Pathogenesis-related protein 1 homologue is an antifungal protein in Wasabia japonica leaves and confers resistance to Botrytis cinerea in transgenic tobacco

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An antimicrobial protein was purified from leaves of Wasabia japonica L., and designated as WjAMP-2. WjAMP-2 strongly inhibited growth of four phytopathogenic fungi. The deduced amino acid sequence from WjAMP-2 cDNA showed a homology with pathogenesis-related protein 1 (PR-1) from several higher plants. Expression of WjAMP-2 was induced by inoculation with fungal pathogens and with treatments by salicylic acid, but not by methyl jasmonate. Overexpression of WjAMP-2 in tobacco plants conferred resistance against Botrytis cinerea. These results suggest that WjAMP-2 (PR-1) is an antifungal protein with a defensive role against phytopathogenic fungi in wasabi plants.

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