Cargando…

Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia

Ecotypes are distinct populations within a species that are adapted to specific environmental conditions. Understanding how these ecotypes become established, and how they interact when reunited, is fundamental to elucidating how ecological adaptations are maintained. This study focuses on Themeda t...

Descripción completa

Detalles Bibliográficos
Autores principales: Dunning, Luke T., Olofsson, Jill K., Papadopulos, Alexander S. T., Hibdige, Samuel G. S., Hidalgo, Oriane, Leitch, Ilia J., Baleeiro, Paulo C., Ntshangase, Sinethemba, Barker, Nigel, Jobson, Richard W.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9828686/
https://www.ncbi.nlm.nih.gov/pubmed/36089907
http://dx.doi.org/10.1111/mec.16691
_version_ 1784867322785169408
author Dunning, Luke T.
Olofsson, Jill K.
Papadopulos, Alexander S. T.
Hibdige, Samuel G. S.
Hidalgo, Oriane
Leitch, Ilia J.
Baleeiro, Paulo C.
Ntshangase, Sinethemba
Barker, Nigel
Jobson, Richard W.
author_facet Dunning, Luke T.
Olofsson, Jill K.
Papadopulos, Alexander S. T.
Hibdige, Samuel G. S.
Hidalgo, Oriane
Leitch, Ilia J.
Baleeiro, Paulo C.
Ntshangase, Sinethemba
Barker, Nigel
Jobson, Richard W.
author_sort Dunning, Luke T.
collection PubMed
description Ecotypes are distinct populations within a species that are adapted to specific environmental conditions. Understanding how these ecotypes become established, and how they interact when reunited, is fundamental to elucidating how ecological adaptations are maintained. This study focuses on Themeda triandra, a dominant grassland species across Asia, Africa and Australia. It is the most widespread plant in Australia, where it has distinct ecotypes that are usually restricted to either wetter and cooler coastal regions or the drier and hotter interior. We generate a reference genome for T. triandra and use whole genome sequencing for over 80 Themeda accessions to reconstruct the evolutionary history of T. triandra and related taxa. Organelle phylogenies confirm that Australia was colonized by T. triandra twice, with the division between ecotypes predating their arrival in Australia. The nuclear genome provides evidence of differences in the dominant ploidal level and gene‐flow among the ecotypes. In northern Queensland there appears to be a hybrid zone between ecotypes with admixed nuclear genomes and shared chloroplast haplotypes. Conversely, in the cracking claypans of Western Australia, there is cytonuclear discordance with individuals possessing the coastal chloroplast and interior clade nuclear genome. This chloroplast capture is potentially a result of adaptive introgression, with selection detected in the rpoC2 gene which is associated with water use efficiency. The reason that T. triandra is the most widespread plant in Australia appears to be a result of distinct ecotypic genetic variation and genome duplication, with the importance of each depending on the geographic scale considered.
format Online
Article
Text
id pubmed-9828686
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-98286862023-01-10 Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia Dunning, Luke T. Olofsson, Jill K. Papadopulos, Alexander S. T. Hibdige, Samuel G. S. Hidalgo, Oriane Leitch, Ilia J. Baleeiro, Paulo C. Ntshangase, Sinethemba Barker, Nigel Jobson, Richard W. Mol Ecol Original Articles Ecotypes are distinct populations within a species that are adapted to specific environmental conditions. Understanding how these ecotypes become established, and how they interact when reunited, is fundamental to elucidating how ecological adaptations are maintained. This study focuses on Themeda triandra, a dominant grassland species across Asia, Africa and Australia. It is the most widespread plant in Australia, where it has distinct ecotypes that are usually restricted to either wetter and cooler coastal regions or the drier and hotter interior. We generate a reference genome for T. triandra and use whole genome sequencing for over 80 Themeda accessions to reconstruct the evolutionary history of T. triandra and related taxa. Organelle phylogenies confirm that Australia was colonized by T. triandra twice, with the division between ecotypes predating their arrival in Australia. The nuclear genome provides evidence of differences in the dominant ploidal level and gene‐flow among the ecotypes. In northern Queensland there appears to be a hybrid zone between ecotypes with admixed nuclear genomes and shared chloroplast haplotypes. Conversely, in the cracking claypans of Western Australia, there is cytonuclear discordance with individuals possessing the coastal chloroplast and interior clade nuclear genome. This chloroplast capture is potentially a result of adaptive introgression, with selection detected in the rpoC2 gene which is associated with water use efficiency. The reason that T. triandra is the most widespread plant in Australia appears to be a result of distinct ecotypic genetic variation and genome duplication, with the importance of each depending on the geographic scale considered. John Wiley and Sons Inc. 2022-09-27 2022-11 /pmc/articles/PMC9828686/ /pubmed/36089907 http://dx.doi.org/10.1111/mec.16691 Text en © 2022 The Authors. Molecular Ecology published by John Wiley & Sons Ltd. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://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 Articles
Dunning, Luke T.
Olofsson, Jill K.
Papadopulos, Alexander S. T.
Hibdige, Samuel G. S.
Hidalgo, Oriane
Leitch, Ilia J.
Baleeiro, Paulo C.
Ntshangase, Sinethemba
Barker, Nigel
Jobson, Richard W.
Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia
title Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia
title_full Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia
title_fullStr Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia
title_full_unstemmed Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia
title_short Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia
title_sort hybridisation and chloroplast capture between distinct themeda triandra lineages in australia
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9828686/
https://www.ncbi.nlm.nih.gov/pubmed/36089907
http://dx.doi.org/10.1111/mec.16691
work_keys_str_mv AT dunningluket hybridisationandchloroplastcapturebetweendistinctthemedatriandralineagesinaustralia
AT olofssonjillk hybridisationandchloroplastcapturebetweendistinctthemedatriandralineagesinaustralia
AT papadopulosalexanderst hybridisationandchloroplastcapturebetweendistinctthemedatriandralineagesinaustralia
AT hibdigesamuelgs hybridisationandchloroplastcapturebetweendistinctthemedatriandralineagesinaustralia
AT hidalgooriane hybridisationandchloroplastcapturebetweendistinctthemedatriandralineagesinaustralia
AT leitchiliaj hybridisationandchloroplastcapturebetweendistinctthemedatriandralineagesinaustralia
AT baleeiropauloc hybridisationandchloroplastcapturebetweendistinctthemedatriandralineagesinaustralia
AT ntshangasesinethemba hybridisationandchloroplastcapturebetweendistinctthemedatriandralineagesinaustralia
AT barkernigel hybridisationandchloroplastcapturebetweendistinctthemedatriandralineagesinaustralia
AT jobsonrichardw hybridisationandchloroplastcapturebetweendistinctthemedatriandralineagesinaustralia