Summary
The suitability of large-fruited apple cultivars as alternative donors of powdery mildew resistance to the crabapples carrying major gene resistances was assessed. Five accessions with varying levels of mildew resistance (‘Dülmener Rosen', ‘Liberty', ‘Sciros', ‘Prima' and ‘Red Delicious') and one susceptible cultivar (‘Cox's Orange Pippin') were mated in a partial diallel design, and sub-sets of each seedling family were evaluated for three years at three New Zealand sites (Havelock North, Riwaka and Clyde) with different climatic conditions. There was a high correlation among the powdery mildew susceptibility scores of the individual seedlings over the three years, but disease levels varied among sites, with those at Clyde being the highest. All accessions with some resistance were found to confer additive resistance to their progenies to varying degrees depending on the climatic conditions of the sites, but findings suggest that progeny selection at Clyde will be sufficient for breeding purposes. The performance of the cultivar itself was not necessarily a good predictor of the level of resistance conferred to its progenies. The mostly negative genetic correlations between powdery mildew scores and fruit quality attributes suggest that selecting for powdery mildew resistance and desirable fruit quality traits may not be difficult. However, a larger number of families may be needed for more precise estimates of the genetic correlations to strengthen confidence in this conclusion.
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Bus, V.G.M., Ranatunga, C., Alspach, P.A. et al. A partial diallel study of powdery mildew resistance in six apple cultivars under three growing conditions with different disease pressures. Euphytica 148, 235–242 (2006). https://doi.org/10.1007/s10681-005-9014-2
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DOI: https://doi.org/10.1007/s10681-005-9014-2