Abstract
Commercial field use of Oxycom TM is correlated with improved plant performance in diverse crops. Oxycom TM conferred disease resistance to Pseudomonas syringae pv. tabaci ( Pst) in tobacco. Symptoms were reduced and bacterial multiplication was inhibited in leaves pretreated with Oxycom TM in comparison to the levels in leaves treated with water. Oxycom TM treatment enhanced the accumulation of PR-1 protein occurring after challenge by Pst. Oxycom TM-treated plants showed greater accumulations of transcripts from the defence genes PR-1a, PR-1g and PR-3a than plants treated with salicylic acid (SA). Oxycom TM treatment caused rapid phosphorylation of a 48 kDa protein with MAP kinase activity. Phosphorylation of the same protein was caused by SA treatment of leaves and suspension cultured tobacco cells. Thisprotein was recognized by a SIPK-specific antibody. These results suggest to us that Oxycom TM stimulates expression of a broad range of defence genes in plants, including those connected to the SA-activated MAPK pathway.
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