Date of this Version
Kiesselbach, T.A. and Peltier, George L. (1926) The differential reaction of strains within a variety of wheat to physiologic forms of Puccinia graminis tritici (Research Bulletin: Bulletin of the Agricultural Experiment Station of Nebraska No. 39)
Black stem rust of wheat (Puccinia graminis tritici (Pers.) Erikss. & Henn.), which occurs in Nebraska and thruout most of the wheat producing regions of the world, is of a composite nature, in that it consists of a number of physiologic forms which can be determined by their action on different varieties of Triticum species, as shown by Stakman and Levine. The ordinary commercial variety of wheat may likewise be regarded as a mixture, in that it consists of numerous strains, which differ in some more or less important characteristics, as has been frequently indicated in the literature concerning wheat improvement. The object of this investigation has been to analyze such a commercial mass-variety of wheat from the standpoint of the differential reaction of its component strains to a number of the physiologic forms of Puccinia graminis tritici found in Nebraska. The applied significance of such a study would be the discovery of productive wheat strains in a commercial variety, which are resistant to a relatively large number of prevalent physiologic forms, thereby reducing the likelihood of severe rust damage from season to season, as it has been determined (unpublished data) from epidemiological studies in Nebraska that the physiologic forms which occur in the field may vary in number, identity, distribution, and intensity in different seasons.