Systematic significance of cytology in Cyananthus ( Campanulaceae) endemic to the Sino-Himalayan region
Systematic significance of cytology in Cyananthus ( Campanulaceae) endemic to the Sino-Himalayan region
复制标题
中国-喜马拉雅地区特有的桔梗科植物细胞学的系统意义
DOI：
10.1111/jse.12095
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发表时间：
2014-05-01
影响因子：
3.7
通讯作者：
Li, Zhi-Min
中科院分区：
文献类型：
--
作者：
Chen, Guang-Fu;Sun, Wen-Guang;Li, Zhi-Min
应用核型和数值分类学技术，对中国-喜马拉雅山特有属蓝花属（桔梗科）15种24个居群的染色体数目和形态进行了研究。这些类群的染色体数目为2n=10，12，14，24，28，属的基本染色体数目为x=5，6，7。除C.肿钩F. & Thoms.和C.小叶藓首次对该属植物进行了倍性鉴定，并报道了一个新的倍性水平（四倍体）。染色体测量数据进行聚类分析。根据细胞核学资料，讨论了蓝花属内三个组之间的关系和该属内的进化趋势。细胞学资料表明，蓝花属是桔梗科中相对原始的一个属，属内存在明显的分化，多倍化可能在喜马拉雅-横断山区蓝花属的染色体进化和物种形成中起重要作用。
Chromosome numbers and the morphology of members of 24 populations representing 15 species of the Sino-Himalayan endemic genus Cyananthus (Campanulaceae) were studied using karyological and numerical taxonomic techniques. The chromosome numbers of these taxa are 2n=10, 12, 14, 24, 28, and the basic chromosome numbers for the genus are x=5, 6, 7. All species except C. inflatus Hook. f. & Thoms. and C. microphyllus Edgew. were examined for the first time and a new ploidy level (tetraploidy) is reported in the genus. Chromosome measurement data were analyzed using cluster analysis. The relationships between three sections within Cyananthus and evolutionary trends within the genus are discussed in the light of karyological data. The cytological data suggest that Cyananthus is a relatively primitive genus in Campanulaceae and there is significant division within the genus, and polyploidization may have played an important role in the chromosome evolution and speciation of Cyananthus in the Himalayan-Hengduan Mountains.