We recently returned from a trip to the impressive Umeå Plant Science Centre, where we learnt more about tree genomics. UPSC is home to a lot of the cutting-edge work sequencing the genome of the European aspen (Populus tremula), though other species as well, such as Norway spruce (Picea abies). Although work with P. tremula, particularly genome assembly, has been slowed by the much higher levels of sequence variation than in other tree species, it is producing a number of really novel findings, strengthened by large-scale latitudinal studies.
For example, a recent common garden experiment with genotypes from across Sweden found that foliar herbivores reflected the genetic structure of plant defense genes, with fewer herbivores on trees from the local region than those that originated further away. During our trip, Benedicte Albrectsen kindly took us to see one of these more recent experiments, where different genotypes were being exposed to simulated nitrogen deposition to test how foliar metabolites associated with plant defenses might change in the future. There was quite a clear N effect as you can see above!
We’re now hoping to start putting together some attempts at merging some of this growing genomic data with biogeography. This isn’t a new idea by any means, but we’re hoping to bring some fresh eyes to the questions. As always, any thoughts are welcomed below!