Race-specific interactions between wheat genotypes and Indian cultures of stem rust

✍ Scribed by R. N. Sawhney; L. B. Goel

• Book ID: 104691276
• Publisher: Springer
• Year: 1981
• Tongue: English
• Weight: 494 KB
• Volume: 60
• Category: Article
• ISSN: 0040-5752
• DOI: 10.1007/bf00264522

✦ Synopsis

Near isogenic/substitution lines of stem rust resistance genes in different backgrounds of 'Marquis', 'Chinese Spring' and W 2691 and certain varieties with known genes for stem rust resistance were tested against each of 19 Indian cultures of stem rust races/biotypes (14, 15, 17, 21, 21A-1, 24, 34, 40, 40A, 42, 42B, 117, 117A, 117A-1, 122, 184, 194, 222 and 295). Sr 24 ('Sear's 3D/Ag'), Sr 24 (TR 380-27 4/3 Ag 14-White seeded recombinant with 'Agent' type resistance), Sr 25 ('Sear's 7D/Ag'), Sr 26 ('Eagle'), Sr 26 (Knott's 6A/Ag translocation), Sr 27 (WRT 238-5), Combination line (Sr Tt1 + Sr 9b) were observed to be completely effective against all the 19 cultures tested. In addition, a number of lines, such as TAF2d (Sr Agi), Line W(Sr Tt2) and Combination III (Sr Tt1 + Sr 9e), were found to be effective against at least three of the most prevalent races (21, 40A and 117A-1) and a virulent race 122 in Indian natural population. Lines carrying genes other than Sr 2, Sr 9a, Sr 9f ('Chinese Spring') and Sr 15 ('Norka'), and Line E were found to be resistant to one or more cultures of stem rust.The background effect upon the expression of a gene was observed by comparing the range of infection on single gene host lines in either different backgrounds and/or in cultivars with known genes for stem rust resistance against the 12 cultures of stem rust races found in India.