星叶草属的核形态及其系统位置  

KARYOMORPHOLOGY AND RELATIONSHIPS OF THE GENUS CIRCAEASTER MAXIM.

作　　者：孔宏智[1] 杨亲二[1] 

机构地区：[1]中国科学院植物研究所系统与进化植物学开放研究实验室,北京100093

出　　处：《植物分类学报》1997年第6期494-499,共6页Acta Phytotaxonomica Sinica

基　　金：This work was supported by the National Natural Science Foundation of China(39630030);the Key Project Grants of Natural Resources and Environment of the Chinese Academy of Sciences.

摘　　要：本文研究了星叶草属的核形态。其间期核和前期染色体分别为简单染色中心型和中间型;中期染色体较小,长度介于 3.00μm到1.20μpm之间;核型公式为2n=30=22m+8sm。其明显很高的染色体基数以及其它退化和特化的形态学性状,表明该属是一个孑遗的古多倍体类群。该属与独叶草属在间期核形态、前期染色体形态以及中期染色体的大小和形态方面极为相似。结合其它方面的资料,本文认为星叶草属和独叶草属有较近的亲缘关系,支持将它们一起置于星叶草科的观点。Investigated in this paper was the karyomorphology of the monotypic genus Cir-caeaster Maxim. The interphase nuclei and the prophase chromosomes were categorized to be simple chromocenter type and interstitial type respectively; the metaphase chromosomes were rather small, ranging from 3.00 f33m to 1.20 f33m in length. The karyotype was formulated as 2n= 30 = 22m + 8sm. Its distinctive higher haploid chromosome number, together with its several highly reduced and specialized character states in morphology, suggests that Cir-caeaster is a relictual paleopolyploid group. The similar karyomorphological characteristics of interphase nuclei and prophase chromosomes between Circaeaster and Kingdonia, as well as the similar size and morphology of their metaphase chromosomes, support the viewpoint that they are closely related and are probably best treated as a ditypic family.

关 键 词：星叶草属 核形态 系统位置 

分 类 号：Q949.409[生物学—植物学]