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The inheritance of mildew resistance in progenies of the cultivated apple

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Abstract

  1. 1.

    Resistance to Apple Mildew (Podosphaera leucotricha) is shown to be inherited quantitatively and apple varieties vary in the resistance contribution which they pass on to their progeny.

  2. 2.

    The mean relative resistance values of progenies of given varieties correspond closely irrespective of whether they are the result of selfing or outcrossing.

  3. 3.

    It is shown that resistance in progenies is correlated with the resistance reactions of the parents.

  4. 4.

    A statistical analysis of the data, using methods applicable to an incomplete diallel cross, has enabled the contribution of each parent to resistance to mildew of its progenies to be calculated. Of the cultivated varieties, Beauty of Bath and Lord Lambourne gave the highest contributions and Merton Russet and Late Orange the lowest. This method of analysis allows the estimation of the mean resistance of the progenies of varietal crosses in the absence of complete observational records.

Samenvatting

Resistentie tegen meeldauw erft kwantitatief over; de invloed van ouders op de resistentie der nakomelingschappen is uiteenlopend.

De gemiddelde relatieve resistentiewaarden van de nakomelingschappen van bepaalde rassen vertonen grote overeenkomst, onverschillig of deze het resultaat van zelfbevruchting of van kruising zijn.

Aangetoond werd dat de resistentie van de nakomelingschappen correlatie vertoont met de resistentie van de ouders.

Een statistische bewerking van de gegevens, waarbij de methoden van een onvolledige diallele kruising werden toegepast, maakte het mogelijk de invloed van elk der ouders op de meeldauwresistentie van de nakomelingschap te berekenen.

De appelrassen Beauty of Bath en Lord Lambourne brachten de resistentie in de hoogste mate op hun nakomelingschap over. Merton Russet en Late Orange in de geringste mate.

Deze methode van bewerking biedt de mogelijkheid de gemiddelde resistentie van de kruisingsnakomelingschappen te schatten indien volledige waarnemingen ontbreken.

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References

  1. Golmick, F., Beobachtungen über den Apfelmehltau. Nachr. Bl. Dtsch. Pfl.Sch. Dienst. 4 (1950): 205–214.

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  2. Harland, S. C. and King, E., Inheritance of mildew resistance in Fragaria with special reference to cytoplasmic effects. Heredity 11 (1957): 257 (Abstract).

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  3. Schander, H., Untersuchungen zur Entwicklung von Frühselektionsmethoden für die Apfelzüchtung. II. Über Frühselektion auf Resistenz gegen Apfelmehltau (Podosphaera leucotricha Salm.), über die Anfälligkeit von Apfelsorten und über die Vererbung der Anfälligkeit. Züchter 28 (1958): 105–132.

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Authors and Affiliations

  1. John Innes Horticultural Institution, Bayfordbury, Hertford, Herts

    A. G. Brown

Authors
  1. A. G. Brown
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Brown, A.G. The inheritance of mildew resistance in progenies of the cultivated apple. Euphytica 8, 81–88 (1959). https://doi.org/10.1007/BF00022092

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  • DOI: https://doi.org/10.1007/BF00022092

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