中国特有属植物长蕊斑种草（紫草科）的核型

Karyotype of Antiotrema dunnianum (Boraginaceae)， a species endemic to China

关键词:  长蕊斑种草  紫草科  同源染色体异型  核型  分类

Key words:  Antiotrema dunnianum  Boraginaceae  allotype of homologous chromosome  karyotype  classificaion

摘要:

长蕊斑种草为我国西南特有单型属植物。对其种子根尖细胞染色体进行了观察。其染色体数目为24，核型为2n=24=16m+6sm+2T。其中第一对同源染色体异型。通过紫草科已有的细胞学资料认为该属放在琉璃草族比紫草族更合理。

Abstract:

Antiotrema dunnianum，a species of the family Boraginaceae and endemic to China，was karyo morphologically studied for the first time. Its chromosome number is 24 and its karyotype is formulated as 2n=24=16m+6sm+2T. It is worthy to notice that the two chromosomes of its first pair of homologue are different in length and arm ratio. By comparing with the cytological data published of Boraginaceae，it is supported that this species is included in Cynoglosseae but not Lithospermeae.