New Wheat Lines with Known Resistance Genes for Identification of Indian Wheat Stem Rust Races. R. N. Sawhney, Division of Genetics, Indian Agricultural Research Institute, New Delhi 110012, India. L. B. Goel, Division of Genetics, Indian Agricultural Research Institute, New Delhi 110012, India. Plant Dis. 64:849-850. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-849.

Physiologic races of stem rust in India have been distinguished on a set of 12 Stakman differential cultivars; the resistance genes in these lines are few and mostly different from those available in the breeding material in India and are thus inadequate in identifying stem rust virulence genes. Wheats Sr-9b-Mq, Sr10-Mq, Sr13-Mq, Sr22-Mq, combination III (SrTt1, Sr9e), Mentana (Sr8), Einkorn (Sr21), and TAF 2d (Sr Agi.) should be used to distinguish type races of stem rust, and Yalta (Sr11 and Yt1 & Yt2) and McMurachy (Sr6) should be used to differentiate biotypes from races. The lines carrying Sr26 (Eagle) and Sr27 (WRT 238-5) were completely resistant to Indian stem rust races and biotypes and are therefore suggested for detecting new virulence genes. The new differential series will be useful in detecting genetic variation in the pathogen corresponding to the resistance genes.