Screening for and Inheritance of Resistance to Barley Leaf Stripe (Drechslera graminea)

摘要

For many years, attacks with barley leaf stripe were nearly non-existent in Denmark due to an extensive use of seed treatment with organic mercurials since the 1930's. The disease gained renewed importance, however, after this treatment first became reduced and later forbidden because it frequently reaches infection levels that require chemical treatment of the seed in order to avoid a yield reduction. Previously, screening for resistance to leaf stripe to a larger extent has been performed in USA and Canada and to a lesser extent in India Sweden, and Denmark. These investigations uncovered a markedly varying number of resistant varieties. The heredity of resistance was treated to only a limited extent in these investigations. On this background we decided to screen a large number of barleys in Nordic collections for resistance to leaf stripe, and to analyse pedigrees of barleys in order to see how resistance and a susceptible variety was analysed genetically. Results of these investigations are presented below. Keywords: Agriculture.