Karyomorphology of Onagraceae and its Systematic Implications

橙花科间期核型可分为四类：单染核型、原染色体型、复合型和弥漫型(Tanaka et al.，1988)。本研究对萝卜科9属25种植物的间期核进行了形态观察和2CDNA含量测定，以探讨它们之间的相互关系和系统学意义。除弥漫型外，其余三种类型的2C DNA含量在3.58pg-0.52pg之间呈连续变化。因此，三种核形态的间期不能用2CDNA含量来区分，而弥漫型的2CDNA含量要多。将2C DNA含量与已报道的基于形态和分子数据的系统发育树进行比较，可以清楚地看出，属间分化是通过增加2C DNA含量进行的，而属下分化是通过降低2C DNA含量进行的。

Types of interphase nucleus of Onagraceae are categorized to four groups : Simple chromocenter type, prochromosome type, complex chromocenter type and diffuse type (Tanaka et al., 1988). in this study, we observed morphology of interphase nucleus and measured 2C DNA contents of 25 species of nine genera in Onagraceae for examination of their mutual relationships and systematic implications. Except the diffuse type, 2C DNA contents of the rest of three types show continuous variation between 3.58pg-0.52pg. Thus, the three karyomorphological types of interphase can not be divided each other by 2C DNA contents.However, 2C DNA contents of the diffuse type are more than. 7.00pg, thus, the diffuse type can be clearly distingushed from other three types.Compared 2C DNA contents with phylogenetic tree based on analyzes of morphological and molecular data reported, it might be clear that intergeneric differentiation is carried out by increasing of 2C DNA contents, however, infrageneric differentiation is carried out by decreasing of 2C DNA contents.