一个米P450 CYP709B2通过代谢排毒赋予双重除草剂耐药性
Xiangning Su1, Chuanying Li1, Xuesong Liu2
1Research Institute of Plant Protection, Guangdong Academy of Agricultural Sciences & Key Laboratory of Green Prevention and Control of Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs & Key Laboratory of High Technology for Plant Protection of Guangdong Province, Guangzhou 510640, China.
Journal of agricultural and food chemistry
|December 12, 2025
概括
酵素CYP709B2可以排毒有害的除草剂异素 (IPU) 和亚特拉 (ATZ). 过度表达这种基因会增强作物耐药性,减少大米和谷物中的除草剂残留物.
科学领域:
- 生物化学 生物化学
- 植物科学 植物科学
- 环境科学 环境科学
背景情况:
- 除草剂,如异原 (IPU) 和亚特拉 (ATZ),由于过度的残留物,造成环境和健康风险.
- 米是主食作物,使其易受除草剂污染的敏感性成为食品安全的重大问题.
研究的目的:
- 确定涉及IPU和ATZ的排毒和催化作用的关键大米酶.
- 评估已识别的酶作为开发抗除草剂耐药大米品种的目标的潜力.
主要方法:
- 在暴露于除草剂时,对大米细胞染色体P450酶的基因表达分析.
- 转基因大米过度表达CYP709B2 (OE线) 的生成和特征.
- 产生和表征CRISPR/Cas9产生的CYP709B2淘汰突变体 (Cas9线).
- 用代谢分析分析量化不同大米组织中的除草剂残留物及其代谢物.
主要成果:
- CYP709B2的表达是由IPU和ATZ特别诱导的.
- OE系显示对IPU/ATZ的抗性增强,在包括谷物在内的组织中减少除草剂的积累.
- 与野生类型大米相比,Cas9系表现出更高的敏感性和更高的除草剂积累.
- 代谢分析证实了OE线中IPU/ATZ的加速代谢和Cas9线的降低代谢.
结论:
- 米CYP709B2是IPU和ATZ的代谢解毒和降解的关键酶.
- CYP709B2代表了一种有前途的遗传标,用于在大米中培养抗除草剂的基因.
- 开发耐药作物可以减轻与这些除草剂相关的环境污染和食品安全风险.
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