中国含笑属核型分析

对我国木兰科Magnoliaceae含笑属Michelia 12个种的核型进行了研究，核型公式如下:火力楠 M．macclurei var．sublanea 2n=34m(2SAT)+4sm；白兰M．alba 2n=34m+4sm；多花含笑M.flori- bunda 2n=30m+8sm；黄兰M.champaca 2n=32m+6sm；石碌含笑M.shiluensis 2n=32m+6sm；阔 瓣含笑M . platypetala 2n=32m+6sm(2SAT)；含笑M．figo 2n=32m+6sm；深山含笑M．maudiae 2n=32m+6sm；长蕊含笑M. longistamina 2n=32m=6sm；金叶含笑M.foveolata 2n=34m=4sm； 野含笑M.skineriana 2n=30m+8sm；峨嵋含笑M.wilsonii 2n=30m+8sm(2SAT)。该属核型全部为 对称核型，除多花含笑为1A类型外，其他均为2A核型。含笑属种间核型具有很大相似性，核型资料对该属属以下的分类帮助不大。

THE KARYOTYPE ANALYSIS OF MICHELIA (MAGNOLIACEAE) IN CHINA

Karyotypes of 12 species of Michelia in the Magnoliaceae were studied. Their karyotype formulas are: M. macclurei var. sublanea 2n=34m(2SAT) 4sm; M. alba 2n=34m 4sm; M. floribunda 2n=30m 8sm; M. champaca 2n=32m 6sm; M. shiluensis 2n=32m 6sm; M. platypetala 2n=32m 6sm(2SAT); M. figo 2n=32m 6sm; M. maudiae 2n=32m 6sm; M. longistamina 2n=32m 6sm; M. foveolata 2n=34m 4sm;M. skineriana 2n=30m 8sm;M. wilsonii 2n=30m 8sm(2SAT). All the species are of the symmetrical karyotype. The karyotypes all belong to 2A type except that of M. floribunda which is of 1A type. Due to the karyotype similarity among species, the karyotype data in Michelia may be hardly useful for infrageneric taxonomy.