Abstract

Much is known about the relative susceptibility of varieties of common wheat to leaf rust, Puccinia triticina Eriks., and the behavior of many varieties of durum and emmer also is well known. However, relatively little is known concerning the reaction to leaf rust of many of the rarer species of Triticum and related species of cereals and grasses. In studies conducted in the greenhouse at the Kansas Agricultural Experiment Station during the period 1931 to 1940, inclusive, a large number of varieties and species of wheat and related grasses have been inoculated with known physiologic races of leaf rust of wheat. The purpose of these investigations was twofold, first to discover sources of resistance as possible parental stocks in a program of breeding for resistance, and second to throw additional light on the phylogenetic origin of resistance in wheat. The data herein presented summarize part of the results obtained.

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