HESSIAN FLY-RESISTANCE GENE TRANSFERRED FROM CHROMOSOME 4M(V) OF AEGILOPS VENTRICOSA TO TRITICUM-AESTIVUM

A new Hessian fly (Mayetiola destructor) resistance gene from Aegilops ventricosa and its transfer to hexaploid wheat is described. The 4D(4 M(v)) substitution line H-93-33 derived from the cross [(Triticum turg idum H-l-l x Aegilops ventricosa no. 11) x Triticum aestivum H-10-15] was highly resistant to the Spanish population tested. Resistance seem ed to be inherited as a single dominant factor in the F-2 generation r esulting from a cross of H-93-33 with its susceptible parent (H-10-15) . Resistance in Ae. venticosa no. 10 was located on chromosome 4M(v) u sing M-v wheat/Ae. ventricosa addition lines. The resistance gene tran sferred from Ae. ventricosa no. 11 to H-93-33 (H27) is allelic with re spect to that of Ae. ventricosa no. 10 and is non-allelic with respect to the genes H3 and H6 from Monon and Caldwell respectively. The assi gnment of H27 ene to chromosome 4M(v) is further supported by its link age to a gene encoding isozyme Acph-M(v)1, previously located on chrom osome 4M(v) in the line H-93-33. A new marker from homoeologous chromo some group 4 (Amp-M(v)2) present in H-93-33 and the 4M(v) addition lin e is described.