Abstract only

Western Siberia has met Siberian races of stem rust back in 2007 as they broke the resistance of wheat cultivars putting the wheat production under a threat. Years of disease outbreaks in the region may reduce the wheat yield by as much as 50%. During ?the Cold War? stem rust was considered as a biological weapon that could wipe out the yield of cereal crops. An aggressive virulent race of stem rust (Ug99) was first reported in Uganda in 1999. The race may reach the Central Asian region in the nearest 3-5 years from where this pathogen may be carried away to the Western Siberia. Therefore, finding sources of resistance are increasingly important for wheat breeding. Goal of the research is to identify the sources of resistance to the aggressive race Ug99 and race populations of stem rust present in the Western Siberia. Resolving this goal will involve using shuttle breeding conducted jointly with the International Wheat and Maize Improvement Center (CIMMYT headquartered in Mexico). Assessments and observations for the germplasm complied with VIR methodological guidelines for wheat collection study (M, 1979). The stem rust research helped identify and map genes resistant to Ug99. (1). Major genes: a number of well-known genes - Sr25/Lr19, Sr1A.1R, SrACCadillac (6DS, close to Bt10); a number of recently mapped genes ?SrSha7 and SrSharp; non-mapped genes - SrHUW234. (2). Minor genes - polygenic resistance. (3). Unknown genes found in the following varieties from Kazakhstan, Omsk and Chelyabinsk: ?Stepnaya 62‟, ?Omskaya 37‟, ?Chelyaba 75‟. Analysis of Western Siberian Germplasm of Spring Bread Wheat identified 9 sources of resistance (BC1E.59/L.20639(22889); NS888 Lr19/Kormovaya 12; Om.20/Irt.10//L.444/3/Akt; NS888 Lr19/Lut.45-95; Eritr.23334; Eritr.23442; BC2E.59/L.20639 (22918); Lut.23419; ?Chelyaba 75‟) to the Siberian collection of stem rust races and in particular, to Ug99.

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CIMMYT Staff Publications Collection