生物测试分析耐药性的遗传模式.
- 将遗传数据与关于昆虫Bt耐药性的现有文献进行比较.
主要成果:
- 在Ostrinia nubilalis中对Dipel ES的耐药性是作为一个不完全主导的自体基因遗传的.
- 这种遗传模式与其他昆虫害虫中Bt耐药性的典型衰退性质形成鲜明对比.
- 不完全的主导地位表明,在这种特定的害虫毒素相互作用中,耐药性的遗传基础不同.
结论:
- 欧洲玉米中Bt耐药性不完全占主导地位的遗传挑战了当前耐药性管理模型的假设.
- 对Bt玉米提出的高剂量/避难策略可能不那么有效,如果现场发生的耐药性遵循这种不完全占主导地位的模式.
- 需要进一步的研究,以了解现场发生的耐药性,并相应地调整管理策略,以确保Bt作物技术的长期可持续性.
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