title: Transfer of tuber soft rot and early blight resistances from Solanum brevidens into cultivated potato.
abstract: Tuber soft rot and early blight are serious potato diseases. Development of potato varieties resistant to these diseases has been hindered by the scarcity of resistant germplasm. A diploid wild species, Solanum brevidens, shows significant resistance to both diseases. Numerous potato breeding lines have been developed from a potato- S. brevidens somatic hybrid, A206. A BC(3) clone, C75-5+297, derived from this somatic hybrid as well as its BC(1) and BC(2) parental lines showed resistance to both tuber soft rot and early blight. Clone C75-5+297 has consistently out-yielded common varieties under disease stress. Using both molecular and cytogenetic approaches we demonstrated that a single copy of chromosome 8 from S. brevidens replaced a potato chromosome 8 in C75-5+297. Thus, C75-5+297 represents a potato- S. brevidens chromosome substitution line. Our results suggest that the presence of a single chromosome from S. brevidens may significantly impact the resistance to multiple potato diseases. The high yield potential of C75-5+297 makes it an excellent parent for developing potato varieties with resistances to both tuber soft rot and early blight.
authors.affiliation: Department of Horticulture, University of Wisconsin, Madison, WI 53706, USA.
authors.forename: Ahmet L
authors.initials: AL
authors.lastname: Tek
authors.forename: Walter R
authors.initials: WR
authors.lastname: Stevenson
authors.forename: John P
authors.initials: JP
authors.lastname: Helgeson
authors.forename: Jiming
authors.initials: J
authors.lastname: Jiang
mesh_terms: D000383:Agriculture / Q000379:methods; D000528:Alternaria; D032461:Chromosomes, Plant / Q000235:genetics; D003433:Crosses, Genetic; D007113:Immunity, Innate / Q000235:genetics*; D017404:In Situ Hybridization, Fluorescence; D016973:Pectobacterium carotovorum; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology*; D030821:Plants, Genetically Modified; D012150:Polymorphism, Restriction Fragment Length; D011198:Solanum tuberosum / Q000235:genetics / Q000382:microbiology*