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EnglishPlants have a type of defense that interferes with the digestive system of insects through the expression of different protease inhibitors (PIs). PIs act by inhibiting proteolytic enzymes in the gut of insects, and may even lead them to death. Therefore, studies have been conducted in order to use these compounds as an alternative method in control of phytophagous insects. The Thyrinteina leucoceraea is prague on eucalypts, but does not cause severe damage in leaves of guava, so it is interesting that the defense of this plant is investigated. Thus, this work studied the enzymatic response of the caterpillar T. leucoceraea further concentration of benzamidine PI (PI synthetic of serine proteases) applied to the leaves of guava in order to evaluate the effects of synthetic inhibitor in conjunction with the natural inhibitor produced by these plants. For this investigation, we used three different concentrations of benzamidine, 0.12, 0.25 and 0.5%. It was found that the guava produce IPs in response to defense and that the benzamidine applied on leaves of guava interfere in the activity of serine proteases in the gut of larvae of T. leucoceraea. However, it can also be observed that the caterpillars were adapted to the ingestion of PIs by increasing the activity of cysteine proteases in almost all treatments. portuguesAs plantas tem um tipo de defesa que interfere no sistema digestivo dos insetos atraves da expressao de diferentes inibidores de proteases (IPs). Os IPs agem inibindo enzimas proteoliticas no intestino dos insetos, podendo ate leva-los a morte. Por isso, estudos tem sido realizados visando a utilizacao desses compostos como metodo alternativo no controle de insetos fitofagos. As lagartas de Thyrinteina leucoceraea causam muitos danos em eucaliptais, mas nao conseguem se desenvolver bem em folhas de goiabeira, portanto e interessante que a defesa desta planta seja investigada. Sendo assim, este trabalho estudou a resposta enzimatica da lagarta T. leucoceraea ao aumento da concentracao do IP benzamidina (IP sintetico de serino-proteases) aplicado sobre as folhas de goiabeira, a fim de estudar a acao do inibidor sintetico em conjunto com o inibidor natural produzido por essas plantas. Para tal investigacao, foram utilizadas tres diferentes concentracoes de benzamidina: 0, 12, 0,25 e 0,5%. Verificou-se que as goiabeiras produzem IPs como resposta de defesa e que a benzamidina aplicada nas plantas de goiaba interferiu na atividade das serino-proteases no intestino de lagartas de T. leucoceraea, entretanto, pode-se observar tambem que as lagartas apresentaram adaptacao a ingestao dos IPs atraves do aumento da atividade de cisteino-proteases em quase todos os tratamentos.

RESPOSTA BIOQUÍMICA DE THYRINTEINA LEUCOCERAEA A INIBIDOR DE PROTEASES EM PLANTAS DE GOIABA