Inheritance of resistance to late blight in foliage and tubers of progenies from parents differing in resistance |
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Authors: | Helen E Stewart R L Wastie J E Bradshaw J Brown |
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Institution: | (1) Scottish Crop Research Institute, Invergowrie, DD2 5DA Dundee, Scotland;(2) Present address: 3 Mulberry Court, 18, 94002 Belmont, California, USA |
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Abstract: | Summary TenSolanum tuberosum genotypes differing in resistance to late blight (Phytophthora infestans (Mont.) de Bary) in foliage and tubers were intercrossed to determine the inheritance of disease resistance in their progenies.
Plots of 10–15 clones per progeny were established in each of 2 years and resistance assessed by field or laboratory tests.
The parental genotypes were similarly tested each year.
The parents differed in general combining ability (GCA) for both foliage blight (FB) and tuber blight (TB). The parental and
GCA scores were significantly correlated for both aspects of the disease, but the correlations between foliage and tuber scores
for parents and for GCAs were not significant.
Three parental genotypes were highly resistant in both foliage and tubers, and the genotype with the highest GCA for resistance
to both FB and TB (cv. stirling) is recommended as the best parent. There was no evidence of strong genetic correlation between
both aspects of resistance, and it is suggested that both be selected for in a breeding programme. |
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Keywords: | Phytophthora infestans Solanum tuberosum L progeny test disease screening inheritance general combining ability |
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