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目的改进大葱减数分裂观察的实验教学；观察秋水仙碱（ＣＯＭ）对大葱减数分裂的影响及可能的机制。方法采用不同ＣＯＭ浓度和不同ＣＯＭ处理时间来观察减数分裂指数（ＭｅＩ）的变化。结果ＣＯＭ的浓度在５０μｇ／ｍｌ，处理时间为２４小时左右时，ＭｅＩ值最高；ＣＯＭ与微管的结合是可逆的，并且可以影响细胞ＤＮＡ的合成。结论ＣＯＭ可以有效地影响大葱减数分裂并使ＭｅＩ值显著增大；同时也使大葱减数分裂观察的实验教学得以改进。
Objective To improve the experimental teaching of observation of meiosis of Welsh onion, and to observe the effect of colchicine (COM) on meiosis of Welsh onion and its possible mechanism. Methods The meiosis index (MeI) was observed using different COM concentrations and different COM treatment times. Results When the concentration of COM was 50μg/ml and the treatment time was about 24 hours, the MeI value was the highest. The combination of COM and microtubules was reversible and could affect the DNA synthesis of cells. Conclusion COM can effectively affect the meiosis of Welsh onion and increase the MeI value significantly. At the same time, it also improves the experimental teaching of meiotic observation of Welsh onion.