---

期 刊 ：植物保护学报 2010年

关键词：吡氟禾草灵；菊科植物；敏感性；选择性机制；膜脂质过氧化；

Keywords:fluazifop-butyl, composite plant, susceptibility, selective mechanism, lipid peroxidation,

摘 要 ：在测定35种菊科植物对除草剂吡氟禾草灵敏感性的基础上,选择部分植物从电解质漏出及丙二醛生成两方面研究吡氟禾草灵在菊科植物间的选择性及其机制。结果显示,在供试的35种受体菊科植物中只有硬毛刺苞菊、刺苞果和续断菊3种植物对吡氟禾草灵敏感,且前两者的敏感性明显高于后者,而其它32种植物即使在100μmol/L的高浓度下生长亦不受影响。进一步研究发现,对吡氟禾草灵敏感的硬毛刺苞菊和续断菊在药剂处理后均显示出大量的电解质漏出和丙二醛(MDA)生成,100 μmol/L浓度处理后96 h的电导率分别较不含药剂空白对照处理高28.56倍和1.39倍,处理后24h的丙二醛较对照高1.72倍和1.33倍,而在其它非敏感植物上均无显著差异。说明吡氟禾草灵在菊科植物间具有很高的选择性,且该选择性的形成与药剂在敏感植物上诱导膜脂质的过氧化及导致膜结构的破坏有关。

Abstract:On the basis of the determination of susceptibility of 35 species composite plants to fluazifop-butyl, the selectivity and their mechanisms in composite plants were studied with electrolyte leakage and MDA synthesis in some plants. Among 35 species tested composite plants, only Acanthospermum hispidum, Acanthospermum australe and Sonchus asper seedlings showed the susceptibility to fluazifop-butyl, while the other 32 species were tolerant to the herbicide even at 100μmol/L concentration. In the further experiment on 20 species of 35 species, the distinct electrolyte leakage and MDA synthesis were showed only in the susceptive plants seedlings of A.hispidum and S.asper. Under the treatment of 100μmol/L concentration, the conductivities were 28.56 fold and 1.39 fold higher after 96h and the MDA were 1.72 fold and 1.33 fold higher than non-herbicide control after 24h, respectively. The results suggested that fluazifop-butyl had very high selectivity to the composite plants tested, and the selective mechanism might be related to the lipid peroxidation and structure disruption of membrane in susceptive plant seedlings.

---