Systematic significance of cytology in Cyananthus (Campanulaceae) endemic to the Sino-Himalayan region

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 basi...

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Published in:Journal of systematics and evolution : JSE 2014-05, Vol.52 (3), p.260-270
Main 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
Format: Article
Language:English
Subjects:
analysis
Cyananthus
evolution
Himalayan-Hengduan
and
aneuploidy
aneuploidy and polyploidy
Campanulaceae
chromosome number
Chromosomes
cluster analysis
Cyananthus
evolution
Himalayan-Hengduan Mountains
Mountains
polyploidy
chromosomes
cluster
tetraploidy
Turfgrasses
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Summary: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.
ISSN:1674-4918
1759-6831
DOI:10.1111/jse.12095