Relationship between Resistance to Hessian Fly and Powdery Mildew in Soft White Spring Wheat PI 4689601
- D. W. Sunderman and
- J. H. Hatchett2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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