为了探讨菘蓝Isatis indigoticaFort.与生药鉴定有关的种内变异,对19个不同栽培居群的板蓝根样品进行了实验研究.结果表明;不同居群的板蓝根在性状上可分为胶质和粉质两大类,它们的显微组织特征虽基本相同,但淀粉粒的大小、复粒数量占淀粉粒总数的比例不仅在两大类之间有显着差异,不同居群之间也有较明显的差异.聚类分析结果显示;不同栽培居群板蓝根性状特征的改变与淀粉粒特征的改变有关.经异地栽培试验证实,这种变异可能是遗传因素所致.在观察中还发现所有居群板蓝根淀粉粒均有偏光现象,但未见多脐点和半复粒淀粉粒存在.

For the purpose to explore the variations occurred in the cultivation of Isatis indigotica Fort. that may affect its pharmacognostic identif-ication,19 samples of Radix Isatidis from different cultivated populations were collected and examined.On characteristic features,these samp-les could be classified into two categorys:those that were gummy and those that were starchy.On microstructural examination,they were essent-ially similar,but with different sizes of starch grains and ratio between the number of compounded starch grains to the number of total star-ch grains.Result of clustering analysis showed that the variations of starch grains and change of character were interrelated.Experiment of field cultivation in different localities proved that the variation might be genetically related.In addition,polarizing phenomenon could be observed in all starch grains of different samples.Semi-compound starch grains or multihilum simple starch grains were not found by polarizi-ng microscope.