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Diallel Analysis of Adult-Plant Resistance to Powdery Mildew in Wheat

Dep. of Crop and Soil Environmental Sciences, Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061

^* Corresponding author.

Adult-plant resistance (APR) to powdery mildew [Blumeria graminis (DC.) E. O. Speer f. sp. tritici Em. Marchal] in wheat (Triticum aestivum L.) has been documented as being more durable than hypersensitive resistance. However, little is known about the inheritance and diversity of this resistance. Combining abilities and gene effects for APR to powdery mildew were studied in a diallel cross involving one susceptible and six APR cultivars. Parents, F₁, and F₂ populations were evaluated in replicated field trials under natural epidemics of powdery mildew. Area under the disease progress curve (AUDPC) was used to measure disease severity over time. Significant differences in AUDPC were observed among parents, F₁ crosses, and F₂ populations. Comparisons of AUDPC values of parents, midparents, and F₁ crosses involving susceptible and APR parents indicated that resistance is partially dominant. Non-additive effects of the resistance genes were also evident from significant contrasts between parents and F₁ crosses. While nonadditive gene effects were involved, additive gene effects were predominant in the inheritance of APR to powdery mildew in the materials evaluated. General combining ability (GCA) and specific combining ability (SCA) for mildew resistance were significant in both F₁ and F₂ generations. GCA was more important than SCA as suggested by large ratios of GCA and SCA variance components [²_g /(²_g + ²₈)] in F₁ (0.75) and F₂ (0.86) generations. The wheat cultivars Maris Huntsman, Massey, and Coker 983 had high negative GCA effects and should be promising parents in breeding programs for enhancement of powdery mildew resistance.

Received for publication September 23, 1993.

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