丙酯草醚对植物细胞有丝分裂的影响

目的]探讨丙酯草醚的除草机理。方法]以洋葱根尖为试材,探讨不同时间和不同浓度丙酯草醚对根尖分生细胞有丝分裂的影响。结果]随着丙酯草醚处理浓度的增加,洋葱根尖有丝分裂指数逐渐下降;在同一浓度下,随着处理时间的延长,有丝分裂指数也呈下降趋势。对不同处理下的洋葱根尖细胞形态观察发现,在低浓度(0.012 5%)丙酯草醚短时间(2 h)处理下,洋葱根尖分生区中仍可见中、后、末期3种分裂状态的细胞。但在超过8 h的高浓度(0.100 0%)丙酯草醚处理下,分裂态细胞明显减少,分生区有明显较多分裂中期的细胞。结论]丙酯草醚对根尖细胞的分裂有明显抑制作用,并使根尖细胞停滞于有丝分裂中期。

Effect of 2-pyrimidinyloxy-N-arylbenzylamine Derivatives on Plant Mitosis

Objective] The aim was explore the herbicidal mechanism of 2-pyrimidinyloxy-N-arylbenzylamine derivatives (ZJ0273).Method] We studied the effect of ZJ0273 on meristematic zone cells and mitosis of onion root tips . Result] The onion root tip mitotic index gradually de-creased with ZJ0273 concentration increasing,and the mitotic index also showed a decline trend with the extension of treatment time at the same concentration.The cellular morphology of onion root tip was observed at low concentrations (0.012 5%) and in short time (2 h),and three stages of division mitotic cells could be seen.But the division state cells significantly reduced in high concentration (0.100 0%) treatment after more than 8 h,and meristematic zone had more metaphase cells . Conclusion ] The mitotic index of root tips is decreased under the treatment by ZJ0273,and mitosis cells stagnate at the interphase.