Molecular evidence for asymmetric hybridization in three closely related sympatric species
Zhang, Ning-Ning1,2,3; Yu, Jiao-Jun2; Wang, Yue-Hua1; Gong, Xun2
2018-02-01
Source PublicationAOB PLANTS
ISSN2041-2851
Volume10Issue:1Pages:ply011
Abstract

Natural hybridization is common in plants and results in different evolutionary consequences to hybridizing species. Pre- and post-zygotic reproductive isolating barriers can impede hybridization between closely related species to maintain their species integrity. In Northwest Yunnan, three Ligularia species (Ligularia cyathiceps, L. duciformis and L. yunnanensis) and four types of morphologically intermediate individuals were discovered growing together in an area subject to human disturbance. In this study, we used three low-copy nuclear loci to test the natural hybridization hypothesis and the hybridization direction was ascertained by three chloroplast DNA fragments. The results indicated there were two hybridization groups at the study site, L. cyathiceps x L. duciformis and L. duciformis x L. yunnanensis, and two types of morphologically intermediate individuals were produced by L. cyathiceps and L. duciformis, and another two types were produced by L. duciformis and L. yunnanensis, while no hybrids between L. cyathiceps and L. yunnanensis were observed. Both hybridizing groups showed bidirectional but asymmetric hybridization and the factors influencing the symmetry are discussed. Most hybrids produced by the two hybridization groups seemed to be F-1 generation. Hybrids with different morphologies within the same hybridization group showed similar genetic components. The results suggest that although human disturbance may promote natural hybridization among the three Ligularia species bringing them together, hybrids are limited to F(1)s and therefore species boundaries might be maintained.

KeywordAsymmetric Hybridization Chloroplast Dna F-1 Generation Ligularia Nuclear Loci Two Hybridization Groups
DOI10.1093/aobpla/ply011
WOS IDWOS:000427226900026
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Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/60441
Collection植物化学与西部植物资源持续利用国家重点实验室
Affiliation1.Yunnan Univ, Sch Life Sci, Plant Sci Inst, Kunming 650201, Yunnan, Peoples R China
2.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Div & Biogeog East Asia, Kunming 650201, Yunnan, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Ning-Ning,Yu, Jiao-Jun,Wang, Yue-Hua,et al. Molecular evidence for asymmetric hybridization in three closely related sympatric species[J]. AOB PLANTS,2018,10(1):ply011.
APA Zhang, Ning-Ning,Yu, Jiao-Jun,Wang, Yue-Hua,&Gong, Xun.(2018).Molecular evidence for asymmetric hybridization in three closely related sympatric species.AOB PLANTS,10(1),ply011.
MLA Zhang, Ning-Ning,et al."Molecular evidence for asymmetric hybridization in three closely related sympatric species".AOB PLANTS 10.1(2018):ply011.
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