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Hybridization Between Yuccas From Baja California: Genomic and Environmental Patterns
Hybridization can occur when two geographically isolated species are reproductively compatible and have come into sympatry due to range shifts. Yucca and yucca moths exhibit obligate pollination mutualism; yucca moths are responsible for the gene flow mediated by pollen among yucca populations. In t...
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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/PMC7358647/ https://www.ncbi.nlm.nih.gov/pubmed/32733491 http://dx.doi.org/10.3389/fpls.2020.00685 |
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author | Arteaga, Maria Clara Bello-Bedoy, Rafael Gasca-Pineda, Jaime |
author_facet | Arteaga, Maria Clara Bello-Bedoy, Rafael Gasca-Pineda, Jaime |
author_sort | Arteaga, Maria Clara |
collection | PubMed |
description | Hybridization can occur when two geographically isolated species are reproductively compatible and have come into sympatry due to range shifts. Yucca and yucca moths exhibit obligate pollination mutualism; yucca moths are responsible for the gene flow mediated by pollen among yucca populations. In the Baja California Peninsula, there are two yucca sister species, Y. capensis and Y. valida, that have coevolved with the same pollinator, Tegeticula baja. Both yucca species are endemic to the peninsula, and their current distributions are allopatric. Based on their morphological characteristics, it has been suggested that some plants growing in the southern part of the Magdalena flatland, a spatially disjunct part of Yucca valida’s range, have hybrid origins. We conducted genomic and climatic analyses of the two yucca species as well as the putative hybrid populations. We genotyped 3,423 single nucleotide polymorphisms in 120 individuals sampled from 35 localities. We applied Bayesian tests and geographic cline analyses to the genomic data. Using climatic information from the occurrence sites, we projected species distribution models in different periods to assess changes in the distributional range, and we performed a statistical test to define the niche divergence between the paternal species and the putative hybrid populations. Structure analysis revealed mixed ancestry in the genome of hybrid populations, and the Bayesian models supported a scenario of post-divergence gene flow between the yucca species. Our species distribution models reveal that the geographical ranges of the parental species overlapped mainly during the Last Glacial Maximum, which could facilitate genetic admixture between those species. Finally, we found that most of the assessed environmental axes between the parents and hybrid populations are divergent, indicating that the climatic niche of the hybrid populations is shifting from that of the populations’ progenitors. Our results show that the populations in the southern part of the Magdalena flatland are the result of combination of the genetic components of two species. Hybrid individuals with this novel genomic combination arose in a different habitat than their parental species, and they exhibit ecological divergence, which contributes to reproductive isolation through spatial and temporal barriers. |
format | Online Article Text |
id | pubmed-7358647 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-73586472020-07-29 Hybridization Between Yuccas From Baja California: Genomic and Environmental Patterns Arteaga, Maria Clara Bello-Bedoy, Rafael Gasca-Pineda, Jaime Front Plant Sci Plant Science Hybridization can occur when two geographically isolated species are reproductively compatible and have come into sympatry due to range shifts. Yucca and yucca moths exhibit obligate pollination mutualism; yucca moths are responsible for the gene flow mediated by pollen among yucca populations. In the Baja California Peninsula, there are two yucca sister species, Y. capensis and Y. valida, that have coevolved with the same pollinator, Tegeticula baja. Both yucca species are endemic to the peninsula, and their current distributions are allopatric. Based on their morphological characteristics, it has been suggested that some plants growing in the southern part of the Magdalena flatland, a spatially disjunct part of Yucca valida’s range, have hybrid origins. We conducted genomic and climatic analyses of the two yucca species as well as the putative hybrid populations. We genotyped 3,423 single nucleotide polymorphisms in 120 individuals sampled from 35 localities. We applied Bayesian tests and geographic cline analyses to the genomic data. Using climatic information from the occurrence sites, we projected species distribution models in different periods to assess changes in the distributional range, and we performed a statistical test to define the niche divergence between the paternal species and the putative hybrid populations. Structure analysis revealed mixed ancestry in the genome of hybrid populations, and the Bayesian models supported a scenario of post-divergence gene flow between the yucca species. Our species distribution models reveal that the geographical ranges of the parental species overlapped mainly during the Last Glacial Maximum, which could facilitate genetic admixture between those species. Finally, we found that most of the assessed environmental axes between the parents and hybrid populations are divergent, indicating that the climatic niche of the hybrid populations is shifting from that of the populations’ progenitors. Our results show that the populations in the southern part of the Magdalena flatland are the result of combination of the genetic components of two species. Hybrid individuals with this novel genomic combination arose in a different habitat than their parental species, and they exhibit ecological divergence, which contributes to reproductive isolation through spatial and temporal barriers. Frontiers Media S.A. 2020-05-28 /pmc/articles/PMC7358647/ /pubmed/32733491 http://dx.doi.org/10.3389/fpls.2020.00685 Text en Copyright © 2020 Arteaga, Bello-Bedoy and Gasca-Pineda. 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 | Plant Science Arteaga, Maria Clara Bello-Bedoy, Rafael Gasca-Pineda, Jaime Hybridization Between Yuccas From Baja California: Genomic and Environmental Patterns |
title | Hybridization Between Yuccas From Baja California: Genomic and Environmental Patterns |
title_full | Hybridization Between Yuccas From Baja California: Genomic and Environmental Patterns |
title_fullStr | Hybridization Between Yuccas From Baja California: Genomic and Environmental Patterns |
title_full_unstemmed | Hybridization Between Yuccas From Baja California: Genomic and Environmental Patterns |
title_short | Hybridization Between Yuccas From Baja California: Genomic and Environmental Patterns |
title_sort | hybridization between yuccas from baja california: genomic and environmental patterns |
topic | Plant Science |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7358647/ https://www.ncbi.nlm.nih.gov/pubmed/32733491 http://dx.doi.org/10.3389/fpls.2020.00685 |
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