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Title

EFFECT OF A LECTIN EXTRACTED FROM POLYGONUM PERSICARIA L. ON SOME COMPOUNDS INVOLVED IN INTERMEDIARY METABOLISM OF PIERIS BRASSICAE L. (LEP.: PIERIDAE) LARVAE

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 Start Page 17 | End Page 29

Abstract

LECTINs are the proteins with the heterogenous structure that bind to mono- or oligosaccharides of cell surfaces leading to interference in cellular processes or even death. In the current study, effects of the different concentrations (0.5, 1 and 2 mg/ml) of POLYGONUM PERSICARIA L. LECTIN were assessed on the INTERMEDIARY METABOLISM of PIERIS BRASSICAE L. larvae to better understanding of its entomotoxicme chanism. Feeding of the larvae on the POLYGONUM PERSICARIA LECTIN increased activities of aspartate aminotransferase and gamma-glutamyl transferase but the activity of alanine aminotransferase statistically decreased. Activity of aldolase increased in the treated larvae in a dose-dependent manner. Also, activityof acid phosphatase showed no statistical differences between treated and control larvae, but alkalin ephosphatase in the larvae fed on 2 mg/ml of LECTIN had the highest activity in comparison with other treatments. High density lipoprotein in the larvae fed on 2 mg/ml of LECTIN, had the lowest amount but low density lipoprotein showed the highest amount. Among storage macromolecules, glycogen showed nostatistical difference between control and treated larvae but the amounts of protein and trigly ceridestatistically decreased. Results of the current study showed that P. persicaria LECTIN can cause disturbancein INTERMEDIARY METABOLISM of P. brassicae larvae in its highest use dose which may lead lower biological and reproductive efficiencies.

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