Abstract
The wheat-rye translocation 1DL.1RS has been used to introduce stem rust disease resistance associated with the 1RS chromosome, however, cultivars carrying this translocation exhibit deleterious enduse quality. The aim of the experiment was to scre en and isolate additional wheat-rye recombinants, i n order to eliminate or reduce these deleterious effects of the rye chromosome 1RS when transferred to wheat. Besides their potential use in wheat improvement, a series of new wheat-rye recombinants could find application in mapping activities with other genes. Using the presence of the SEC-1 marker as an indica tion of the 1RS chromosome segment, several suspected recombinants were isolated. The frequenc y of recovery of suspected recombinants of phenotyp es “TRI-D1 + GLI-D1 - SEC-1 + ” and “TRI-D1 - GLI-D1 + SEC-1 + ” ranged from 0.6 to 6 % in families 1 to 3. However, family 4 showed a much higher than expected frequency of these suspected recombinant chromosomes (24.4%). A model was proposed to explain the nature of Family 4 based on homozygosity for the 1DL.1RS translocation and the presence of two r ecombinants chromosomes involving the short arm of group 1 chromosomes.