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Genetics of virulence in the Hessian fly to resistance gene H13 in wheat

Zantoko, L., Shukle, R.H.
Journal of heredity 1997 v.88 no.2 pp. 120-123
Mayetiola destructor, alleles, backcrossing, color, cultivars, eyes, genetic analysis, genetic markers, insect resistance, loci, males, phenotype, resistance genes, sex chromosomes, virulence, wheat
The present work was undertaken to determine if virulence in the Hessian fly operates on a gene-for-gene basis with respect to resistance gene H13, an undeployed gene for resistance being incorporated into wheat cultivars for Hessian fly protection. Results revealed virulence was controlled by a single recessive, sex-linked gene (virulence to H13, vrH13). Additionally, genetic analysis of virulent/avirulent phenotypes confirmed previous observations that males express only maternally derived sex chromosomes in the soma. Segregation of white and dark eye color in H13 virulent F2 backcross individuals showed a significant (P < .001) deviation from the expected 1:1 phenotypic ratio, which indicated the locus controlling the white-eye trait was linked to the locus controlling virulence to H13. Recombination frequency between the white allele and vrH13 was 24.3 +/- 0.02%. Application of knowledge concerning the genetic control of virulence in the Hessian fly to resistance in wheat is discussed with respect to the pyramiding of resistance genes in wheat, and use of the white-eye phenotype to facilitate identifying molecular markers linked to H13 virulence is described.