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Breeding for disease - resistance in potatoes



Breeding for disease - resistance in potatoes



Empire Jour Exptl Agric 17(66): 116-124



Discusses factors contributing towards disease resistance in potatoes from the plant breeding aspect. The aggregate effect of the numerous heritable characters controlling resistance is typical of quantitative inheritance but if one factor should predominate in its contribution towards that resistance, it may be studied separately and utilized in constructive breeding work. A character of this type is the hypersensitive reaction to infection whereby the infected plant responds with local necrosis resulting in the death of the parasite. Such necrotic responses are characteristic of certain potatoes when subjected to infection with the wart-disease fungus, the blight fungus, or the mosaic viruses A, X and Y, and breeding expts. are designed to utilize these qualities. Progress in attaining results of economic value is limited by the evolutionary powers of the parasites. New biotypes of greater virulence than the common strain may arise to attack vars. previously regarded as resistant, but the frequency with which they appear varies widely between the different organisms. The practical value of resistance may thus depend upon the length of time required for the establishment of a new biotype, i.e., upon the ability of the parasite to mutate or segregate. Factors concerned in the breeding of vars. resistant to wart, blight, mosaic, leafroll and scab are discussed.

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Accession: 024265241

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