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Growth of Manduca sexta on wounded tomato plants: role of induced proteinase inhibitors

The effects of plant age and growing conditions on the wound‐induced responses of tomatoes (Lycopersicon esculentum Mill) was studied. The impact of these variables on the suitability of tomato foliage as food was assessed both by growth rates of neonate Manduca sexta Johannson larvae and by radiometric assay for proteinase inhibitor concentration. Plant quality (as assessed by M. sexta growth rates) was decreased by wounding regardless of plant age or environmental conditions at the time of wounding. The decrease in quality was not necessarily associated with increased concentrations of proteinase inhibitor. When tested directly, high concentrations of proteinase inhibitor did not affect larval growth rates. Induction of foliar proteinase inhibitors in response to wounding was found to peak while the plants were young and decrease as the plants matured.