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Early determination of genotypes for apple scab resistance by forced flowering of test cross progenies

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Summary

Apple selections with different major genes for resistance to apple scab (Venturia inaequalis) derived from Malus floribunda and M. pumila were crossed with each other. The progenies were screened as young seedlings for their reaction to V. inaequalis race 1. A gene for resistance from M. pumila, causing stellate necrotic (SN) lesions, was epistatic to a second gene for resistance from M. floribunda, causing irregular chlorotic (Chl) lesions. Although in most cases SN, Chl and susceptible phenotypes were clearly distinct, occasionally reactions were difficult to characterize or varied from one inoculation to another. Selected seedlings showing resistant or susceptible reactions were forced to flower in 16–20 months in the greenhouse and test crossed with susceptible cultivars. Test cross seedlings were screened for scab reaction. The presence of both genes for resistance in a resistant plant was indicated by presence of both Chl and SN resistant phenotypes in the test cross progeny. Chi-square analysis of four large progenies produced a good fit to the expected ratio. The use of the forced flowering technique to determine scab resistance genotypes in 28 months demonstrated its value in breeding apples with multiple disease resistance.

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Authors and Affiliations

  1. Department of Plant Pathology, New York State Agricultural Experiment Station, 14456, Geneva, NY, USA

    Herb S. Aldwinckle, H. L. Gustafson & R. C. Lamb

  2. Department of Pomology and Viticulture, New York State Agricultural Experiment Station, 14456, Geneva, NY, USA

    Herb S. Aldwinckle, H. L. Gustafson & R. C. Lamb

Authors
  1. Herb S. Aldwinckle
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  2. H. L. Gustafson
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  3. R. C. Lamb
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Aldwinckle, H.S., Gustafson, H.L. & Lamb, R.C. Early determination of genotypes for apple scab resistance by forced flowering of test cross progenies. Euphytica 25, 185–191 (1976). https://doi.org/10.1007/BF00041544

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  • DOI: https://doi.org/10.1007/BF00041544

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