ArticleGenome biology and evolution2021
Repeatome-Based Phylogenetics in Pelargonium Section Ciconium (Sweet) Harvey.
Article in Genome biology and evolution, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The repetitive part of the genome (the repeatome) contains a wealth of often overlooked information that can be used to resolve phylogenetic relationships and test evolutionary hypotheses for clades of related plant species such as Pelargonium. We have generated genome skimming data for 18 accessions of Pelargonium section Ciconium and one outgroup. We analyzed repeat abundancy and repeat similarity in order to construct repeat profiles and then used these for phylogenetic analyses. We found that phylogenetic trees based on read similarity were largely congruent with previous work based on morphological and chloroplast sequence data. For example, results agreed in identifying a "Core Ciconium" group which evolved after the split with P. elongatum. We found that this group was characterized by a unique set of repeats, which confirmed currently accepted phylogenetic hypotheses. We also found four species groups within P. sect. Ciconium that reinforce previous plastome-based reconstructions. A second repeat expansion was identified in a subclade which contained species that are considered to have dispersed from Southern Africa into Eastern Africa and the Arabian Peninsula. We speculate that the Core Ciconium repeat set correlates with a possible WGD event leading to this branch.
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