Abstract
Forest trees are a sustainable source of biomass, which has not been fully exploited. It is important to provide forest feedstocks that have high yields in a variety of environments and that at the same time are suitable for multiple end-uses. Hybrid aspen (Populus tremula x tremuloides) is the fastest growing tree in Sweden and can be harvested under short rotation regimes after 20-25 years. In this project, we will identify genetic basis for both quantitative and qualitative aspects of wood formation in aspen (P. tremula) and utilize the results for breeding of new, superior varieties of hybrid aspen. Genome-wide association analysis will be performed in a Swedish collection of natural aspen trees, SwAsp, to identify genetic markers associated with important traits such as biomass production, fiber properties, bioprocessing properties and wood chemistry. Selected markers will after appropriate validation provide tools for accelerated breeding of hybrid aspen, allowing pyramiding of superior traits such as high biomass production, high oil content, low lignin content or extraordinary fiber qualities. The project is expected to result in expansion of the commercially available mix of hybrid aspen clones, raise the public interest in short-rotation forest crops and contribute to an overall shift towards a bio-based society.
Sweden