Correlation between resistance to late blight in foliage and tubers in potato clones from parents of contrasting resistance |
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| Authors: | Helen E Stewart J E Bradshaw R L Wastie |
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| Institution: | (1) Scottish Crop Research Institute, Invergowie, DD2 5DA Dundee, Scotland, UK |
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| Abstract: | Summary The relationship between resistance to late blight in foliage and tuber was examined on 50 clones of each of five progenies
from crosses where one parent was resistant in both foliage and tuber and the other susceptible. Foliage resistance was assessed
in a field trial and tuber resistance in a laboratory test on glasshouse-grown tubers. The genetical and environmental components
of variance and the phenotypic and genetical correlations between foliage and tuber blight scores were determined for each
progeny. Foliage and tuber resistance were correlated, indicating either that both are determined by the same genes or by
different linked genes.
The environmental component of variation was greater for tuber blight than foliage blight. We suggest that the most effective
way of selecting for resistance to both aspects of the disease in a breeding programme is to select those resistant in the
foliage and then screen them for tuber resistance. |
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| Keywords: | Phytophthora infestans Solanum tuberosum L |
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