VIEW ARTICLE

Resistance

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.