Abstract
Ethylene emission and the activity of oxidative enzymes were studied in tomato leaves after injury by carmine spider mite (CSM) (Tetranychus cinnabarinus Boisduval) feeding. Based on gas chromatographic data it was found that the feeding of 50 CSM for 3 days on young plants of tomato (Lycopersicon esculentum Mill., cv. Slonka) induced an increase of ethylene production by 40%. Elevated ethylene emission by damaged leaves was accompanied by the enhanced activity of oxidative proteins. Activity of total peroxidase and ascorbate oxidase in damaged leaves was about twice as high as compared to undamaged control leaves. Induction of polyphenol oxidase was less pronounced but highly significant. The results obtained suggest that in injured tomato plant’s early defence responses against CSM are characterized by the action of ethylene on oxidative enzymes.
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