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Pathogenesis-related and ethylene biosynthesis gene expression in leaves of wild-type and Nr mutant tomato plants inoculated with X. campestris pv. vesicatoria. Four-week-old plants were inoculated with virulent and avirulent strains of the pathogen. RNA levels were determined by RNA gel-blot analysis. Plants are wild type unless otherwise indicated. C, Control; V, virulent; A, avirulent.
