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Induced resistance to viral infection and soluble protein alterations in cucumber cucumis sativus and cowpea vigna sinensis plants



Induced resistance to viral infection and soluble protein alterations in cucumber cucumis sativus and cowpea vigna sinensis plants



Phytopathologische Zeitschrift 107(1): 57-69



The formation of tobacco necrosis virus-elicited local lesions led to a localized resistance in cowpea leaves and cucumber cotyledons with an acquired systemic resistance induced in cubumber 1st leaves, following homologous challenge. The resistance was against symptom expression rather than against virus multiplication. A similar resistance in both species could be elicited by spraying healthy tissue with polyacrylic acid 4 days before inoculation or osmotically-stressing cowpea leaves 24 h before inoculation. Virus-elicited necrosis resulted in reproducible alterations to the soluble protein profile of both species. Apparently novel host proteins, termed the .alpha. and .beta. fractions in cowpea leaves and the .gamma. fraction in cucumber tissue were induced during necrosis, and quantitatively reduced by concomitant actinomycin D treatment. Tissue of both species showing resistance contained either small amounts or more often none of the apparently novel fractions and any direct involvement in resistance was unlikely. The tissue exhibiting a degree of resistance to virus inoculation probably had an altered susceptibility to infection. This altered suseptibility appeared engendered by treatments (e.g. PA spraying, osmotic stressing or previous inoculations on the same plants) that reduce the turgidity of the cells to be challenged.

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