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Systematic position of the enigmatic genus Sheareria (Asteraceae)-evidence from molecular, morphological and cytological data
Gao, Tian-Gang1; Wang, Wei1; Bayer, Randall J.2; Li, De-Zhu3
2009-08-01
Source PublicationTAXON
Volume58Issue:3Pages:769-780
AbstractThe 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.
KeywordAstereae Cytology Molecular Phylogeny Morphology Sheareria
Subject AreaPlant Sciences ; Evolutionary Biology
Indexed BySCI
Language英语
WOS Research AreaPlant Sciences ; Evolutionary Biology
WOS SubjectPlant Sciences ; Evolutionary Biology
WOS IDWOS:000269774900007
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/14103
Collection中国西南野生生物种质资源库
Affiliation1.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
Recommended Citation
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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