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- Title
Systematic significance of cytology in Cyananthus (Campanulaceae) endemic to the Sino-Himalayan region.
- Authors
CHEN, Guang‐Fu; SUN, Wen‐Guang; HONG, De‐Yuan; ZHOU, Zhuo; NIU, Yang; NIE, Ze‐Long; SUN, Hang; ZHANG, Jian‐Wen; LI, Zhi‐Min
- Abstract
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 2 n = 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.
- Subjects
HENGDUAN Mountains (China); CAMPANULACEAE; PLOIDY; TETRAPLOIDY; CLUSTER analysis (Statistics); PLANT chromosomes
- Publication
Journal of Systematics & Evolution, 2014, Vol 52, Issue 3, p260
- ISSN
1674-4918
- Publication type
Article
- DOI
10.1111/jse.12095