Control of Aedes aegypti (Diptera: Culicidae) by means of biofilm-forming actinobacteria.
Actinobacteria are a group of widely known microorganisms used in the synthesis of insecticidal bioactive compounds. Nevertheless, over-exploitation of Streptomyces-derived metabolites has led to explore new bioactive molecules based on non-streptomycetes actinobacteria in order to minimize the development of insecticide resistance in Aedes aegypti. In accordance with to the use of eco-friendly bioagents, in this study biofilm-forming actinobacteria were characterized on the basis of assessment their growth dynamics, larvicidal mortality and sublethal effects. Actinobacteria identification, biofilm growth and larvicidal bioactivities were performed by employing bacterial cultures, photomicrograph-based image analysis and bioassays. Results indicated that bacterial morphotypes belong to Pseudonocardiaceae (PsA1TA) and Corynebacteriaceae (CoA2CA), which showed a distinctly substrate-dependent growth. PsA1TA microcolonies were randomly distributed on abdominal and thoracic membranous epicuticle. Afterwards, the thickness of mono- and bi-layered biofilms were increased fourfold the larval thoracoabdominal width (infectious breadth, 1010 µm - 1036 µm). In contrast, cephalic and anal sclerotized structures were radially encased by CoA2CA biofilms and increased threefold the size of both structures (infectious breadth, 1820 - 2030 µm y 1650 - 1860 µm, respectively). Although biofilms caused dissimilar mortality rates on the four larval instars, PsA1TA exerted highest larvicidal activity and virulence on second instar larvae (58 %-96 hours, LT50: 3.4 days) y CoA2CA on fourth instar larvae (85 %-96 hours, LT50: 2.5 days). CoA2CA also induced incomplete release of pharate individuals as well as buckled protruding tarsi in newly emergent adults, whilst larval cadavers were overwhelmingly encased within massive biofilm aggregates. Biofilm-forming actinobacteria performed biolarvicidal activity and sublethal responses in A. aegypti.
Main Authors: | , |
---|---|
Format: | Digital revista |
Language: | spa |
Published: |
Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias - Departamento de Biología
2021
|
Online Access: | https://revistas.unal.edu.co/index.php/actabiol/article/view/86966 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
oai:www.revistas.unal.edu.co:article-86966 |
---|---|
record_format |
ojs |
institution |
UNAL |
collection |
OJS |
country |
Colombia |
countrycode |
CO |
component |
Revista |
access |
En linea |
databasecode |
rev-actabol |
tag |
revista |
region |
America del Sur |
libraryname |
Sistema Nacional de Bibliotecas de la UNAL |
language |
spa |
format |
Digital |
author |
Bobadilla Alvarez, Miguel Constante Palomino Cadenas, Edwin Julio |
spellingShingle |
Bobadilla Alvarez, Miguel Constante Palomino Cadenas, Edwin Julio Control of Aedes aegypti (Diptera: Culicidae) by means of biofilm-forming actinobacteria. |
author_facet |
Bobadilla Alvarez, Miguel Constante Palomino Cadenas, Edwin Julio |
author_sort |
Bobadilla Alvarez, Miguel Constante |
title |
Control of Aedes aegypti (Diptera: Culicidae) by means of biofilm-forming actinobacteria. |
title_short |
Control of Aedes aegypti (Diptera: Culicidae) by means of biofilm-forming actinobacteria. |
title_full |
Control of Aedes aegypti (Diptera: Culicidae) by means of biofilm-forming actinobacteria. |
title_fullStr |
Control of Aedes aegypti (Diptera: Culicidae) by means of biofilm-forming actinobacteria. |
title_full_unstemmed |
Control of Aedes aegypti (Diptera: Culicidae) by means of biofilm-forming actinobacteria. |
title_sort |
control of aedes aegypti (diptera: culicidae) by means of biofilm-forming actinobacteria. |
description |
Actinobacteria are a group of widely known microorganisms used in the synthesis of insecticidal bioactive compounds. Nevertheless, over-exploitation of Streptomyces-derived metabolites has led to explore new bioactive molecules based on non-streptomycetes actinobacteria in order to minimize the development of insecticide resistance in Aedes aegypti. In accordance with to the use of eco-friendly bioagents, in this study biofilm-forming actinobacteria were characterized on the basis of assessment their growth dynamics, larvicidal mortality and sublethal effects. Actinobacteria identification, biofilm growth and larvicidal bioactivities were performed by employing bacterial cultures, photomicrograph-based image analysis and bioassays. Results indicated that bacterial morphotypes belong to Pseudonocardiaceae (PsA1TA) and Corynebacteriaceae (CoA2CA), which showed a distinctly substrate-dependent growth. PsA1TA microcolonies were randomly distributed on abdominal and thoracic membranous epicuticle. Afterwards, the thickness of mono- and bi-layered biofilms were increased fourfold the larval thoracoabdominal width (infectious breadth, 1010 µm - 1036 µm). In contrast, cephalic and anal sclerotized structures were radially encased by CoA2CA biofilms and increased threefold the size of both structures (infectious breadth, 1820 - 2030 µm y 1650 - 1860 µm, respectively). Although biofilms caused dissimilar mortality rates on the four larval instars, PsA1TA exerted highest larvicidal activity and virulence on second instar larvae (58 %-96 hours, LT50: 3.4 days) y CoA2CA on fourth instar larvae (85 %-96 hours, LT50: 2.5 days). CoA2CA also induced incomplete release of pharate individuals as well as buckled protruding tarsi in newly emergent adults, whilst larval cadavers were overwhelmingly encased within massive biofilm aggregates. Biofilm-forming actinobacteria performed biolarvicidal activity and sublethal responses in A. aegypti. |
