Evidence that resistance to potato leafroll virus accumulation in tetraploidsolarium tuberosum L. is controlled by one or few major genes that are not complementary |
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Authors: | Ruth M. Solomon-Blackburn Hugh Barker John E. Bradshaw Walter De Jong |
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Affiliation: | (1) Scottish Crop Research Institute, Invergowrie, DD2 5DA Dundee, Scotland, UK;(2) Present address: Department of Plant Breeding, Cornell University, 252 Emerson Hall, 14853 Ithaca, NY, USA |
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Abstract: | Summary Previous investigations into the inheritance of resistance to accumulation of potato leafroll virus indicated a dominant major-gene effect, but the segregation ratios in progenies of crosses were a closer fit to a model involving two complementary genes (both required for resistance and one present in the susceptible parent cultivar, Maris Piper) than to a single gene model. In this study, we tested the complementary gene hypothesis by backcrossing susceptible segregants from one of these progenies to their susceptible parent, Maris Piper. No resistant segregants were found in the five backcross progenies examined, so the complementary gene hypothesis was not supported. There was significant variation between susceptible progeny-members in these backcrosses. The progeny of another, highly resistant parent clone, G. 8107(1), selfed, was also examined: all members were resistant. Whilst there is evidently a dominant major-gene effect involved, this is not the whole picture and there are other unidentified genetic effects. |
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Keywords: | PLRV virus resistance luteovirus potato breeding genetics inheritance virus concentration ELISA |
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