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题名: Polyploidy in the flora of the Hengduan Mountains hotspot, southwestern China
作者: null(聂泽龙); Wen, J; Gu, ZJ; Boufford, DE; Sun Hang(孙航)
刊名: ANNALS OF THE MISSOURI BOTANICAL GARDEN
关键词: chromosome number ; diversification ; Hengduan Mountains ; Hotspot ; polyploidy
英文摘要: The Hengduan Mountain region is located at the eastern end of the Himalayan range and in the southeastern corner of the Qinghai-Tibet Plateau in eastern Asia. It is probably the richest temperate region in the world biologically, with about 8000 species recorded from the 500,000 km(2) region. A high rate of polyploidy was expected in the Hengduan Mountains because of the unusually high species diversity and endemism, the widespread alpine environment in this region, and the importance of polyploidy in plant evolution. Chromosome numbers for 552 taxa of native Hengduan angiosperms were obtained from published literature. If the criterion of infrageneric polyploidy is used (i.e., the possession of three or more basic chromosome sets in a nucleus), the frequency of polyploidy is only 22%. It is 37% and 58% if taxa with haploid chromosome number n = 14 or more, or n I I or more are considered to be polyploids, respectively. Several highly diversified groups such as Aconitum and Delphinium also show a low proportion of polyploidy (18.6% and 0%, respectively) in The Hengduan Mountains. Examples from other large plant groups (e.g., Saxifraga, Ligularia, and Cremanthodium) and endemic genera (e.g., Solms-laubachia, Tibetia, and Nomocharis) again indicated that polyploidy, especially infrageneric polyploidy, may have played a minor role in the evolutionary diversification of these plants in the Hengduan Mountains.
出版日期: 2005
卷号: 92, 期号:2, 页码:275-306
语种: 英语
收录类别: SCI
学科分类: Plant Sciences
ISSN号: 0026-6493
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/2795
Appears in Collections:中国科学院东亚植物多样性与生物地理学重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650204, Yunnan, Peoples R China
2.Field Museum Nat Hist, Dept Bot, Chicago, IL 60605 USA
3.Chinese Acad Sci, Inst Bot, Lab Systemat & Evolutionary, Beijing 100093, Peoples R China
4.Harvard Univ Hebaria, Cambridge, MA 02138 USA

Recommended Citation:
Nie, ZL; Wen, J; Gu, ZJ; Boufford, DE; Sun, H.Polyploidy in the flora of the Hengduan Mountains hotspot, southwestern China,ANNALS OF THE MISSOURI BOTANICAL GARDEN,2005,92(2):275-306
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