Postulated Genes for Resistance to Stripe Rust in Selected CIMMYT and Related Wheats. H. J. Dubin, International Maize and Wheat Improvement Center (CIMMYT), Box 1336, Kathmandu, Nepal. R. Johnson, and R. W. Stubbs. Plant Breeding Institute, Cambridge, United Kingdom CB2 2LQ; and Research Institute for Plant Protection, Box 9060, Wageningen, The Netherlands. Plant Dis. 73:472-475. Accepted for publication 21 November 1988. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0472.

Infection type data were used to postulate the presence of stripe rust seedling resistance genes in 20 CIMMYT and related bread wheats. Yr3, Yr6, Yr7, and Yr9 were hypothesized to be present in 12 lines, either alone or in combination. The isolates used also indicated the presence of additional unknown seedling resistance genes. Four lines produced only low seedling infection types. Four other lines displayed adult plant resistance.

Keyword(s): Puccinia striiformis, Triticum aestivum, yellow rust.