不同居群山丹的核型分析

Karyotype Analysis of Different Populations of Lilium pumilum DC.

采用常规压片法对25个居群的山丹（Lilium pumilum DC.）进行了核型分析研究。结果表明：25个山丹居群间的核型存在一定的多样性。各居群山丹均为二倍体种,染色体基数为x=12,根尖细胞中的染色体数目为2n=2x=24。山丹染色体类型有st、sm、t、m、T。最长与最短染色体的比值在1.73-5.90之间,多数在2-4之间;不对称系数介于75.60%-89.60%之间;核型有3A、4A、3B、4B、3C、4C 6种类型,其中以3B类型最多,占60%。

The karyological analysis on 25 populations of Lilium pumilum was studied by conventional pressed slice method. The results showed that the karyological type on 25 populations of L. pumilum was various. Each popu- lations of L. pumilum were diploid,x = 12. In mot tip cells,chromosome numbers was mostly 2n =2x = 24. Chromo- some types of L. pumilum included st, sm, t, m and T. The ratio of the longest chromosome/the shortest chromosome was from 1.73 to 5.90, mostly in the range from 2 to 4. While asymmetry coefficient was between 75.60% and 89. 60%. Six types inclucled 3A ,4A ,3B ,4B ,3C ,4C, and 3B was the most type, accounted for 60%.