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Resistance

Genetic Factors Conditioning Slow Rusting in Era Wheat. J. M. S. Martinez-Gonzalez, Departments of Agronomy and Plant Genetics, Plant Pathology, and Cereal Rust Laboratory, Agricultural Research Service, U.S. Department of Agriculture, University of Minnesota, St. Paul 55108; Roy D. Wilcoxson(2), D. D. Stuthman(3), D. V. McVey(4), and R. H. Busch(5). (2)(3)(4)(5)Departments of Agronomy and Plant Genetics, Plant Pathology, and Cereal Rust Laboratory, Agricultural Research Service, U.S. Department of Agriculture, University of Minnesota, St. Paul 55108. Phytopathology 73:247-249. Accepted for publication 16 August 1982. Copyright 1983 The American Phytopathological Society. DOI: 10.1094/Phyto-73-247.

Slow rusting with Puccinia graminis f. sp. tritici, as indicated by the area under the disease progress curve, was found in progenies of Era/Morocco and Era/Prelude tested in the field during 1977 and 1978. Slow rusting in Era appeared to be a quantitative character because progenies from both crosses were continuously distributed from slow to fast rusting. Furthermore, progeny means equaled midparent means in three of four evaluations. The heritability estimate was 41% for Era/Morocco and 45% for Era/Prelude.