Abstract
SummaryReactions to two subgroup I isolates (Fny‐CMV and Pf‐CMV) and two subgroup II isolates (A9‐CMV and LS‐CMV) of cucumber mosaic virus (CMV) were studied in three non tuber‐bearing wild potato species (Solanum spp.) of the series Etuberosa, and in two tuber‐bearing interspecific potato hybrids and four potato cultivars using graft‐inoculation. Three classes of phenotypic reactions (susceptible, hypersensitive, extreme resistance) were observed in the tuber‐bearing genotypes. Susceptible genotypes developed mosaic or severe mosaic with leaf malformation and had high CMV titres. Hypersensitive genotypes developed either top necrosis or vein necrosis and/or necrotic spots on apical leaves, and had low CMV titres. Extremely resistant genotypes had no symptoms and no CMV was detected. The hybrid 87HW13.7 (S. tuberosum×S. multidissectum) developed top necrosis specific to infection with Fny‐CMV. The hybrid ‘A6’ (S. demissum×S. tuberosum cv. Aquila) was hypersensitive to all CMV isolates tested. Extreme resistance was not functional against all CMV isolates. Neither hypersensitivity nor extreme resistance were related to the CMV subgroup.
Published Version
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