Submitted to: Plant Pathology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/4/2007
Publication Date: 9/30/2007
Citation: Reszka, E., Song, Q., Arseniuk, E., Cregan, P.B., Ueng, P.P. 2007. Use of wheat and rye SSR markers to map QTL controlling partial resistance to Stagonospora nodorum blotch disease in a DH population of winter triticale 'Pinokio' x 'Bogo'. Plant Pathology. 16:161-167. Interpretive Summary: Stagonospora nodorum blotch disease is an important foliar disease in cereals, but wheat and triticale with only moderate disease resistance whave been commercially available. The development of cultivars that are highly resistant to this disease is a strategy for ultimate disease control. Molecular markers associated with disease resistance in a triticale cultivar ‘Bogo’ were identified in this study. The markers will aid selection of highly disease resistant cultivars in breeding projects. The findings will be of interest to scientists and commercial seed companies.
Technical Abstract: Stagonospora nodorum blotch (SNB), is one of the most important foliar and glume diseases in triticale as well as other cereals. Due to the complexity of resistance mechanisms, it is difficult to assess resistance of triticale cultivars by conventional methods. Inheritance of SNB resistance in triticale is considered to be quantitative, and application of marker-assisted selection in breeding is an important strategy to develop new highly resistant triticale cultivars. Based on response as measured by three SNB resistance components (incubation period, disease severity and latent period) at the 5th – leaf stage (GS15), a population of double haploids derived from a cross between foliar susceptible cultivar Pinokio and resistant cultivar ‘Bogo’ was evaluated. With polymorphic wheat and rye simple sequence repeats (SSRs) markers, three quantitative trait loci (QTLs) located on chromosomes 4B, 5B and 6A were identified. The QTLs on 5B and 6A were consistent with reports of SNB resistance at similar chromosomal lociations in wheat.