Natural hybridization among three Rhododendron species (Ericaceae) revealed by morphological and genomic evidence

文献类型： 外文期刊

第一作者： Zheng, Wei

作者： Zheng, Wei;Yan, Li-Jun;Luo, Ya-Huang;Zou, Jia-Yun;Qin, Han-Tao;Gao, Lian-Ming;Zheng, Wei;Yan, Li-Jun;Zou, Jia-Yun;Qin, Han-Tao;Yan, Li-Jun;Burgess, Kevin S.;Wang, Ji-Hua;Gao, Lian-Ming

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关键词： ddRAD sequencing; Hybrid zone; Morphological trait; Genetic structure; Natural hybridization; Rhododendron

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）

ISSN： 1471-2229

年卷期： 2021 年 21 卷 1 期

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收录情况： SCI

摘要： Background Natural hybridization can influence the adaptive response to selection and accelerate species diversification. Understanding the composition and structure of hybrid zones may elucidate patterns of hybridization processes that are important to the formation and maintenance of species, especially for taxa that have experienced rapidly adaptive radiation. Here, we used morphological traits, ddRAD-seq and plastid DNA sequence data to investigate the structure of a Rhododendron hybrid zone and uncover the hybridization patterns among three sympatric and closely related species. Results Our results show that the hybrid zone is complex, where bi-directional hybridization takes place among the three sympatric parental species: R. spinuliferum, R. scabrifolium, and R. spiciferum. Hybrids between R. spinuliferum and R. spiciferum (R. xduclouxii) comprise multiple hybrid classes and a high proportion of F-1 generation hybrids, while a novel hybrid taxon between R. spinuliferum and R. scabrifolium dominated the F-2 generation, but no backcross individuals were detected. The hybrid zone showed basically coincident patterns of population structure between genomic and morphological data. Conclusions Natural hybridization exists among the three Rhododendron species in the hybrid zone, although patterns of hybrid formation vary between hybrid taxa, which may result in different evolutionary outcomes. This study represents a unique opportunity to dissect the ecological and evolutionary mechanisms associated with adaptive radiation of Rhododendron species in a biodiversity hotspot.

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