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Chromosome studies in the tribe Clauseneae and the cytological homogeneity in the orange subfamily (Aurantioideae, Rutaceae)
Author(s) -
MOU FengJuan,
ZHANG DianXiang
Publication year - 2012
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.1759-6831.2012.00193.x
Subject(s) - subfamily , biology , ploidy , tribe , murraya , rutaceae , chromosome , chromosome number , botany , karyotype , genetics , gene , sociology , anthropology
Chromosome numbers for 21 Rutaceous species, representing five genera ( Bergera , Clausena , Glycosmis , Micromelum , and Murraya ) in the tribe Clauseneae (Aurantioideae, Rutaceae) were investigated to shed light on the relationships between these genera in the tribe in particular, and with other groups in the orange subfamily in general. Most species have the chromosome number 2 n = 2 x = 18, but Glycosmis shows variable chromosome numbers with ploidy levels ranging from 2 x to 8 x . Glycosmis parviflora is hexaploid with a chromosome number of 2 n = 6 x = 54 and G. longipetala octoploid with 2 n = 8 x = 72, and diploid with 2 n = 2 x = 18 was observed in other species. One species ( Clausena excavata ) shows intraspecies ploidy variation. The chromosome numbers of 11 species, Bergera kwangsiensis , B. microphylla , Clausena dunniana , C. emarginata , C. lenis , C. yunnanensis , Glycosmis esquirolii , G. lucida , G. oligantha , Micromelum falctum , and Murraya alata , are reported for the first time. The basic chromosome number x = 9 was inferred for all species studied. These results, together with previous chromosome counts in the tribe Citreae, reveal a cytological homogeneity, and strongly support the monophyly of the orange subfamily.