利用幼叶观察染色体,早已在植物上应用。它的主要意义在于,在待研究的植株极少,又不易得到种子或种子量极少的情况下,可进行染色体鉴定,因此采用叶片进行染色体制片有其实用价值。而且用叶片所获得的分裂相,无论在数量上或质量上都不次于根尖。我们用油菜幼叶观察了染色体,效果较好,其方法如下: The use of young leaves to observe chromosomes has long been used in plants. Its main significance is that it can be used to identify chromosomes when there are few plants to be studied and the seeds are not easy to be obtained or the amount of seeds is extremely small. Therefore, it is of practical value to make chromosomes with leaves. Moreover, the split phase obtained with leaves is inferior to the root tip both in quantity and in quality. We observed the chromosomes with rapeseed leaves, the effect is better, the method is as follows: