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Published in Crop Sci 24:129-132 (1984)
© 1984 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Identification and Characterization of the Gene Conditioning Powdery Mildew Resistance in ‘Amigo’ Wheat1

J. R. Lowry, D. J. Sammons, P. S. Baenziger and J. G. Moseman2

‘Amigo’ wheat (Triticum aestivum L.), is a source of genetic resistance to greenbug (Schizaphis graminum Rondani) biotype C, and is reportedly resistant to powdery mildew (Erysiphe graminis D.C. ex. Merat. f. sp. tritici Em. Marchal). The objective of this research was to identify and characterize the gene(s) for powdery mildew resistance in Amigo wheat To verify that Amigo is resistant to powdery mildew, selected lines from a near-isogenic series carrying genes conditioning powdery mildew resistance, and ‘Kavkaz’, Amigo, and ‘Chancellor’ wheats were inoculated with culture 3 of E. graminis tritici and observed for disease reaction. Kavkaz is mildew resistant and Chancellor is known to be susceptible to powdery mildew. Crosses were made between Amigo and Chancellor, and between Amigo and the lines from the near-isogenic series and Kavkaz. Resulting F2 plants were inoculated with culture 3 of E. graminis tritici and rated for resistance. Results from the screening procedures confirmed that Amigo is mildew resistant and that resistance is conferred by a single dominant gene. The segregation ratios for the F2 populations of Amigo/isogenic series and Amigo/Kavkaz suggest the Amigo gene conferring mildew resistance is previously unreported. A possible linkage relationship between the genes for powdery mildew resistance in Amigo and ‘Asosan/8*Chancellor’ was tested. The F2 families of the cross Amigo/2/Asosan/8*Chancellor were inoculated with E. graminis tritici culture 3 and segregation ratios observed. Close linkage between the genes for resistance in Amigo and Asosan/8*Chancellor was confirmed.

Key Words: Erysiphe graminis f. sp. tritici • Isogenic series • Triticum aestivum L.

1 Joint contribution from the USDA-ARS and the Maryland Agric. Exp. Stn. Scientific Article No. A-3431, and contribution No. 6503 of the Maryland Agric. Exp. Stn., Dep. of Agronomy, College Park, MD 20742. Part of a thesis submitted by the senior author to the Graduate School of the Univ. of Maryland in partial fulfillment of the requirements for the M. S. degree.

2 Former graduate student (presently agricultural technician), Dep. of Agronomy, Univ. of Maryland; associate professor of crop breeding, Dep. of Agronomy, Univ. of Maryland, College Park, MD 20742; USDA research geneticist; and USDA research plant pathologist, Plant Genetics and Germplasm Institute, Beltsville Agricultural Research Cener, USDA, ARS, Beltsville, MD 20705.

Received for publication April 15, 1983.




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