Randomly amplified polymorphic DNA loci from a walnut backcross [(Juglans hindsii x J-regia) x J-regia]

Twenty-five random decamer primers were used to evaluate the level of polymorphism between Persian walnut and the Northern California black walnut. Sixty-six randomly amplified polymorphic DNA (RAPD) markers mere identified using an interspecific walnut backcross population [(Juglans hindsii x J. regia) x J. regia]. Segregation data from these polymorphisms were joined to a previously published set of restriction fragment-length polymorphism (RFLP) marker data to expand the genetic map of walnut to 107 markers in 15 linkage groups.