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Published in Crop Sci 11:556-558 (1971)
© 1971 Crop Science Society of America
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Monosomic Analyses of Genes for Stem Rust Resistance Derived from Marquis and Reliance Wheats1

M. K. Anderson, N. D. Williams and S. S. Maan2

We determined the chromosomal locations of genes for resistance to culture 111-SS2 of Puccinia graminis Pers. f. sp. tritici Eriks. & E. Henn. in Triticum aestivum L. em. Thell ssp. vulgare (Vill., Host) Mac Kay ‘Marquis’ and ‘Reliance’. Six wheat lines, Mq-A, Mq-B, Mq-C, R1-A, R1-B, and R1-C, which have monogenic resistance derived from Marquis/T. aestivum L. em. Thell ssp. compactum (Host) Mac Key ‘Little Club’ and Reliance/Little Club, were crossed with each of the 21 ‘Chinese Spring’ monosomics. F2 and backcross-F1 seedlings from each of the crosses were tested for reaction to culture 111-SS2. Significant deviations from disomic toward monosomic ratios in the F2 and backcross-F1 were used to identify the chromosomes that had the genes for rust resistance. Mq-A and R1-A have a gene (Srl8) on chromosome 1D, Mq-B has a gene (Srl9) on 2B, Mq-C and R1-C have a gene (Sr20) on 2B, and R1-B has a gene (Srl6) on 2B for resistance to culture 111-SS2.

Key Words: Aneuploid • Chromosome • Cytogenetics • Triticum aestivum L. • Puccinia graminis Pers

1 Cooperative investigations, Plant Science Research Division, Agricultural Research Service, U. S. Department of Agriculture and the North Dakota Agricultural Experiment Station, North Dakota State University, Fargo, N. D. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D, degree. Paper No. 251 of the North Dakota Agricultural Experiment Station, Fargo.

2 Former NDEA Graduate Fellow, North Dakota State University (now Assistant Professor, Department of Agronomy, University of Kentucky, Lexington, Ky. 40506); Geneticist, Plant Science Research Division, Agricultural Research Service, U. S. Department of Agriculture, Fargo, N. D.; and Associate Professor, Department of Agronomy, North Dakota State University, Fargo, N. D., respectively.

Received for publication January 27, 1971.




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