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vol.28 issue3FIRST RECORD FOR CATHARTUS QUADRICOLLIS AND CALLOSOBRUCHUS MACULATUS CULTURES ATTACKED BY THE MITE PYEMOTES TRITICITRICHOSPILUS DIATRAEAE CHERIAN & MARGABANDHU, 1942 (HYMENOPTERA:EULOPHIDAE), A NEW PARASITOID OF HYPSIPYLA GRANDELLA (ZELLER, 1848) (LEPIDOPTERA: PYRALIDAE) author indexsubject indexarticles search
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Idesia (Arica)

On-line version ISSN 0718-3429

Abstract

SCARDINI MARINHO, Jeanne et al. BIOCHEMICAL RESPONSE OF THYRINTEINA LEUCOCERAEA TO PROTEASES INHIBITOR IN GUAVA PLANTS. Idesia [online]. 2010, vol.28, n.3, pp.101-109. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292010000300013.

Plants 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.

Keywords : Digestion of insects; serine proteases; protease inhibitors; Lepidoptera; Geometridae.

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