Abstract: In this paper, the population genetic structure of Erigeron breviscapus in three population of Yunnan was studied by the karyotype analysis and allozyme analysis. Lijiang , Karyotype analysis indicated that all the three populations are diplontic(2n=2x=18).The karyotype formula of Lijiang population is :2n=2x=18=6m+10sm(2SAT)+2st. Ten alloz-yme analyses show that the genetic variation exists within the populations. The genetic identities in the three populations are very high (I=0.9172), and the genetic distances are verysmall (D=0.0876). The genetic distances are positively related to the spatial distances.

Key words: Erigeron breviscapus

摘要： 通过核型和等位酶分析,对短葶飞蓬(Erigeron breviscapus)种群遗传结构进行了较全面的研究.研究材料来自丽江、昆明、邱北.核型分析表明,这3个种群都为二倍体种群(2n=2x=18),以丽江种群为例,短葶飞蓬核型为2n=2x=18=6m+10sm(2SAT)+2st.10种酶的等位酶分析表明,短葶飞蓬的遗传变异存在于种群内.种群间遗传一致度高(I＝0.9172),遗传距离小(D=0.0876).遗传距离与空间距离大致成正相关.

关键词: 短葶飞蓬, 核型, 等位酶, 种群遗传结构