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Additive Resistance in Wheat to Puccinia striiformis. J. M. Krupinsky, Former biological technician, Agricultural Research Service, U.S. Department of Agriculture (USDA), Montana State University, Bozeman, MT 59717, Present address o f senior author: plant pathologist, Science and Education Administration, USDA, Northern Great Plains Research Center, P.O. Box 459, Mandan, ND 58554; E. L. Sharp, professor of plant pathology, Department of Plant Pathology, Montana State University, Bozeman, MT 59717. Phytopathology 68:1795-1799. Accepted for publication 3 August 1978. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-1795.

Gene action for resistance to Puccinia striiformis was determined in minor gene lines of wheat derived from crosses of PI 178383/Itana//commercial cultivars. The minor gene lines were intercrossed in one diallel and intercrossed with susceptible winter wheat cultivars in a second diallel. The two diallel analyses showed the presence of additional gene action and high heritabilities and indicated that this apparently general type of resistance could be manipulated easily in a breeding program.

Additional keywords: general resistance, yellow rust, minor gene resistance, diallel analysis.