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  1. Vol. 26 No. 5, p. 1071-1072
     
    Received: Apr 26, 1985
    Published: Sept, 1986


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doi:10.2135/cropsci1986.0011183X002600050047x

Relationship between Resistance to Hessian Fly and Powdery Mildew in Soft White Spring Wheat PI 4689601

  1. D. W. Sunderman and
  2. J. H. Hatchett2

Abstract

Abstract

Tests of F2 and F3 progenies from crosses of near-isogenic spring wheat (Triticum aestivum L.) lines of PI 468960 segregating for reaction to powdery mildew (Erysiphe graminis DC. f. sp. tritici Em. Marchal) and Hessian fly [Mayetiola destructor (Say)] suggested that the Pm3a and H3 genes previously identified as located on chromosomes 1A and 5A, respectively, were linked in repulsion. Crossover values were calculated as 10.5 and 14.3%, by the maximum likelihood and product methods, respectively. Microsporocytes from F1 plants of PI 468960/susceptible showed that a ring of four chromosomes caused the linkage. PI 468960 will be a useful parent in breeding programs where screening for resistance is limited to one pest.

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