CHROMOSOMAL LOCATION OF GENES FOR RESISTANCE TO PUCCINIA-STRIIFORMIS IN WINTER-WHEAT CULTIVARS HEINES-VII, CLEMENT, MORO, TYEE, IKES, AND DAWS

The winter wheat (Triticum aestivum) cultivars Heines VII, Clement, Moro, See, Tres, and Daws have been reported to have stripe rust resistant genes Yr2 and YrHVII, Yr9 and YrCle, Yr10 and YrMor, YrTye, YrTr1 and YrTr2, and YrDa1 and YrDa2, respectively. To confirm the existence of the genes and determine their chromosomal location, the cultivars were crossed with the seedling susceptible cultivar Chinese Spring and a set of 21 Chinese Spring aneuploids. Monosomic F-1 plants were allowed to self-pollinate to produce F-2 seed. Seedlings of F-2 plants and their parents were inoculated with selected North American races of Puccinia striiformis. The results confirmed that Yr2 is on chromosome 7B and Yr9 and Yr10 are on chromosome 1B, and showed the tentative location of the following genes: YrHVII on chromosome 4A, YrCle and YrMor on chromosome 4B, YrTye and YrTr1 on chromosome 6D, YrTr2 on chromosome 3A, YrDa1 on chromosome 1A, and YrDa2 on chromosome 5D.