Development of Barley Resistant to Spot Blotch and Genetics of Resistance

Abstract

(...) The resistance of these four cultivars and of many advanced breeding lines was derived from CI 7117-77 through ND B-112 and Dickson, which were developed at North Dakota State University. This resistance has been stable since its discovery in the mid-1950s. Other germ plasm resistant to B. sorokiniana has been developed from Wisc 691-1, CI 1227, CI 6311, CI 9584, and H. agriocrithon, sources that differ from ND B-112. In an inheritance study, resistance from ND B-112 and that from the other sources appeared to be conditioned by one or two genes. Some progenies of Minn 33 (derived from ND B-112) crossed with resistant lines that trace to CI 1227 and CI 6311 were moderately susceptible, indicating that different resistance genes were involved