Systemic acquired resistance induced in hypersensitive plants by nonnecrotic localized viral infections
1Department of Plant Pathology, University of Florida, Gainesville, Florida 32611, USA.
Abstract:
Localized symptomless infections of cucumber cotyledons and first foliage leaves by tobacco mosaic virus (TMV) induced systemic acquired resistance in other leaves of the same plants inoculated 2 weeks later with tobacco necrosis virus. Diameters of lesions that developed after the second inoculation were 35% less and lesion numbers were 30% fewer than in control plants not previously inoculated with TMV. Thus, necrosis after the first inoculation was not prerequisite to virus-induced systemic acquired resistance.
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