345-10 Genomic Footprints of Speciation and Selection in Populus Trichocarpa (Western poplar).
ones that have long life span and a slow rate of reproduction. This effect has already been
seen in trees as the change in range of some species, and change in timings of different
phenological traits. In order to deal with this impact, species need some amount of time to
modify their genetics, and come up with mechanism of survival. Considering the pace of
climate change, and its predicted pace in future (by the IPCC), we can’t leave it up to plants
and need to come up with some strategy to help mitigate these climate effects. One solution
to this problem is by studying the genetics of the organism, i.e. trees in our case, and
identify the genes and patterns of genetic variation, which could play a significant role in
controlling physiology and phenology of the organism. Identifying those gene variants in
the natural population and selecting and deploying the favorable genotypes, which can
perform better in the predicted future weather scenario (termed as assisted migration)
could help us deal with this problem.
In this study, we sequenced 456 accessions of Populus trichocarpa, from all across the west
coast. We used population genomic approaches and evolutionary genomics scenarios to
build different speciation and demographic models, and tried fitting those models with the
empirical data. Using statistical approaches as Maximum Likelihood, and Akaike
Information Criterion (AIC), we selected the best demographic model in our scenario. We
also used various parallel approaches to verify our results, and used FST based methods to
find the significant snps’ associated with diversifying selection or local adaptation.
Using these results helped us define what are the major factors effecting the genetics of the
organism, and which patterns of genetic variation are important for local adaptation.