Abstract: Treated with 0.05% and 0.1% colchicine solution by controlling time, effects of different colchicine concentrations and different treatment times on onion root tip distortion were researched. The results showed that colchicine had the ability to promote cell mitosis and stagnate cell chromosome in medium term. Different fixation times had effects on the mitosis of onion root tip cells. Colchicine had a distorted effect on onion root tip cells, and the ability to induce distortion could be influenced by colchicine solution concentration and treatment time.

Key words: colchicine, structure variation, onion

摘要： 用0.05%和0.1%秋水仙素溶液对洋葱Allium cepa根尖进行控时处理，研究不同秋水仙素浓度和不同处理时间对洋葱根尖细胞有丝分裂畸变的影响。结果显示，秋水仙素有促进细胞有丝分裂染色体停滞在中期的能力；不同固定时间对洋葱根尖细胞有丝分裂有影响；秋水仙素对洋葱根尖细胞染色体有畸变效应，诱导产生畸变的能力受溶液浓度和处理时间的影响。

关键词: 秋水仙素, 结构变异, 洋葱