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Synopsis: Resistant variants observed in earlier experiments were found to result from field hybridization. New experiments yielded variants at low frequency in one instance but none in another. One mutant showed a previously unknown temperature-sensitive response for resistance to race 7A of Puccinia grammis avenae.
2 Formerly Associate Geneticist, Biology Dept., Brookhaven National Laboratory, now Associate Agronomist and Associate Professor of Agronomy, State College of Washington, Pullman.
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