期刊
JOURNAL OF SYSTEMATICS AND EVOLUTION
卷 52, 期 3, 页码 260-270出版社
WILEY
DOI: 10.1111/jse.12095
关键词
aneuploidy and polyploidy; chromosomes; cluster analysis; Cyananthus; evolution; Himalayan-Hengduan Mountains
资金
- Key Program of Basic Work Special Plan of the Ministry of Science and Technology of China [2007FY110100]
- National Natural Science Foundation of China - Yunnan Natural Science Foundation Union Project [U1136601]
- National Natural Science Foundation of China [31360049]
- Yunnan Provincial Excellent Course Botany Program
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.
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