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Additive Genes in Wheat Conditioning Resistance to Stripe Rust. E. L. Sharp, Professor of Plant Pathology, Department of Botany and Microbiology, Montana State University, Bozeman 59715; R. B. Volin, Graduate Research Assistant, Department of Botany and Microbiology, Montana State University, Bozeman 59715. Phytopathology 60:1146-1147. DOI: 10.1094/Phyto-60-1146.

Wheat selections containing various additive genes obtained from P.I. 178383 and Itana wheats showed similar levels of resistance to 11 cultures of Puccinia striiformis known to possess different genes for virulence. Moro wheat, which contains only the major gene from P.I. 178383, was susceptible to one isolate, but other wheat cultivars and selections with minor additive genes from P.I. 178383 and Itana were intermediate or resistant in reaction to this isolate as well as to all others. The possibility of utilizing minor additive genes in developing long-lasting resistance to stripe rust is discussed.