Submitted to: International Congress of Plant Pathology Abstracts and Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 2/16/2008
Publication Date: 8/24/2008
Citation: Sanina, A.A., Paholkova, E.V., Chen, X. 2008. Physiological specialization of Stagonospora nodorum. J. Plant Pathol. 90(S2):239.
Technical Abstract: Septoriosis is a harmful disease of wheat, widespread all over the world, including Russia. Stagonospora nodorum (Berk.) Castellani and E.G. Germano is one of the main agents of Septoria wheat diseases. There is no information on physiological specialization of this pathogen. Not many authors studying cultivar x isolate interactions differentiate S. nodorum isolates into races, in consequence of the absence of different reactions of the hosts to the pathogen. Authors have emphasized only the degree of infection of plants as S. nodorum does not sporulate on plants under artificial growing conditions. We have worked out ways to induce the fungus to sporulate. Intensity of sporulation in vivo and degree of infection of the plants were used as parameters for determination of S. nodorum races. The morphological characteristics of isolate colonies on nutrient medium were taken into account. Isolates were divided into three main types and seven morphotypes. Twenty wheat cultivars were inoculated with 21 S. nodorum isolates from various regions and morphotype groups. Using the method of complete connection of cluster analysis, six cultivars with specific reactions to individual pathogen isolates were selected. From the 21 isolates, 17 races were identified.