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Interrelationships among Wheat Genes for Resistance to Hessian Fly

Stebbins, Nancy B., Patterson, F. L., Gallun, R. L.
Crop science 1980 v.20 no.2 pp. 177-180
Mayetiola destructor, Triticum aestivum, Triticum turgidum subsp. durum, backcrossing, biotypes, chromosomes, dominant genes, durum wheat, gene order, hexaploidy, inheritance (genetics), tetraploidy
The interrelationships among genes for resistance in six cultlvars and one llne of hexaplold wheat (Triticum aestivum L. aestivum group) of three biotypes of Hessian fly (Mayetiola destructor Say) were analyzed using reactions of F, lines or backcrosses plant progenies at 20 C. Chi-square goodness-of-fit tests were used to test genetic hypotheses. Recombination frequencies and standard errots were determined using the maximum fikelihood method. Three hexaploid wheats, Purdue 4835A4-6, ‘Knox 62’, and ‘Lathrop’ have resistances to biotypes A and B of Hessian fly derived from PI 94587 tetraploid durum wheat (T. durum L. durum group). The single dominant gene pair H₆-H₆, which also confers resistance in Knox 62 and Purdue 4835A4-6, governs Lathrop's resistance. Pur Purdue selection 822-34 has a single dominant gene pair derived from ‘Elva’ (T. turgidum L. durum group) for resistance to biotype D of Hessian fly. The resistance was found to be inherited independently of the H₅H₅ gene pair in ‘Abe’. The new gene for resistance was assigned the symbol H₉ H₉ was linked to H₃ (on chromosome 5A) with a recombination frequency of 0.155±0.048. This places H₃, H₆, and H₉ on chromosome 5A but the gene order was not established. The genotypes of ‘Arthur 71’ and Abe were found to be H₃H₃ H₅H₅. We established that H₅ is independent of the linkage block containing H₃, H₆, and H₉.