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6 results for “Themeda triandra”
Spatial, climate and ploidy factors drive genomic diversity and resilience in the widespread grass Themeda triandra
<p>This data set was used to assess the climate resilience of <i>Themeda triandra</i>, a foundational species and the most widespread plant in Australia, by assessing the relative contributions of spatial, environmental, and ploidy factors to contemporary genomic variation. Reduced-representation genome sequencing on 472 samples from 52 locations was used to test how the distribution of genomic variation, including ploidy polymorphism, supports adaptation to hotter and drier climates.</p>
Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia
<p>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 de novo 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 colonised 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 why 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.</p>
Spatial, climate and ploidy factors drive genomic diversity and resilience in the widespread grass Themeda triandra
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Hybridisation and chloroplast capture between distinct Themeda triandra lineages in Australia
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cpDNA sequecnes of Themeda triandra and Heteropogon contortus
<p>To investigate the historical continuity of grassy biomes in southwest China, we examined the biogeographies and evolutionary histories of two widespread and dominant C<sub>4</sub> grasses, <i>Themeda triandra</i> and <i>Heteropogon contortus</i>, in Yunnan and southern Sichuan provinces, using chloroplast DNA markers in combination with climate data.</p>
cpDNA sequecnes of Themeda triandra and Heteropogon contortus
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.