Plant & Animal Genome VI Conference

W45

DETECTION OF QTL CONTROLLING DORMANCY RELATED TRATIS IN POPLAR

1. Center for Urban Horticulture, UW, 3501 NE 41st St., Seattle, WA 98195
2. Oregon State University, Corvallis, Or 97331-7304
3. Department of Forest Resources, Universtiy of Minnesota, St. Paul, MN 55108-1027

By becoming dormant, the shoots of temperate woody perennials are able to withstand cold, potentially damaging temperatures. In addition to being critical for survival, dormancy is related to the quantity and quality of wood produced. The timing of the stages in the dormancy process varies between trees originating in northern and southern latitudes. An F₂ population segregating for dormancy-related traits was produced from from a cross between a female Populus trichocarpa of northern origin and a male Populus deltoides of southern origin. Four dormancy related traits were measured in this F₂ population: bud set, degree of dormancy, chilling requirements, and spring bud flush. A linkage map was constructed using ~500 AFLP and RAPD markers, and used to search for QTL controlling these four traits.