TRANSFER OF HESSIAN FLY RESISTANCE FROM CHAUPON RYE TO HEXAPLOID WHEAT VIA A 2BS/2RL WHEAT-RYE CHROMOSOME-TRANSLOCATION

Four wheat-rye lines derived from a cross between hexaploid wheat 'ND 7532' and 'Chaupon' rye were homogeneous for resistance to biotype L of the Hessian fly, Mayetiola destructor. Because the wheat parent was susceptible and the rye parent was resistant to larval feeding, resistance was derived from rye. Resistance of 'Chaupon' and the wheat-rye lines was expressed as larval antibiosis. First-instar larvae died after feeding on plants. Chromosomal analyses using C- and N-banding techniques were performed on plants of each line to identify genomes and structural changes of chromosomes. Results showed that two of the resistant lines were chromosome addition lines carrying either the complete rye chromosome, 2R, or only the long arm of 2R. The other two resistant lines were identified as being 2BS/ 2RL wheat-rye translocation lines. It was concluded, therefore, that the long arm of rye chromosome 2R carries a gene or gene complex that conditions antibiosis to Hessian fly larvae and, in the 2BS/2RL translocation lines, this rye chromatin is cytologically stable and can be used directly in wheat breeding programs. © 1990 Springer-Verlag.