菊科紫菀属横斜系的核型研究
A Karyotypic Study on Aster Series Hersileoides Ling(Asteraceae)
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摘要: 菊科紫菀属横斜系(Asterseries Hersileoides Ling)特产于中国,含横斜紫菀(Aster hersileoides Schneid.)和亮叶紫菀(A.nitidus Chang)2个狭域分布种。细胞学研究表明,横斜紫菀和亮叶紫菀均为二倍体,染色体较小,长度在1.64～2.8μm之间,核型公式为2n=2x=18=16m+2sm,属1A类型。横斜紫菀和亮叶紫菀的染色体数目和核型为首次报道。Abstract: Aster ser.Hersileoides Ling(Aster,Asteraceae) endemic to western China consists of only two geographically restricted species,Aster hersileoides Schneid and Aster nitidus Chang.The mitotic chromosome numbers and the karyotypes of the two species were investigated for the first time.The results showed that both species were diploids with small chromosomes ranging from 1.64μm to 2.8μm and that their karyotypes were formulated as 2n=2x=18=16m+2sm,belonging to 1A type.
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