Late blight resistant potato germplasm release AWN86514-2

Potato breeding selection AWN86514-2, Solanum tuberosum gp tuberosum, is be ing released as germplasm that is highly resistant to prevalent North Ameri can strains of Phytophthora infestans. This selection has been tested under field conditions in Mount Vernon, Washington (P. infestans US11 and US8 wi th complex virulence pathotypes), as well as Corvallis, Oregon, and eight o ther locations in North America (predominantly P. infestans US8) between 19 94 and 1997. Both foliage and tubers show partial resistance, Although AWN8 6514-2 is pollen sterile, it can be successfully used as a female parent. A n average of 34% of the progeny from crosses between AWN86514-2 and four su sceptible clones mere resistant to late blight when tested at Toluca, Mexic o, in 1996. AWN86514-2 also has high resistance to Verticillium wilt and po tato virus Y. AWN86514-2 is late maturing, with medium yields of smooth, lo ng-oblong, buff-skinned tubers. Specific gravity is high and french fry col or from 7 C (45 F) storage is excellent. The male parent of AWN86514-2 was Ranger Russet, a dual purpose french fry and fresh market variety, and the female parent was KSA195-96, a selection made at Aberdeen, Idaho, fi om Pol ish germplasm received as true seed from the Polish Plant Breeding and Accl imatization Institute. Possible sources of the late blight resistance in th is clone include S. acaule, S. demissum, S. phureja, S. simiplicifolium, S. stoloniferum, and S. tuberosum gp andigena which are in the Lineage of KSA 195-96. This germplasm was developed and released by USDA-ARS in cooperatio n with the Agricultural Experiment Stations of Idaho, Oregon, and Washingto n.