Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 25:623-626 (1985)
© 1985 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of Resistance to Stem Rust in the Wheat Cultivar Estanzuela Dakuru1

C. R. Riede, N. D. Williams and J. D. Miller2

The inheritance of seedling reaction in the greenhouse to cultures GB121, 111-SS2, and 72.00 of Puccinia graminis Pers. f. sp. tritici Eriks. & E. Henn. was studied in the F2, F3, backcross-F1, and backcross-F2 from resistant wheat (Triticum aestivum L.) cv. Estanzuela Dakuru crossed with susceptible ‘Little Club’ (LC) and ‘BH 1146’. The purpose was to determine the number and type of action of genes conditioning resistance. Tests with culture GB121 indicated that E. Dakuru had three genes (SrDG1, SrDG2, and SrDG3) for resistance so this culture. Gene SrDGI was epistatic to SrDG2 and SrDG3, and SrDG2 was epistatic to SrDG3. Tests with culture 111-SS2 indicated that E. Dakuru had four dominant genes (SrDSI, SrDS2, SrDS3, and SrDS4 for resistance to this culture. Genes SrDSI and SrDS4 were epistatic to genes SrDS2 and SrDS3. Gene SrDS2 was epistatic to gene SrDS3. The segregations in E. Dakaru/BH 1146 indicated that E. Dakuru had one gene for resistance to culture 72.00.

Key Words: Triticum aestivum L. • Puccinia graminis Pers. f. sp. tritici Eriks. & E. Henn • Host-pathogen relationships • Disease resistance

1 Cooperative investigations of USDA-ARS and the North Dakota Agric. Exp. Stn., Nbrth Dakota State Univ., Fargo, ND 58105. Published with the approval of the Director, North Dakota Agric. Exp. Stn. as Journal article 1380.

2 Plant breeder, IAPAR/CNPq, Caixa Postal 1331, 86100-Londrina-PR, Brazil (formerly graduate fellow, Dep. of Agronomy, North Dakota State Univ., Fargo), research geneticist and research lant atholo ist USDA-ARS North Dakota State Univ Fargo, ND 58105.

Received for publication September 6, 1984.




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Environmental Quality		 The Plant Genome
Copyright © 1985 by the Crop Science Society of America.