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Chromosome counts and karyotypes in Chaetoseris and Stenoseris (Asteraceae‐Cichorieae) from the Hengduan Mountains of SW China
Author(s) -
DENG Tao,
MENG Ying,
SUN Hang,
NIE ZeLong
Publication year - 2011
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/j.1759-6831.2011.00114.x
Subject(s) - karyotype , biology , asteraceae , ploidy , chromosome , tribe , botany , taxon , genetic algorithm , zoology , evolutionary biology , genetics , gene , sociology , anthropology
Abstract Chaetoseris and Stenoseris are two morphologically close genera from the tribe Cichorieae of the sunflower family and they are endemic in alpine eastern Himalayas to the Hengduan Mountains of SW China. Mitotic chromosome numbers and karyotypes are reported for 12 populations representing eight species of Chaetoseris and two species of Stenoseris from the Hengduan Mountains region. Eight species are new and the other two provide confirmation of previous reference. All Chaetoseris and Stenoseris taxa are diploidy with 2 n = 16 and their basic number is tentatively suggested as x = 8. Karyotypes of Chaetoseris and Stenoseris are similar to each other with 2A and 2B for the former and 2A for the latter. Cytological data of chromosomal numbers and karyotypes support a close relationship of the two genera. Currently no polyploids are found for these two genera and it seems that polyploidization has played a minor role in their evolutionary speciation in the Hengduan Mountains region.