![]() New Phytologist © 2019 New Phytologist Trust. Populus balancing selection gene flow phylogenomics trans-specific polymorphisms. Our results provide a framework for the diversification of model tree genus that will facilitate future comparative studies. These are potentially important contributors to adaptive variation. ![]() Both gene flow and selection-mediated ancient polymorphisms are prevalent in the genus Populus. These genes were mainly associated with mating compatibility, growth and stress resistance. We identified 45 candidate genes with ancient polymorphisms maintained by balancing selection. large effective population sizes and rates of long-term gene flow. Considerable cpDNA variation was detected in the hybrid zone, as well as ancestral cpDNA polymorphism furthermore, the distribution of haplotypes indicates limited interpopulation gene flow via. Genetics 182:205216 Stephan W, Langley CH (1998) DNA polymorphism in Lycopersicon. Restriction site and sequence data were subjected to phylogeographic and population genetic analyses. Our results indicated that gene flow has been widespread within each clade and also occurred among the four clades during their early divergence. Haplotypes were sequenced for all cpDNA regions. A few interspecific relationships remained unresolved within the multiple-species clade because of inconsistent gene trees. Our species tree analyses recovered four main clades in the genus based on consensus nuclear phylogenies, but in conflict with the plastome phylogeny. We constructed phylogenetic trees of 29 Populus taxa using 80 individuals based on re-sequenced genomes. ![]() In this study, we aimed to examine the prevalence of these factors during the diversification of Populus, a model tree genus in the Northern Hemisphere. Phylogenetic analysis is complicated by interspecific gene flow and the presence of shared ancestral polymorphisms, particularly those maintained by balancing selection. ![]()
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