合轴荚蒾和木绣球的核型分析

<正>忍冬科(Caprifoliaccae)的荚莲属(Viburnum)全世界约有200种,分布于亚洲、欧洲、南美、北美洲和北非。我国约有75种,南北均产之。属内以具放射状大型不孕花的种类最为美丽,供庭园观赏用。木绣球(V·macrocephalum)就是其中之一,分布于江苏、浙江、安徽、江西、湖南、湖北等省;合轴荚莲(V·sympodiale)分布于华东、华南、华中、西北和西南。

KARYOTYPE ANALYSES FOR VIBURNUM MACROCEPHALUM AND V. SYMPODIALE

Materials for karyotype analyses for Viburnum macrocephalum and V. sympodiale Graebn. are cultivated in Agricultural Academy of Jiangxi province and Huangshan of Anhui province. The numbers of chromosomes in growing-tip and root-tip cells of these two species are both 2n = 18, agreeing with those reported by Egolf. A comparison of the karyotypical data is shown in tables 1 and 2. According to the chromosomal terminology defined by Levan et al., the karyotypes formula of Viburnum sympodiale and V. macrocephalum is K(2n) =18 = 16m 2sm. They both belong to "2B" type of Stebbins' karyotypic asymmetry. But there are differences in ranges of ratio arm and length in V. macrocephalum and V. sympodiale, it is assumed that V. macrocephalum karyotype is a little more advanced than that of V. sympodiale. Photomicrographs, karyotypes and idiograms of V. sympodiale and 7. macrocephalum are shown in Figs. 1, 2, and 3.