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The phylogeography of Fagus hayatae (Fagaceae): genetic isolation among populations

The beech species Fagus hayatae is an important relict tree species in subtropical China, whose biogeographical patterns may reflect floral responses to climate change in this region during the Quaternary. Previous studies have revealed phylogeography for three of the four Fagus species in China, bu...

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Autores principales: Ying, Ling‐Xiao, Zhang, Ting‐Ting, Chiu, Ching‐An, Chen, Tze‐Ying, Luo, Shu‐Jin, Chen, Xiao‐Yong, Shen, Ze‐Hao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801808/
https://www.ncbi.nlm.nih.gov/pubmed/27066254
http://dx.doi.org/10.1002/ece3.2042
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author Ying, Ling‐Xiao
Zhang, Ting‐Ting
Chiu, Ching‐An
Chen, Tze‐Ying
Luo, Shu‐Jin
Chen, Xiao‐Yong
Shen, Ze‐Hao
author_facet Ying, Ling‐Xiao
Zhang, Ting‐Ting
Chiu, Ching‐An
Chen, Tze‐Ying
Luo, Shu‐Jin
Chen, Xiao‐Yong
Shen, Ze‐Hao
author_sort Ying, Ling‐Xiao
collection PubMed
description The beech species Fagus hayatae is an important relict tree species in subtropical China, whose biogeographical patterns may reflect floral responses to climate change in this region during the Quaternary. Previous studies have revealed phylogeography for three of the four Fagus species in China, but study on F. hayatae, the most sparsely distributed of these species, is still lacking. Here, molecular methods based on eight simple sequence repeat (SSR) loci of nuclear DNA (nDNA) and three chloroplast DNA (cpDNA) sequences were applied for analyses of genetic diversity and structure in 375 samples from 14 F. hayatae populations across its whole range. Both nDNA and cpDNA indicated a high level of genetic diversity in this species. Significant fixation indexes and departures from the Hardy–Weinberg equilibrium, with a genetic differentiation parameter of R (st) of 0.233, were detected in nDNA SSR loci among populations, especially those on Taiwan Island, indicating strong geographic partitioning. The populations were classified into two clusters, without a prominent signal of isolation‐by‐distance. For the 15 haplotypes detected in the cpDNA sequence fragments, there was a high genetic differentiation parameter (G (st) = 0.712) among populations. A high G (st) of 0.829 was also detected outside but not within the Sichuan Basin. Consistent with other Fagus species in China, no recent population expansion was detected from tests of neutrality and mismatch distribution analysis. Overall, genetic isolation with limited gene flow was prominent for this species and significant phylogeographic structures existed across its range except for those inside the Sichuan Basin. Our study suggested long‐term geographic isolation in F. hayatae with limited population admixture and the existence of multiple refugia in the mountainous regions of the Sichuan Basin and southeast China during the Quaternary. These results may provide useful information critical for the conservation of F. hayatae and other Chinese beech species.
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spelling pubmed-48018082016-04-08 The phylogeography of Fagus hayatae (Fagaceae): genetic isolation among populations Ying, Ling‐Xiao Zhang, Ting‐Ting Chiu, Ching‐An Chen, Tze‐Ying Luo, Shu‐Jin Chen, Xiao‐Yong Shen, Ze‐Hao Ecol Evol Original Research The beech species Fagus hayatae is an important relict tree species in subtropical China, whose biogeographical patterns may reflect floral responses to climate change in this region during the Quaternary. Previous studies have revealed phylogeography for three of the four Fagus species in China, but study on F. hayatae, the most sparsely distributed of these species, is still lacking. Here, molecular methods based on eight simple sequence repeat (SSR) loci of nuclear DNA (nDNA) and three chloroplast DNA (cpDNA) sequences were applied for analyses of genetic diversity and structure in 375 samples from 14 F. hayatae populations across its whole range. Both nDNA and cpDNA indicated a high level of genetic diversity in this species. Significant fixation indexes and departures from the Hardy–Weinberg equilibrium, with a genetic differentiation parameter of R (st) of 0.233, were detected in nDNA SSR loci among populations, especially those on Taiwan Island, indicating strong geographic partitioning. The populations were classified into two clusters, without a prominent signal of isolation‐by‐distance. For the 15 haplotypes detected in the cpDNA sequence fragments, there was a high genetic differentiation parameter (G (st) = 0.712) among populations. A high G (st) of 0.829 was also detected outside but not within the Sichuan Basin. Consistent with other Fagus species in China, no recent population expansion was detected from tests of neutrality and mismatch distribution analysis. Overall, genetic isolation with limited gene flow was prominent for this species and significant phylogeographic structures existed across its range except for those inside the Sichuan Basin. Our study suggested long‐term geographic isolation in F. hayatae with limited population admixture and the existence of multiple refugia in the mountainous regions of the Sichuan Basin and southeast China during the Quaternary. These results may provide useful information critical for the conservation of F. hayatae and other Chinese beech species. John Wiley and Sons Inc. 2016-03-21 /pmc/articles/PMC4801808/ /pubmed/27066254 http://dx.doi.org/10.1002/ece3.2042 Text en © 2016 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Ying, Ling‐Xiao
Zhang, Ting‐Ting
Chiu, Ching‐An
Chen, Tze‐Ying
Luo, Shu‐Jin
Chen, Xiao‐Yong
Shen, Ze‐Hao
The phylogeography of Fagus hayatae (Fagaceae): genetic isolation among populations
title The phylogeography of Fagus hayatae (Fagaceae): genetic isolation among populations
title_full The phylogeography of Fagus hayatae (Fagaceae): genetic isolation among populations
title_fullStr The phylogeography of Fagus hayatae (Fagaceae): genetic isolation among populations
title_full_unstemmed The phylogeography of Fagus hayatae (Fagaceae): genetic isolation among populations
title_short The phylogeography of Fagus hayatae (Fagaceae): genetic isolation among populations
title_sort phylogeography of fagus hayatae (fagaceae): genetic isolation among populations
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801808/
https://www.ncbi.nlm.nih.gov/pubmed/27066254
http://dx.doi.org/10.1002/ece3.2042
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