Inheritance of Powdery Mildew Resistance in Wheat Line IL72-2219-1

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Abstract
Experiments were conducted to study the inheritance of powdery mildew (Pm) (Erysiphe graminis f. sp. tritici) resistance in an experimental wheat (T. aestivum) line IL72-2219-1, which was crossed with the Pm-susceptible cultivars Hart and Blueboy to obtain F2 and testcross progeny. When segregating generations were tested with a single powdery mildew (144), a qualitative single dominant gene inheritance pattern was observed. Nonsegregating wheat host lines (including IL72-2219-1, ''Hart'', ''Blueboy'', Va66-54-10 and ''Arthur'') were tested for reaction to 6 differential mildew isolates. The reactions of each line to the 6 isolates were then compared with reactions of near-isogenic wheat lines with known genes for resistance. Both IL72-2219-1 and its seed parent, Va66-54-10, apparently contain gene Pm3a.

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