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An Empirical Analysis Rejects the Hybrid Speciation Hypothesis of a Crucial Kiwifruit Species, Despite Genomic Evidence of Frequent Interspecific Gene Flow in the Genus
Hybrid speciation is an important way to generate species diversity. In general, however, interspecific hybridization is easily confused with the formation of hybrid species. Using the genomic resequencing data of the kiwifruit genus (Actinidia), at least ten species were documented recently as homo...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Frontiers Media S.A.
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7011101/ https://www.ncbi.nlm.nih.gov/pubmed/32117405 http://dx.doi.org/10.3389/fgene.2019.01250 |
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author | Yang, Jie Fu, Weirui Xu, Haoming Song, Zhiping Zhang, Wenju Yang, Ji Wang, Yuguo |
author_facet | Yang, Jie Fu, Weirui Xu, Haoming Song, Zhiping Zhang, Wenju Yang, Ji Wang, Yuguo |
author_sort | Yang, Jie |
collection | PubMed |
description | Hybrid speciation is an important way to generate species diversity. In general, however, interspecific hybridization is easily confused with the formation of hybrid species. Using the genomic resequencing data of the kiwifruit genus (Actinidia), at least ten species were documented recently as homoploid hybrid species, and thus a two-layer mode of species diversification has been proposed. As a crucial piece of evidence, Actinidia fulvicoma was identified as a hybrid derivative of Actinidia eriantha × Actinidia cylindrica, representing a rare case of hybrid species in kiwifruit that won the competition of ecological niches with one of its putative parental species, A. cylindrica. However, the hypothesized hybrid origin of A. fulvicoma is inconsistent with our specimen observations. Here, we present multiple lines of evidence to reject the hybrid speciation hypothesis for this species, despite genomic evidence for frequent interspecific gene flow. We collected the samples of A. fulvicoma in type locality and neighboring regions to contrast them with type specimen, and sequenced nuclear ribosomal DNA ITS, chloroplast trnL-trnF and mitochondrial nad2-i3, as well as four single-copy nuclear genes explored from kiwifruit genomes, to infer phylogenetic relationships among A. fulvicoma, its putative parental species, and their relatives. Our data definitely reveal that A. fulvicoma occupies an independent backbone lineage and it is not a hybrid. This study suggests that correct evolutionary applications on extensive surveys of the putative hybrid and its possible parents with strict criteria are necessary in the documentation of hybrid speciation to advance our understanding of the genomic basis of hybrid species. |
format | Online Article Text |
id | pubmed-7011101 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-70111012020-02-28 An Empirical Analysis Rejects the Hybrid Speciation Hypothesis of a Crucial Kiwifruit Species, Despite Genomic Evidence of Frequent Interspecific Gene Flow in the Genus Yang, Jie Fu, Weirui Xu, Haoming Song, Zhiping Zhang, Wenju Yang, Ji Wang, Yuguo Front Genet Genetics Hybrid speciation is an important way to generate species diversity. In general, however, interspecific hybridization is easily confused with the formation of hybrid species. Using the genomic resequencing data of the kiwifruit genus (Actinidia), at least ten species were documented recently as homoploid hybrid species, and thus a two-layer mode of species diversification has been proposed. As a crucial piece of evidence, Actinidia fulvicoma was identified as a hybrid derivative of Actinidia eriantha × Actinidia cylindrica, representing a rare case of hybrid species in kiwifruit that won the competition of ecological niches with one of its putative parental species, A. cylindrica. However, the hypothesized hybrid origin of A. fulvicoma is inconsistent with our specimen observations. Here, we present multiple lines of evidence to reject the hybrid speciation hypothesis for this species, despite genomic evidence for frequent interspecific gene flow. We collected the samples of A. fulvicoma in type locality and neighboring regions to contrast them with type specimen, and sequenced nuclear ribosomal DNA ITS, chloroplast trnL-trnF and mitochondrial nad2-i3, as well as four single-copy nuclear genes explored from kiwifruit genomes, to infer phylogenetic relationships among A. fulvicoma, its putative parental species, and their relatives. Our data definitely reveal that A. fulvicoma occupies an independent backbone lineage and it is not a hybrid. This study suggests that correct evolutionary applications on extensive surveys of the putative hybrid and its possible parents with strict criteria are necessary in the documentation of hybrid speciation to advance our understanding of the genomic basis of hybrid species. Frontiers Media S.A. 2020-02-04 /pmc/articles/PMC7011101/ /pubmed/32117405 http://dx.doi.org/10.3389/fgene.2019.01250 Text en Copyright © 2020 Yang, Fu, Xu, Song, Zhang, Yang and Wang http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Genetics Yang, Jie Fu, Weirui Xu, Haoming Song, Zhiping Zhang, Wenju Yang, Ji Wang, Yuguo An Empirical Analysis Rejects the Hybrid Speciation Hypothesis of a Crucial Kiwifruit Species, Despite Genomic Evidence of Frequent Interspecific Gene Flow in the Genus |
title | An Empirical Analysis Rejects the Hybrid Speciation Hypothesis of a Crucial Kiwifruit Species, Despite Genomic Evidence of Frequent Interspecific Gene Flow in the Genus |
title_full | An Empirical Analysis Rejects the Hybrid Speciation Hypothesis of a Crucial Kiwifruit Species, Despite Genomic Evidence of Frequent Interspecific Gene Flow in the Genus |
title_fullStr | An Empirical Analysis Rejects the Hybrid Speciation Hypothesis of a Crucial Kiwifruit Species, Despite Genomic Evidence of Frequent Interspecific Gene Flow in the Genus |
title_full_unstemmed | An Empirical Analysis Rejects the Hybrid Speciation Hypothesis of a Crucial Kiwifruit Species, Despite Genomic Evidence of Frequent Interspecific Gene Flow in the Genus |
title_short | An Empirical Analysis Rejects the Hybrid Speciation Hypothesis of a Crucial Kiwifruit Species, Despite Genomic Evidence of Frequent Interspecific Gene Flow in the Genus |
title_sort | empirical analysis rejects the hybrid speciation hypothesis of a crucial kiwifruit species, despite genomic evidence of frequent interspecific gene flow in the genus |
topic | Genetics |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7011101/ https://www.ncbi.nlm.nih.gov/pubmed/32117405 http://dx.doi.org/10.3389/fgene.2019.01250 |
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