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Transfer of Resistance to Erysiphe graminis f. sp. tritici from Khapli Emmer and Yuma Durum to Hexaploid Wheat¹

‘Khapli’ emmer is resistant to those cultures of Erysiphe graminis f. sp. tritici with which it has been inoculated. ‘Yuma’ durum, which had Khapli as one parent, is resistant to the same E. graminis tritici cultures. Both Khapli and Yuma are tetraploids.

A dominant gene for resistance to the powdery mildew fungus, herein designated as Pm4, has been transferred from Khapli into the genetic background of the hexaploid wheat variety Chancellor. The new line of Chancellor (Khapli x Chancellor⁸) is homozygous for resistance and appears identical to Chancellor in morphological characters.

A dominant gene for resistance to E. graminis tritici has been transferred from Yuma into Chancellor. Present evidence indicates that this gene is identical with that in Chancellor from Khapli.

The gene from Khapli (Pm4) has been shown to be at a locus different from Pm1, Pm2, and Pm3.

² Research Agronomist, ARS, USDA, Beltsville, Md.

Received for publication April 1, 1966.