Oviposition-stimulant and ovicidal activities of Moringa oleifera lectin on Aedes aegypti.

<h4>Background</h4>Natural insecticides against the vector mosquito Aedes aegypti have been the object of research due to their high level of eco-safety. The water-soluble Moringa oleifera lectin (WSMoL) is a larvicidal agent against A. aegypti. This work reports the effects of WSMoL on...

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Autores principales:	Nataly Diniz de Lima Santos, Kézia Santana de Moura, Thiago Henrique Napoleão, Geanne Karla Novais Santos, Luana Cassandra Breitenbach Barroso Coelho, Daniela Maria do Amaral Ferraz Navarro, Patrícia Maria Guedes Paiva
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/15f822e4280c450b8e07de3b8bb41ff5
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spelling	oai:doaj.org-article:15f822e4280c450b8e07de3b8bb41ff52021-11-18T07:06:18ZOviposition-stimulant and ovicidal activities of Moringa oleifera lectin on Aedes aegypti.1932-620310.1371/journal.pone.0044840https://doaj.org/article/15f822e4280c450b8e07de3b8bb41ff52012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22970317/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Natural insecticides against the vector mosquito Aedes aegypti have been the object of research due to their high level of eco-safety. The water-soluble Moringa oleifera lectin (WSMoL) is a larvicidal agent against A. aegypti. This work reports the effects of WSMoL on oviposition and egg hatching of A. aegypti.<h4>Methodology/principal findings</h4>WSMoL crude preparations (seed extract and 0-60 protein fraction), at 0.1 mg/mL protein concentration, did not affect oviposition, while A. aegypti gravid females laid their eggs preferentially (73%) in vessels containing isolated WSMoL (0.1 mg/mL), compared with vessels containing only distilled water (control). Volatile compounds were not detected in WSMoL preparation. The hatchability of fresh eggs deposited in the solutions in the oviposition assay was evaluated. The numbers of hatched larvae in seed extract, 0-60 protein fraction and WSMoL were 45 ± 8.7 %, 20 ± 11 % and 55 ± 7.5 %, respectively, significantly (p<0.05) lower than in controls containing only distilled water (75-95%). Embryos were visualized inside fresh control eggs, but not within eggs that were laid and maintained in WSMoL solution. Ovicidal activity was also assessed using stored A. aegypti eggs. The protein concentrations able to reduce the hatching rate by 50% (EC50) were 0.32, 0.16 and 0.1 mg/mL for seed extract, 0-60 protein fraction and WSMoL, respectively. The absence of hatching of stored eggs treated with WSMoL at 0.3 mg/mL (EC99) after transfer to medium without lectin indicates that embryos within the eggs were killed by WSMoL. The reduction in hatching rate of A. aegypti was not linked to decrease in bacteria population.<h4>Conclusions/significance</h4>WSMoL acted both as a chemical stimulant cue for ovipositing females and ovicidal agent at a given concentration. The oviposition-stimulant and ovicidal activities, combined with the previously reported larvicidal activity, make WSMoL a very interesting candidate in integrated A. aegypti control.Nataly Diniz de Lima SantosKézia Santana de MouraThiago Henrique NapoleãoGeanne Karla Novais SantosLuana Cassandra Breitenbach Barroso CoelhoDaniela Maria do Amaral Ferraz NavarroPatrícia Maria Guedes PaivaPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 9, p e44840 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nataly Diniz de Lima Santos Kézia Santana de Moura Thiago Henrique Napoleão Geanne Karla Novais Santos Luana Cassandra Breitenbach Barroso Coelho Daniela Maria do Amaral Ferraz Navarro Patrícia Maria Guedes Paiva Oviposition-stimulant and ovicidal activities of Moringa oleifera lectin on Aedes aegypti.
description	<h4>Background</h4>Natural insecticides against the vector mosquito Aedes aegypti have been the object of research due to their high level of eco-safety. The water-soluble Moringa oleifera lectin (WSMoL) is a larvicidal agent against A. aegypti. This work reports the effects of WSMoL on oviposition and egg hatching of A. aegypti.<h4>Methodology/principal findings</h4>WSMoL crude preparations (seed extract and 0-60 protein fraction), at 0.1 mg/mL protein concentration, did not affect oviposition, while A. aegypti gravid females laid their eggs preferentially (73%) in vessels containing isolated WSMoL (0.1 mg/mL), compared with vessels containing only distilled water (control). Volatile compounds were not detected in WSMoL preparation. The hatchability of fresh eggs deposited in the solutions in the oviposition assay was evaluated. The numbers of hatched larvae in seed extract, 0-60 protein fraction and WSMoL were 45 ± 8.7 %, 20 ± 11 % and 55 ± 7.5 %, respectively, significantly (p<0.05) lower than in controls containing only distilled water (75-95%). Embryos were visualized inside fresh control eggs, but not within eggs that were laid and maintained in WSMoL solution. Ovicidal activity was also assessed using stored A. aegypti eggs. The protein concentrations able to reduce the hatching rate by 50% (EC50) were 0.32, 0.16 and 0.1 mg/mL for seed extract, 0-60 protein fraction and WSMoL, respectively. The absence of hatching of stored eggs treated with WSMoL at 0.3 mg/mL (EC99) after transfer to medium without lectin indicates that embryos within the eggs were killed by WSMoL. The reduction in hatching rate of A. aegypti was not linked to decrease in bacteria population.<h4>Conclusions/significance</h4>WSMoL acted both as a chemical stimulant cue for ovipositing females and ovicidal agent at a given concentration. The oviposition-stimulant and ovicidal activities, combined with the previously reported larvicidal activity, make WSMoL a very interesting candidate in integrated A. aegypti control.
format	article
author	Nataly Diniz de Lima Santos Kézia Santana de Moura Thiago Henrique Napoleão Geanne Karla Novais Santos Luana Cassandra Breitenbach Barroso Coelho Daniela Maria do Amaral Ferraz Navarro Patrícia Maria Guedes Paiva
author_facet	Nataly Diniz de Lima Santos Kézia Santana de Moura Thiago Henrique Napoleão Geanne Karla Novais Santos Luana Cassandra Breitenbach Barroso Coelho Daniela Maria do Amaral Ferraz Navarro Patrícia Maria Guedes Paiva
author_sort	Nataly Diniz de Lima Santos
title	Oviposition-stimulant and ovicidal activities of Moringa oleifera lectin on Aedes aegypti.
title_short	Oviposition-stimulant and ovicidal activities of Moringa oleifera lectin on Aedes aegypti.
title_full	Oviposition-stimulant and ovicidal activities of Moringa oleifera lectin on Aedes aegypti.
title_fullStr	Oviposition-stimulant and ovicidal activities of Moringa oleifera lectin on Aedes aegypti.
title_full_unstemmed	Oviposition-stimulant and ovicidal activities of Moringa oleifera lectin on Aedes aegypti.
title_sort	oviposition-stimulant and ovicidal activities of moringa oleifera lectin on aedes aegypti.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/15f822e4280c450b8e07de3b8bb41ff5
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Oviposition-stimulant and ovicidal activities of Moringa oleifera lectin on Aedes aegypti.

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