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

Autor:	Zhuo Zhou, Guang‐Fu Chen, Jian-Wen Zhang, Hang Sun, De-Yuan Hong, Zhi-Min Li, Wen-Guang Sun, Ze-Long Nie, Yang Niu
Rok vydání:	2014
Předmět:	Campanulaceae Taxon biology Genus Zoology Chromosome Cyananthus Morphology (biology) Plant Science Ploidy biology.organism_classification Ecology Evolution Behavior and Systematics
Zdroj:	Journal of Systematics and Evolution. 52:260-270
ISSN:	1674-4918
DOI:	10.1111/jse.12095
Popis:	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.
Databáze:	OpenAIRE
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