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

Abstract 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 spec...

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Autores principales:	Wei Zheng, Li-Jun Yan, Kevin S. Burgess, Ya-Huang Luo, Jia-Yun Zou, Han-Tao Qin, Ji-Hua Wang, Lian-Ming Gao
Formato:	article
Lenguaje:	EN
Publicado:	BMC 2021
Materias:	ddRAD sequencing Hybrid zone Morphological trait Genetic structure Natural hybridization Rhododendron Botany QK1-989
Acceso en línea:	https://doaj.org/article/842d6e33b2454b419afb5ee31e303f65
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spelling	oai:doaj.org-article:842d6e33b2454b419afb5ee31e303f652021-11-14T12:09:12ZNatural hybridization among three Rhododendron species (Ericaceae) revealed by morphological and genomic evidence10.1186/s12870-021-03312-y1471-2229https://doaj.org/article/842d6e33b2454b419afb5ee31e303f652021-11-01T00:00:00Zhttps://doi.org/10.1186/s12870-021-03312-yhttps://doaj.org/toc/1471-2229Abstract 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. ×duclouxii) comprise multiple hybrid classes and a high proportion of F1 generation hybrids, while a novel hybrid taxon between R. spinuliferum and R. scabrifolium dominated the F2 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.Wei ZhengLi-Jun YanKevin S. BurgessYa-Huang LuoJia-Yun ZouHan-Tao QinJi-Hua WangLian-Ming GaoBMCarticleddRAD sequencingHybrid zoneMorphological traitGenetic structureNatural hybridizationRhododendronBotanyQK1-989ENBMC Plant Biology, Vol 21, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ddRAD sequencing Hybrid zone Morphological trait Genetic structure Natural hybridization Rhododendron Botany QK1-989
spellingShingle	ddRAD sequencing Hybrid zone Morphological trait Genetic structure Natural hybridization Rhododendron Botany QK1-989 Wei Zheng Li-Jun Yan Kevin S. Burgess Ya-Huang Luo Jia-Yun Zou Han-Tao Qin Ji-Hua Wang Lian-Ming Gao Natural hybridization among three Rhododendron species (Ericaceae) revealed by morphological and genomic evidence
description	Abstract 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. ×duclouxii) comprise multiple hybrid classes and a high proportion of F1 generation hybrids, while a novel hybrid taxon between R. spinuliferum and R. scabrifolium dominated the F2 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.
format	article
author	Wei Zheng Li-Jun Yan Kevin S. Burgess Ya-Huang Luo Jia-Yun Zou Han-Tao Qin Ji-Hua Wang Lian-Ming Gao
author_facet	Wei Zheng Li-Jun Yan Kevin S. Burgess Ya-Huang Luo Jia-Yun Zou Han-Tao Qin Ji-Hua Wang Lian-Ming Gao
author_sort	Wei Zheng
title	Natural hybridization among three Rhododendron species (Ericaceae) revealed by morphological and genomic evidence
title_short	Natural hybridization among three Rhododendron species (Ericaceae) revealed by morphological and genomic evidence
title_full	Natural hybridization among three Rhododendron species (Ericaceae) revealed by morphological and genomic evidence
title_fullStr	Natural hybridization among three Rhododendron species (Ericaceae) revealed by morphological and genomic evidence
title_full_unstemmed	Natural hybridization among three Rhododendron species (Ericaceae) revealed by morphological and genomic evidence
title_sort	natural hybridization among three rhododendron species (ericaceae) revealed by morphological and genomic evidence
publisher	BMC
publishDate	2021
url	https://doaj.org/article/842d6e33b2454b419afb5ee31e303f65
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Natural hybridization among three Rhododendron species (Ericaceae) revealed by morphological and genomic evidence

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