中国农业科学 ›› 2026, Vol. 59 ›› Issue (9): 1887-1902.doi: 10.3864/j.issn.0578-1752.2026.09.005

• 植物保护 • 上一篇    下一篇

油菜5N对ALS抑制剂类除草剂的交互抗性机理

郭月1,2(), 张云龙1, 刘德才1, 王俊禹1, 刘湟捷1,4, 邵晓琪1,4, 彭琦1,2, 于仕程1,4, 祁余容1,4, 高建芹1, 张洁夫1, 胡茂龙1,3,4()   

  1. 1 江苏省农业科学院经济作物研究所/国家油料作物改良中心南京分中心/农业农村部长江下游棉花与油菜重点实验室, 南京 210014
    2 江苏大学食品与生物工程学院, 江苏镇江 212013
    3 江苏大学生命科学学院, 江苏镇江 212013
    4 福建农林大学农学院, 福州 350002
  • 收稿日期:2025-12-22 接受日期:2026-01-27 出版日期:2026-05-01 发布日期:2026-05-06
  • 通信作者:
    胡茂龙,E-mail:
  • 联系方式: 郭月,E-mail:guoguo23.25@163.com。
  • 基金资助:
    江苏省基础研究计划(BK20251970); 科技创新2030—重大项目(2023ZD0404203); 国家自然科学基金青年科学基金(31901503); 江苏省农业科技自主创新资金(CX(22)3084); 国家农业现代产业技术体系建设专项(CARS-12); 江苏省农业科学院科研基金(KYJJ(25)0503)

The Cross-Resistance Mechanism of Rapeseed 5N to ALS Inhibitor Herbicides

GUO Yue1,2(), ZHANG YunLong1, LIU DeCai1, WANG JunYu1, LIU HuangJie1,4, SHAO XiaoQi1,4, PENG Qi1,2, YU ShiCheng1,4, QI YuRong1,4, GAO JianQin1, ZHANG JieFu1, HU MaoLong1,3,4()   

  1. 1 Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences/Nanjing Sub-Center, National Center of Oil Crops Improvement/Key Laboratory of Cotton and Rapeseed (Nanjing), Ministry of Agriculture and Rural Affairs, Nanjing 210014
    2 School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212023, Jiangsu
    3 School of Life Sciences, Jiangsu University, Zhenjiang 212023, Jiangsu
    4 College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002
  • Received:2025-12-22 Accepted:2026-01-27 Published:2026-05-01 Online:2026-05-06

摘要:

【目的】高抗磺酰脲(SU)类除草剂油菜5N已广泛参与抗除草剂油菜育种利用,但其对其他4类ALS抑制剂类除草剂的交互抗性谱系及机制尚不清晰。本研究旨在系统评价5N对5大类ALS抑制剂的交互抗性水平,并阐明其抗性机制,为该种质的科学利用提供理论依据。【方法】通过苗期外源喷施5类ALS抑制剂类除草剂(磺酰脲-SU、磺酰胺羧基三唑啉酮-SCT、咪唑啉酮-IMI、嘧啶水杨酸-PB和三唑嘧啶-TP),鉴定其抗性水平和生物量的毒理学响应;通过体外酶活性抑制试验与实时荧光定量PCR(qRT-PCR)技术分析靶标酶敏感性及两个靶基因的表达模式;同时测定丙二醛含量及多种抗氧化酶活性以评估氧化应激响应。【结果】5N对SU和SCT类除草剂表现出16倍田间推荐浓度(16×RC)的高抗性,对IMI类为4×RC的中等抗性,对PB和TP类抗性较低;生物量毒理学响应结果与上述抗性谱趋势一致。机理研究表明:(1)靶标机制:5N的ALS酶对各类除草剂(20—300 µmol·L-1)的敏感性均显著低于N131,且其ALS的表达上调幅度与持续时间显著高于N131;(2)非靶标机制:SU和SCT类除草剂处理后,5N中丙二醛含量、超氧化物歧化酶、过氧化氢酶、过氧化物酶和谷胱甘肽还原酶活性以及解毒基因BnCYP86A2BnCYP71B3BnGST39BnGST78的表达量均显著高于N131,而在PB、IMI和TP类除草剂处理组较为复杂。【结论】油菜5N对ALS抑制剂类除草剂存在广谱但差异性的交互抗性,该抗性主要由靶标酶的低敏感性与靶基因的突变共同介导,而增强的解毒和抗氧化能力等非靶标抗性机制对抗性表型的产生也起到了辅助作用。研究明确了SCT类除草剂可作为苗期SU类的安全替代选择,并为在抗除草剂育种中合理利用5N的交互抗性性状提供了技术支撑。

关键词: 油菜, 5N, ALS抑制剂类除草剂, 交互抗性, 抗性机制

Abstract:

【Objective】The high sulfonylurea (SU) resistance germplasm 5N has been widely used in the breeding of rapeseed resistant to herbicides. However, the cross-resistance spectrum and mechanisms of 5N to the other four classes of ALS-inhibitor herbicides remain unclear. The study aims to systematically evaluate the cross-resistance level of 5N to the five classes of ALS inhibitors and elucidate its resistance mechanisms, which will provide a theoretical basis for the scientific utilization of 5N.【Method】The resistance levels and toxicological responses in biomass were detected by exogenous spraying of five kinds of ALS inhibitor herbicides (sulfonylurea-SU, sulfonlyaminocarbonyl-triazolinone-SCT, imidazolinone-IMI, pyrimidyl-benzoate-PB and triazolopyrimidine-TP) at the seedling stage. The sensitivity of the target enzyme and the expression patterns of two target genes were analyzed through in vitro enzyme activity inhibition assays and qRT-PCR. Simultaneously, malondialdehyde content and the activities of multiple antioxidant enzymes were measured to evaluate the oxidative stress response.【Result】5N exhibited the cross-resistance of high level of 16 times the recommended concentration (16×RC) to SU and SCT herbicides, mid-level of 4×RC to IMI herbicides, low level to PB and TP herbicides, which was consistent with the trend in the phytotoxic response of biomass. The mechanism revealed that: (1) Target-site mechanism: The sensitivity of the ALS enzyme in 5N to various herbicides (20-300 µmol·L-1) was significantly lower than that in N131, and the upregulated magnitude and duration of its ALS expression were notably higher than those in N131; (2) Non-target-site mechanism: After treatment with SU and SCT herbicides, the malondialdehyde content, the activities of superoxide dismutase, catalase, peroxidase, and glutathione reductase, as well as the expression levels of detoxification genes such as BnCYP86A2, BnCYP71B3, BnGST39, and BnGST78 in 5N were significantly higher than those in N131. In contrast, the responses under PB, IMI, and TP treatments were more complex and diverse.【Conclusion】5N exhibits broad-spectrum but differential cross-resistance to ALS inhibitors. This resistance is primarily mediated by both the low sensitivity of the target enzyme and mutations in the target gene, while non-target-site resistance mechanisms such as enhanced detoxification and antioxidant capacity, also have an assistant effect on the resistant phenotype. This study shows that SCT herbicides can serve as a safe alternative to SU herbicides at the seedling stage, and provides technical support for the rational utilization of the cross-resistance trait of 5N in herbicide-resistant breeding.

Key words: rapeseed (Brassica napus), 5N, ALS inhibitor herbicide, cross-resistance, resistance mechanism