Submitted to: Eastern Wheat Workers and Southern Small Grain Workers Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: March 20, 2007
Publication Date: April 15, 2007
Citation: Jin, Y., Szabo, L.J., Carson, M.L. 2007. Update on Ug99 (Race TTKS) Stem Rust Research. Eastern Wheat Workers and Southern Small Grain Workers Proceedings. p. 1-3. Technical Abstract: Since its initial discovery in Uganda in 1999, race TTKS of Puccinia graminis f.sp. tritici with virulence on Sr31 has spread to Kenya and Ethiopia (2001) and more recently, to Yemen and probably the Sudan. The vulnerability of wheat cultivars in Africa, the Middle East, and South Asia to this new race is alarming, with almost 25% of world wheat production in immediate jeopardy. This grave situation is the impetus behind the formation of the Global Rust Initiative by CIMMYT and ICARDA in 2005. Since 2005, the USDA Cereal Disease Lab in conjunction with NWIC, as well as USDA-NSGC, Aberdeen, ID and USDA-ARS, Raleigh, NC has evaluated U.S. wheat and barley germplasm for resistance to TTKS in Kenya field trials and in seedling tests at the CDL. The Cereal Disease Lab is also working with the USDA-ARS regional genotyping labs as well as several university labs in mapping and developing useful molecular markers for MAS of selected stem rust resistance genes in wheat and barley. We are also in the process of collecting stem rust isolates from around the world for race typing and genotyping using microsatellite markers we've developed. Particular attention is being given to isolates from Africa to elucidate the origin(s) of Ug99 and develop suitable markers for molecular identification.