Response of Epilachna paenulata to two flavonoids, Pinocembrin and quercetin, in a comparative study

We examined the effects of the flavonoids pinocembrin and quercetin on the feeding behavior, survival, and development of the Cucurbitaceae pest Epilachna paenulata (Coleoptera: Coccinellidae). In no-choice experiments, 48 hr-consumption of Cucurbita maxima Duch. leaves treated with pinocembrin at 1...

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Autores principales: Díaz Napal, Georgina, Defagó, María T., Valladares, Graciela, Palacios, Sara María
Formato: Artículo PeerReviewed
Lenguaje:Español
Publicado: 2010
Materias:
QD Química
Acceso en línea:http://pa.bibdigital.ucc.edu.ar/4983/1/A_D%C3%ADaz%20Napal.pdf
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Producción Académica Universidad Católica de Córdoba (UCCor) de Universidad Católica de Córdoba
id I38-R144-4983
record_format dspace
spelling I38-R144-49832025-11-04T17:53:17Z http://pa.bibdigital.ucc.edu.ar/4983/ Response of Epilachna paenulata to two flavonoids, Pinocembrin and quercetin, in a comparative study Díaz Napal, Georgina Defagó, María T. Valladares, Graciela Palacios, Sara María QD Química We examined the effects of the flavonoids pinocembrin and quercetin on the feeding behavior, survival, and development of the Cucurbitaceae pest Epilachna paenulata (Coleoptera: Coccinellidae). In no-choice experiments, 48 hr-consumption of Cucurbita maxima Duch. leaves treated with pinocembrin at 1, 5, and 50 μg/cm2 was less than one third of that for leaves treated with 0. 1 μg/cm2 of pinocembrin or untreated leaves. Larvae stopped feeding after 9 days of high doses of pinocembrin (5 and 50 μg/cm2), and larval weight and survival were negatively affected by pinocembrin at 1-50 μg/cm2. Delayed mortality in comparison to food-deprived larvae suggests that the mechanism of action for pinocembrin is chronic intoxication, rather than simple starvation from antifeedant effects. In contrast, leaf consumption and larval weight were not significantly affected by quercetin (at 0. 1, 1, 5, and 50 μg/cm2) while mortality rates were only slightly increased. The response of E. paenulata larvae in a choice-test to combinations of pinocembrin at antifeedant doses (5 and 50 μg/cm2) and quercetin at phagostimulant doses (0. 01 and 0. 1 μg/cm2) indicated that the feeding deterrent activity of the former completely overshadowed the stimulant activity of the latter. These results demonstrate the different responses of one insect species to two widely distributed plant flavonoids. Pinocembrin strongly affected survival of E. paenulata while quercetin had only a weak effect without major consequences on the insect life-cycle. 2010-12-31 Artículo PeerReviewed application/pdf spa http://pa.bibdigital.ucc.edu.ar/4983/1/A_D%C3%ADaz%20Napal.pdf Díaz Napal, Georgina ORCID: https://orcid.org/0000-0003-2440-2488 <https://orcid.org/0000-0003-2440-2488>, Defagó, María T., Valladares, Graciela ORCID: https://orcid.org/0000-0001-8857-8306 <https://orcid.org/0000-0001-8857-8306> and Palacios, Sara María (2010) Response of Epilachna paenulata to two flavonoids, Pinocembrin and quercetin, in a comparative study. Journal of Chemical Ecology, 36 (8). pp. 898-904. ISSN 15731561 info:eu-repo/semantics/altIdentifier/doi/10.1007/s10886-010-9823-1
institution Universidad Católica de Córdoba
institution_str I-38
repository_str R-144
collection Producción Académica Universidad Católica de Córdoba (UCCor)
language Español
orig_language_str_mv spa
topic QD Química
spellingShingle QD Química
Díaz Napal, Georgina
Defagó, María T.
Valladares, Graciela
Palacios, Sara María
Response of Epilachna paenulata to two flavonoids, Pinocembrin and quercetin, in a comparative study
topic_facet QD Química
description We examined the effects of the flavonoids pinocembrin and quercetin on the feeding behavior, survival, and development of the Cucurbitaceae pest Epilachna paenulata (Coleoptera: Coccinellidae). In no-choice experiments, 48 hr-consumption of Cucurbita maxima Duch. leaves treated with pinocembrin at 1, 5, and 50 μg/cm2 was less than one third of that for leaves treated with 0. 1 μg/cm2 of pinocembrin or untreated leaves. Larvae stopped feeding after 9 days of high doses of pinocembrin (5 and 50 μg/cm2), and larval weight and survival were negatively affected by pinocembrin at 1-50 μg/cm2. Delayed mortality in comparison to food-deprived larvae suggests that the mechanism of action for pinocembrin is chronic intoxication, rather than simple starvation from antifeedant effects. In contrast, leaf consumption and larval weight were not significantly affected by quercetin (at 0. 1, 1, 5, and 50 μg/cm2) while mortality rates were only slightly increased. The response of E. paenulata larvae in a choice-test to combinations of pinocembrin at antifeedant doses (5 and 50 μg/cm2) and quercetin at phagostimulant doses (0. 01 and 0. 1 μg/cm2) indicated that the feeding deterrent activity of the former completely overshadowed the stimulant activity of the latter. These results demonstrate the different responses of one insect species to two widely distributed plant flavonoids. Pinocembrin strongly affected survival of E. paenulata while quercetin had only a weak effect without major consequences on the insect life-cycle.
format Artículo
PeerReviewed
author Díaz Napal, Georgina
Defagó, María T.
Valladares, Graciela
Palacios, Sara María
author_facet Díaz Napal, Georgina
Defagó, María T.
Valladares, Graciela
Palacios, Sara María
author_sort Díaz Napal, Georgina
title Response of Epilachna paenulata to two flavonoids, Pinocembrin and quercetin, in a comparative study
title_short Response of Epilachna paenulata to two flavonoids, Pinocembrin and quercetin, in a comparative study
title_full Response of Epilachna paenulata to two flavonoids, Pinocembrin and quercetin, in a comparative study
title_fullStr Response of Epilachna paenulata to two flavonoids, Pinocembrin and quercetin, in a comparative study
title_full_unstemmed Response of Epilachna paenulata to two flavonoids, Pinocembrin and quercetin, in a comparative study
title_sort response of epilachna paenulata to two flavonoids, pinocembrin and quercetin, in a comparative study
publishDate 2010
url http://pa.bibdigital.ucc.edu.ar/4983/1/A_D%C3%ADaz%20Napal.pdf
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AT valladaresgraciela responseofepilachnapaenulatatotwoflavonoidspinocembrinandquercetininacomparativestudy
AT palaciossaramaria responseofepilachnapaenulatatotwoflavonoidspinocembrinandquercetininacomparativestudy
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