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F 500-induced TMV resistance does not depend on SA accumulation. Leaf halves of nontransformed (tobacco cv Xanthi nc) and transformed NahG (tobacco cv Xanthi nc [NahG]) plants were infiltrated with water (−; control halves) or with 0.5 mm F 500 (+). One day later, the entire leaves were infected with TMV. Lesion size (±se) was determined 3 d postinfection.
