鸡爪草属的染色体及其系统位置

本文研究了毛茛科鸡爪草Calathodes oxycarpa的核形态。其静止核和有丝分裂前期染色体分别属于复杂中央染色微粒型和中间型,中期染色体属于R型,核型公式为2n=16=8sm 8st(2sat)。据此并结合有关资料,讨论了鸡爪草属与毛茛科其它类群的亲缘关系,认为鸡爪草属与金莲花属和特产于南朝鲜的Megaleranthis属是极为近缘的类群,不宜将它们分开置于不同的族或亚科中。

ON THE CHROMOSOMES OF CALATHODES (RANUNCULACEAE) AND ITS SYSTEMATIC POSITION

Investigated in this paper was the karyomorphology of Calathodes oxycarpa (Ra-nunculaceae). The resting nuclei and the prophase chromosomes were categorized to be complex chromocenter type and interstitial type respectively; the metaphase chromosomes were relatively large and belonged to Ranunculus-type (R type); the karyotype was formulated as 2n = 16 = 8sm 8st (2sat). Based on the results, combined with the evidence from comparative morphology and palynology, the genus Calathodes is considered to be most closely related to Trollius and Megaleranthis. It is not reasonable to put them in different tribes or subfamilies.