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Mapping the Gene Pml for Resistance to Erysiphe graminis f. sp. tritici on Chromosome 7A of Wheat¹

The ‘Azaninster’ gene Pml in Triticum aestivum L. em. Thell. (aestivum group) for resistance to Erysiphe graminis DC. f., sp. tritici Em. Marchal was located on the long arm of chromosome 7A, 50 or more crossover units from the centromere. The gene was located through use of telocentrics. In competition with the complete 7A chromosome, the short-arm telocentric was transmitted through pollen to ,t2 of 215 offspring and the long-arm telocentric to none of 16.

Key Words: Disease resistance • Wheat cytogenetics • Telocentric chromosomes • Erysiphe graminis tritici

² Research Geneticist and Research Agronomist, respectively, Crops Research Division, ARS, USDA. Addresses: Genetics Department, Curtis Hall, University of Missouri, Columbia, and Plant Industry Station, Beltsville, Md. 20705.

Received for publication July 25, 1968.

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