Does reproductive isolation reflect the segregation of color forms in Spiranthes sinensis (Pers.) Ames complex (Orchidaceae) in the Chinese Himalayas?
Tao, Zhi-Bin1,2; Ren, Zong-Xin1; Bernhardt, Peter3; Liang, Huan1,2; Li, Hai-Dong1; Zhao, Yan-Hui1; Wang, Hong1; Li, De-Zhu4
2018-06-01
发表期刊ECOLOGY AND EVOLUTION
ISSN2045-7758
卷号8期号:11页码:5455-5469
摘要Isolation between species, or taxa sharing a common lineage, depends primarily on the relative strengths of various reproductive barriers. Previous studies on reproductive isolation between orchids emphasized mechanical and ethological barriers in flowers of species showing food and/or sexual mimicry. In this study, we investigated and quantified a series of prepollination and postpollination barriers between pink and white forms of Spiranthes sinensis sl, a nectar-secreting complex. We generated ML trees based on trnS-G and matK to explore phylogenetic relationships in this species complex. Spiranthes sinensis sl segregated from some other congeners, but the white form constituted a distinct clade in relation to the pink form. The white form secreted 2-Phenylethanol as it is a single-scent compound and was pollinated almost exclusively by native, large-bodied Apis cerana and Bombus species (Apidae). Apis cerana showed a high floral constancy to this form. The scentless, pink form was pollinated primarily by smaller bees in the genera Ceratina (Apidae), and members of the family Halictidae, with infrequent visits by A.cerana and Bombus species. Fruit set and the production of large embryos following interform pollination treatments were significantly lower compared to intraform pollination results for the white form. Our results suggested that pollinator isolation, based on color and scent cues, may result in greater floral constancy in white populations when both forms are sympatric as two different, guilds of pollinators forage selectively preventing or reducing prospective gene flow. Postpollination barriers appear weaker than prepollination barriers but they also play a role in interform isolation, especially in the white form. Our findings suggest that floral color forms in S.sinensis do not represent an unbalanced polymorphism. Interpretations of the evolutionary status of these forms are discussed.
关键词Bee Pollinators Floral Color Floral Scent Phylogenetics Reproductive Isolation Spiranthes Sinensis
DOI10.1002/ece3.4067
语种英语
WOS记录号WOS:000435776600022
引用统计
文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/61412
专题中国科学院东亚植物多样性与生物地理学重点实验室
作者单位1.Chinese Acad Sci, Key Lab Plant Divers & Biogeog East Asia, Kunming Inst Bot, Kunming, Yunnan, Peoples R China
2.Univ Chinese Acad Sci, Kunming Coll Life Sci, Kunming, Yunnan, Peoples R China
3.St Louis Univ, Dept Biol, St Louis, MO 63103 USA
4.Chinese Acad Sci, Germplasm Bank Wild Species, Kunming Inst Bot, Kunming, Yunnan, Peoples R China
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Tao, Zhi-Bin,Ren, Zong-Xin,Bernhardt, Peter,et al. Does reproductive isolation reflect the segregation of color forms in Spiranthes sinensis (Pers.) Ames complex (Orchidaceae) in the Chinese Himalayas?[J]. ECOLOGY AND EVOLUTION,2018,8(11):5455-5469.
APA Tao, Zhi-Bin.,Ren, Zong-Xin.,Bernhardt, Peter.,Liang, Huan.,Li, Hai-Dong.,...&Li, De-Zhu.(2018).Does reproductive isolation reflect the segregation of color forms in Spiranthes sinensis (Pers.) Ames complex (Orchidaceae) in the Chinese Himalayas?.ECOLOGY AND EVOLUTION,8(11),5455-5469.
MLA Tao, Zhi-Bin,et al."Does reproductive isolation reflect the segregation of color forms in Spiranthes sinensis (Pers.) Ames complex (Orchidaceae) in the Chinese Himalayas?".ECOLOGY AND EVOLUTION 8.11(2018):5455-5469.
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