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Systematic significance of cytology in Cyananthus (Campanulaceae) endemic to the Sino‐Himalayan region
Author(s) -
CHEN GuangFu,
SUN WenGuang,
HONG DeYuan,
ZHOU Zhuo,
NIU Yang,
NIE ZeLong,
SUN Hang,
ZHANG JianWen,
LI ZhiMin
Publication year - 2014
Publication title -
journal of systematics and evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.249
H-Index - 46
eISSN - 1759-6831
pISSN - 1674-4918
DOI - 10.1111/jse.12095
Subject(s) - campanulaceae , genus , biology , taxon , ploidy , chromosome , evolutionary biology , chromosome number , zoology , botany , karyotype , genetics , gene
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.