【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。更多还原

【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 formula of 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.更多还原