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Lipoxygenase (LOX) mRNA, enzyme protein, and enzyme activity were found to be induced in leaves of tomato (Lycopersicon esculentum Mill. cv Moneymaker) on inoculation with plant pathogenic bacteria. The rate of enzyme activity with linoleic or linolenic acid as substrate was approximately 10 times greater than that with arachidonic acid. Optimum activity was at pH 7.0. In the incompatible interaction, which was associated with a hypersensitive reaction (HR), a single band with relative molecular weight approximately 100,000 was revealed by probing western blots of enzyme extracts with antiserum raised against a pea lipoxygenase. Changes in the intensity of this band reflected the changes observed in LOX enzyme activity after bacterial inoculations. In the hypersensitive reaction, i.e. after inoculation with Pseudomonas syringae pv syringae, LOX mRNA was induced by 3 hours and enzyme activity began to increase between 6 and 12 hours and had reached maximum levels by 24 to 48 hours. In tomato leaves inoculated with P. syringae pv tomato (compatible interaction), LOX mRNA was induced later and enzyme activity changed only marginally in the first 24 hours, then increased steadily up to 72 hours, reaching the levels seen in the HR.

A Lipoxygenase from Leaves of Tomato (Lycopersicon esculentum Mill.) Is Induced in Response to Plant Pathogenic Pseudomonads