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Susceptibility of Triticale, Rye, and Wheat to Stem Rust from these Three Hosts. L. López, Agronomist of the International Maize and Wheat Improvement Center (CIMMYT); S. Rajaram(2), and L. I. de Bauer(3). (2)Pathologist of the International Maize and Wheat Improvement Center (CIMMYT); (3)Professor, Colegio de Post-graduados, ENA, Chapingo, Mex. Phytopathology 64:266-267. DOI: 10.1094/Phyto-64-266.

The characterization of the stem rust occurring on Triticale was attempted by collecting spores of stem rust from Triticale, wheat and rye and inoculating them separately on seedlings of these hosts. Eleven out of 19 isolates from Triticale produced a susceptible reaction on some lines of Triticale and certain varieties of wheat and rye. The other eight isolates produced a resistant reaction on both rye and Triticale; whereas, on wheat the varietal reactions recorded involved resistance as well as susceptibility. Behavior of three races of Puccinia graminis tritici on the lines of Triticale, and varieties of wheat and rye was similar to that encountered with the isolates coming from Triticale. On the contrary the isolates from rye differed in virulence pattern from the races of P. graminis tritici and P. graminis isolates from Triticale on all three hosts. Nine out of 10 isolates from rye did not produce susceptible reaction on any of the varieties of wheat and lines of Triticale, but did produce differential reactions on rye. Only one isolate from rye behaved as P. graminis secalis when inoculated to the varieties of rye, but as P. graminis tritici when inoculated to the varieties of wheat, and was capable of producing susceptible reaction on the lines of Triticale.

Additional keywords: virulence genes.