Abstract
The powdery mildew resistance gene Pm21 comes from a diploid wheat related species, Haynaldia villosa. Two Pm21-carrying small fragment translocation lines, the terminal translocation line NAU418 and the small interstitial translocation line NAU419, have been developed. Both lines are highly resistant to powdery mildew and serve as new genetic resources for improvement of disease resistance. For understanding the transmission rate of the translocation chromosomes through male and female gametes and the genetic stabilities in different wheat genetic backgrounds, the two translocations were crossed to 12 com- mon wheat varieties from different wheat growing areas of China. The F1 hybrids were then backcrossed as reciprocally. Chro- mosome configurations of the obtained F1s were analyzed by fluorescence in situ hybridization (FISH) of the PMC at MI. It was found that the translocation chromosomes formed rod bivalents with their corresponding wheat chromosomes. Test crosses showed that the translocation chromosomes T1AS1AL-6VS and T4BS4BL-6VS-4BL could be transmitted to their offspring. The
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