Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 13:388-389 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Relation of Genes from Hope and Red Egyptian Wheat for Reaction to Stem Rust1

N. D. Williams and J. D. Miller2

Wheat (Triticum aestivum) line ISr9d-Ra, having a gene (Sr9d) for resistance to stem rust (Puccinia graminis f. sp. tritici) from ‘Hope,2019; was crossed with ISr9a-Ra, having a gene (Sr9a) for resistance from ‘Red Egyptian.’ The purpose of the cross was to investigate the linkage or allelic relations between the two genes. The F2 and F3 were inoculated simultaneously with a culture of stem rust race 121 having grey-brown urediospores and a culture of race 29 having reddish-brown urediospores. We did not recover recombinants among 746 gametes from F1 plants heterozygous for the two genes and 4140 seedlings from heterozygous F2 plants. The genes from Hope and Red Egyptian were allelic or closely linked.

Key Words: Triticum aestivum L. • Puccinia graminis f. sp. tritici Eriks & E. Henn. • Linkage • Allelism

1 Cooperative Investigations of the Agricultural Research Service, USDA, and the North Dakota Agricultural Experiment Station, North Dakota State University, Fargo, N. D. Paper No. 382 of the North Dakota Agricultural Experiment Station, Fargo.

2 Geneticist and Plant Pathologist, ARS, USDA, Fargo, N. D. 58102.

Received for publication November 18, 1972.




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