Abstract:

The chromosomes number and karyotypes for an important medicinal plant , Erigeron breviscapus ( Vant. ) Hand. -Mazz. , in wild populations from Yunnan were reported in this paper. Two kind of ploidy levels were observed within two populations of the species. (1) Cangshan population: the karyotype formula of the diploid type is 2n = 2x = 18 = 4m+ 10sm+ 4st and 2n = 3x = 27 = 6m + 12sm+ 9st for triploid, (2 ) Yangjiaping population: the karyotype formulaof the diploid type is 2n = 2x= 18 = 6m + 10sm+ 2st and 2n = 3x= 27 = 3m+15sm+9st for triploid. The triploid type of E. breviscapus was discovered for the first time. Morphological characteristics of the triploid individuals suggest that E. breviscapus has a potential for fostering a better breed .

Key words: Erigeron breviscapus

摘要： 对云南省野生居群的短葶飞蓬有丝分裂的细胞学特征进行观察研究。在云南省大理苍山、腾冲杨家坪的二倍体野生居群中, 发现有三倍体个体的存在。苍山居群的两种核型分别为2n = 2x = 18 = 4m + 10sm +4st, 2n = 3x= 27 = 6m+12sm+ 9st ; 杨家坪居群的两种核型分别为2n = 2x = 18 = 6m + 10sm + 2st , 2n = 3x = 27= 3m+ 15sm + 9st。通过对其生物学特性及表型的分析, 认为短葶飞蓬可以采取多倍体育种方式获得更优良的品种。

关键词: 核型, 三倍体, 育种FONTP