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An additional report on the difference in phenotypic expressions between genes, R1 and R4, controlling resistance toPhytophthora infestans in potatoes

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Summary

  1. (1)

    The previously established fact thatTakase's geneRb, internationallyR 4, conferred a weaker resistance than that conferred by geneRa, internationallyR 1, was ascertained withBlack's geneR 4, especially on tubers.

  2. (2)

    It was disclosed by careful examination of necrotic responses thatBlack's geneR 4 is identical withTakase's geneRb, not only in respect to its specificity to races of the fungus but also as concerns inferior reaction.

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Literature cited

  1. BlackW., MastenbroekC., MillsW. R. and PetersonL. C., A proposal for an international nomenclature of races ofPhytophthora infestans and of genes controlling immunity inSolanum demissum derivatives. Euphytica 2 (1953): 173–179.

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  2. TakaseN. and TakakuwaM., Studies on the resistance to late blight in potatoes. II. Field infection of interspecific hybrid potatoes with newly appeared strain ofPhytophthora infestans. Jap. Jour. Breeding 6 (1956): 1–4.

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  3. Takase, N., Studies on the resistance to late blight in potatoes. IV. The difference in phenotypic expressions between genes controlling resistance toPhytophthora infestans in potatoes. Jap. Jour. Breeding 7 (1957) in press.

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Authors and Affiliations

  1. Hokkaido Nat. Agr. Exp. Station, Kotoni, Sapporo, Japan

    Noboru Takase

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  1. Noboru Takase
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Takase, N. An additional report on the difference in phenotypic expressions between genes, R1 and R4, controlling resistance toPhytophthora infestans in potatoes. Euphytica 6, 189–192 (1957). https://doi.org/10.1007/BF00729888

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  • DOI: https://doi.org/10.1007/BF00729888

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