Chromosome study of the fern genus Cyrtomium (Dryopteridaceae)

	Chromosome study of the fern genus Cyrtomium (Dryopteridaceae)
	Lu, JM; Cheng, X ; Wu, D ; Li, DZ
	2006-02-01
发表期刊	BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
卷号	150 期号:2 页码:221-228
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.
关键词	Apogamy Balansana Polyploidy
学科领域	Plant Sciences
收录类别	SCI
语种	英语
WOS记录号	WOS:000234919000007
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/11207
专题	中国西南野生生物种质资源库
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
推荐引用方式 GB/T 7714	Lu, JM,Cheng, X,Wu, D,et al. Chromosome study of the fern genus Cyrtomium (Dryopteridaceae)[J]. BOTANICAL JOURNAL OF THE LINNEAN SOCIETY,2006,150(2):221-228.
APA	Lu, JM,Cheng, X,Wu, D,&Li, DZ.(2006).Chromosome study of the fern genus Cyrtomium (Dryopteridaceae).BOTANICAL JOURNAL OF THE LINNEAN SOCIETY,150(2),221-228.
MLA	Lu, JM,et al."Chromosome study of the fern genus Cyrtomium (Dryopteridaceae)".BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 150.2(2006):221-228.

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