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题名: Chromosome study of the fern genus Cyrtomium (Dryopteridaceae)
作者: Lu, JM; Cheng, X; Wu, D; null(李德铢)
刊名: BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
关键词: apogamy ; Balansana ; polyploidy
英文摘要: Cyrtomium (Dryopteridaceae) is an Asiatic genus comprising about 40 species characterized by having anastomosing veins that form areolae with included veinlets. Twelve chromosome counts representing 11 taxa were made in the present study. The chromosome numbers of six species endemic to China are reported for the first time: C. uniseriale, 2n = 164; C. guizhouense, 2n = 82; C. shingianum, n = 82, 2n = c.164; C. chingianum, 2n = 164; C. urophyllum, 2n = 82 and C. aequibasis, 2n = 123. The results were used to show that (1) C. uniseriale should be reduced to varietal status under C. balansae; (2) subseries Balansana is not closely related to any other Cyrtomium species and should be separated from Cyrtomium; and (3) C. guizhouense and C. lonchitoides are basal groups when subseries Balansana is not considered. These results were also supported by morphology. A high level of differentiation is a distinct characteristic in Cyrtomium. The genus has two reproductive types: sexual and apogamous. Sexual species are distributed mostly in China. Southwestern China is a modern diversity centre of Cyrtomium, with 80.6% of known species occurring there. Many species are endemic, most of which are sexual tetraploids or apogamous triploids. Both the apogamous reproductive type and polyploid species are adaptions to limestone habitats. (c) 2006 The Linnean Society of London.
出版日期: 2006-02-01
卷号: 150, 期号:2, 页码:221-228
语种: 英语
收录类别: SCI
学科分类: Plant Sciences
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/11207
Appears in Collections:中国西南野生生物种质资源库_期刊论文

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作者单位: 1.Chinese Acad Sci, Kunming Inst Bot, Lab Plant Biogeog & Biodivers, Kunming 650204, Yunnan, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Lu, JM; Cheng, X; Wu, D; Li, DZ.Chromosome study of the fern genus Cyrtomium (Dryopteridaceae),BOTANICAL JOURNAL OF THE LINNEAN SOCIETY,2006,150(2):221-228
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