Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia
© 2022 The Authors. Molecular Ecology published by John Wiley & Sons Ltd..
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.
| Medienart: |
E-Artikel |
|---|
| Erscheinungsjahr: |
2022 |
|---|---|
| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:31 |
|---|---|
| Enthalten in: |
Molecular ecology - 31(2022), 22 vom: 27. Nov., Seite 5846-5860 |
| Sprache: |
Englisch |
|---|
| Beteiligte Personen: |
Dunning, Luke T [VerfasserIn] |
|---|
| Links: |
|---|
| Themen: |
Adaptation |
|---|
| Anmerkungen: |
Date Completed 10.11.2022 Date Revised 11.01.2023 published: Print-Electronic Citation Status MEDLINE |
|---|
| doi: |
10.1111/mec.16691 |
|---|
| funding: |
|
|---|---|
| Förderinstitution / Projekttitel: |
|
| PPN (Katalog-ID): |
NLM346068827 |
|---|
| LEADER | 01000naa a22002652 4500 | ||
|---|---|---|---|
| 001 | NLM346068827 | ||
| 003 | DE-627 | ||
| 005 | 20231226030539.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 231226s2022 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.1111/mec.16691 |2 doi | |
| 028 | 5 | 2 | |a pubmed24n1153.xml |
| 035 | |a (DE-627)NLM346068827 | ||
| 035 | |a (NLM)36089907 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rakwb | ||
| 041 | |a eng | ||
| 100 | 1 | |a Dunning, Luke T |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia |
| 264 | 1 | |c 2022 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ƒaComputermedien |b c |2 rdamedia | ||
| 338 | |a ƒa Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Date Completed 10.11.2022 | ||
| 500 | |a Date Revised 11.01.2023 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © 2022 The Authors. Molecular Ecology published by John Wiley & Sons Ltd. | ||
| 520 | |a 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 | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a adaptation | |
| 650 | 4 | |a andropogoneae | |
| 650 | 4 | |a angiosperms | |
| 650 | 4 | |a ecological genetics | |
| 650 | 4 | |a phylogeography | |
| 650 | 4 | |a population genetics | |
| 700 | 1 | |a Olofsson, Jill K |e verfasserin |4 aut | |
| 700 | 1 | |a Papadopulos, Alexander S T |e verfasserin |4 aut | |
| 700 | 1 | |a Hibdige, Samuel G S |e verfasserin |4 aut | |
| 700 | 1 | |a Hidalgo, Oriane |e verfasserin |4 aut | |
| 700 | 1 | |a Leitch, Ilia J |e verfasserin |4 aut | |
| 700 | 1 | |a Baleeiro, Paulo C |e verfasserin |4 aut | |
| 700 | 1 | |a Ntshangase, Sinethemba |e verfasserin |4 aut | |
| 700 | 1 | |a Barker, Nigel |e verfasserin |4 aut | |
| 700 | 1 | |a Jobson, Richard W |e verfasserin |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t Molecular ecology |d 1993 |g 31(2022), 22 vom: 27. Nov., Seite 5846-5860 |w (DE-627)NLM013262866 |x 1365-294X |7 nnns |
| 773 | 1 | 8 | |g volume:31 |g year:2022 |g number:22 |g day:27 |g month:11 |g pages:5846-5860 |
| 856 | 4 | 0 | |u http://dx.doi.org/10.1111/mec.16691 |3 Volltext |
| 912 | |a GBV_USEFLAG_A | ||
| 912 | |a GBV_NLM | ||
| 951 | |a AR | ||
| 952 | |d 31 |j 2022 |e 22 |b 27 |c 11 |h 5846-5860 | ||