伞形科3个种5个居群的核型分析

Studies on Karyotypes of Five Populations of Three Species in Umbelliferae from China

对伞形科前胡属(PeucedanumL.)2个种以及羌活属(NotopterygiumH.Boiss.)1个种3个居群的染色体数目和核型进行了研究。研究表明,它们的染色体数目均为2n=22,核型公式可分别表示为长前胡:2n=2x=22=22 m(1 SAT),属1A型;松潘前胡:2n=2x=22=20 m+2 sm,属2A型;宽叶羌活的3个居群分别是:马边大风顶居群1为2n=2x=22=6 m+12 sm+4 st,属2A型;马边大风顶居群2为2n=2x=22=12 m+4 sm+6 st,属2B型;屏山老君山居群为2n=2x=22=4 m+14 sm+4 st,属2A型。其中长前胡和松潘前胡的染色体数目和核型为首次报道。

This paper reports the chromosome numbers and karyotypes of two species of genus Peucedanum L. and three populations of Notopterygiumforbesii in Umbelliferae. Among them, the somatic chromosome numbers and karyotypes of two species of Peucedanum are reported for the first time. The chromosome numbers of all species are 2n = 22. The karyotype of P. turgeniifolium only consists of metacentric chromosomes and P. songpanense consists of metacentric and submetacentric chromosomes. The karyotypes of all three populations of N. forbesii are composed of metacentric, submetacentric and acrocentric chromosomes. The karyotype of P. turgeniifolium Wolff belongs to ＂1A＂and P. songpanense belongs to ＂2A＂. In the three populations of N.forbesii ,the population of Mabianshan 1 （ altitude ： 1 820 m） and that of Laojunshan （ altitude ： 1 950 m） belong to type of ＂2A＂, but that of Mabianshan 2 （ altitude ：2 610 m） belongs to type of ＂2B＂.