Systematic position of the enigmatic genus Sheareria (Asteraceae)-evidence from molecular, morphological and cytological data

	Systematic position of the enigmatic genus Sheareria (Asteraceae)-evidence from molecular, morphological and cytological data
	Gao, Tian-Gang 1; Wang, Wei1 ; Bayer, Randall J.2; Li, De-Zhu3
	2009-08-01
发表期刊	TAXON
卷号	58 期号:3 页码:769-780
摘要	The systematic position of the monoecious rheophyte, Sheareria (Asteraceae), a genus endemic to China, has been long disputed and never rigorously examined. In this study, two molecular datasets (trnL-F, ITS), Plus morphological and cytological characters, were used to assess the systematic position of Sheareria. The broader phylogenetic analyses based on the trnL-F data placed Sheareria in the tribe Astereae with strong support. This placement was also supported by the lanceolate style, "Asteroid type" ligule epidermis, yellow anthers, green achenes, and basic chromosome number of x = 9. Analysis of the tribe Astereae based oil the ITS dataset showed that Sheareria and three East Asian genera (Kalimeris, Aster, Rhynchospermum) formed a strongly Supported clade characterized by flat, 2-ribbed, glandular disc achenes. Detailed morphological comparisons indicate that Sheareria is more similar to Kalimeris than to Rhynchospermum. Within this clade, Sheareria is distinguished from other genera by its monoecious breeding system (vs. gynomonoecious). Based on fossil and geological evidence, the development of monoecy in Sheareria is discussed. Within Sheareria, only one species, S. nana, is recognized; S. leshanensis, a newly described species, is placed in synonymy.
关键词	Astereae Cytology Molecular Phylogeny Morphology Sheareria
学科领域	Plant Sciences ; Evolutionary Biology
收录类别	SCI
语种	英语
WOS记录号	WOS:000269774900007
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/14103
专题	中国西南野生生物种质资源库
作者单位	1.Chinese Acad Sci, Inst Bot, State Ke Lab Systemat & Evolutionary Bot, Beijing 100093, Peoples R China 2.Univ Memphis, Dept Biol, Memphis, TN 38152 USA 3.Chinese Acad Sci, Kunming Inst Bot, Kunming 650204, Peoples R China
推荐引用方式 GB/T 7714	Gao, Tian-Gang,Wang, Wei,Bayer, Randall J.,et al. Systematic position of the enigmatic genus Sheareria (Asteraceae)-evidence from molecular, morphological and cytological data[J]. TAXON,2009,58(3):769-780.
APA	Gao, Tian-Gang,Wang, Wei,Bayer, Randall J.,&Li, De-Zhu.(2009).Systematic position of the enigmatic genus Sheareria (Asteraceae)-evidence from molecular, morphological and cytological data.TAXON,58(3),769-780.
MLA	Gao, Tian-Gang,et al."Systematic position of the enigmatic genus Sheareria (Asteraceae)-evidence from molecular, morphological and cytological data".TAXON 58.3(2009):769-780.

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