publisher |
Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias - Departamento de Biología |
publishDate |
2021 |
url |
https://revistas.unal.edu.co/index.php/actabiol/article/view/86966 |
work_keys_str_mv |
AT bobadillaalvarezmiguelconstante controlofaedesaegyptidipteraculicidaebymeansofbiofilmformingactinobacteria AT palominocadenasedwinjulio controlofaedesaegyptidipteraculicidaebymeansofbiofilmformingactinobacteria AT bobadillaalvarezmiguelconstante controldeaedesaegyptidipteraculicidaemedianteactinobacteriasformadorasdebiopeliculas AT palominocadenasedwinjulio controldeaedesaegyptidipteraculicidaemedianteactinobacteriasformadorasdebiopeliculas |
_version_ |
1755914072310677504 |
spelling |
oai:www.revistas.unal.edu.co:article-869662021-09-21T15:28:03Z Control of Aedes aegypti (Diptera: Culicidae) by means of biofilm-forming actinobacteria. CONTROL DE Aedes aegypti (DIPTERA: CULICIDAE) MEDIANTE ACTINOBACTERIAS FORMADORAS DE BIOPELÍCULAS. Bobadilla Alvarez, Miguel Constante Palomino Cadenas, Edwin Julio Bacterias entomopatógenicas agentes de control biológico insecticidas microbianos fiebre del dengue mosquitos vectores Entomopathogenic bacteria biological control agents microbial insecticides Dengue Fever mosquito vectors Actinobacteria are a group of widely known microorganisms used in the synthesis of insecticidal bioactive compounds. Nevertheless, over-exploitation of Streptomyces-derived metabolites has led to explore new bioactive molecules based on non-streptomycetes actinobacteria in order to minimize the development of insecticide resistance in Aedes aegypti. In accordance with to the use of eco-friendly bioagents, in this study biofilm-forming actinobacteria were characterized on the basis of assessment their growth dynamics, larvicidal mortality and sublethal effects. Actinobacteria identification, biofilm growth and larvicidal bioactivities were performed by employing bacterial cultures, photomicrograph-based image analysis and bioassays. Results indicated that bacterial morphotypes belong to Pseudonocardiaceae (PsA1TA) and Corynebacteriaceae (CoA2CA), which showed a distinctly substrate-dependent growth. PsA1TA microcolonies were randomly distributed on abdominal and thoracic membranous epicuticle. Afterwards, the thickness of mono- and bi-layered biofilms were increased fourfold the larval thoracoabdominal width (infectious breadth, 1010 µm - 1036 µm). In contrast, cephalic and anal sclerotized structures were radially encased by CoA2CA biofilms and increased threefold the size of both structures (infectious breadth, 1820 - 2030 µm y 1650 - 1860 µm, respectively). Although biofilms caused dissimilar mortality rates on the four larval instars, PsA1TA exerted highest larvicidal activity and virulence on second instar larvae (58 %-96 hours, LT50: 3.4 days) y CoA2CA on fourth instar larvae (85 %-96 hours, LT50: 2.5 days). CoA2CA also induced incomplete release of pharate individuals as well as buckled protruding tarsi in newly emergent adults, whilst larval cadavers were overwhelmingly encased within massive biofilm aggregates. Biofilm-forming actinobacteria performed biolarvicidal activity and sublethal responses in A. aegypti. El phylum Actinobacteria incluye miembros productores de compuestos bioinsecticidas. No obstante, la sobreexplotacion de metabolitos derivados de Streptomyces ha conllevado a explorar nuevas moléculas provenientes de bacterias no estreptomicetos para contrarrestar la resistencia a insecticidas químicos en Aedes aegypti. Concordantes con el uso de bioagentes ecológicos, esta investigación caracterizó actinobacterias formadoras de biopelículas con el fin de evaluar su dinámica de crecimiento, actividad larvicida y efectos subletales. La identificación, crecimiento de biopelículas y bioactividades se realizaron por cultivos, análisis de imágenes por fotomicrografía y bioensayos. Los resultados mostraron que las biopelículas pertenecen a Pseudonocardiaceae (PsA1TA) y Corynebacteriaceae (CoA2CA) característicamente dependientes del revestimiento cuticular. PsA1TA coloniza estructuras membranosas de tórax y abdomen con microcolonias aleatoriamente distribuidas que desarrollan a extensas biopelículas mono y biestratificadas, al cubrir cuatro veces la amplitud toracoabdominal (envergadura infectiva entre 1010 µm a 1036 µm). En contraste, CoA2CA envuelve radialmente estructuras esclerotizadas cefálica y anal al triplicar la amplitud de tales órganos (1820 a 2030 µm y 1650 a 1860 µm, respectivamente). Las biopelículas ejercieron mortalidad diferenciada a todos los estadios larvales, no obstante, PsA1TA resultó más mortal y virulento en el segundo estadio larval (58 %-96 horas, TL50: 3,4 días), mientras que CoA2CA lo fue en el cuarto estadio larval (85 %-96 horas, TL50: 2,5 días). CoA2CA indujo emergencia incompleta de adultos farados y despliegue de tarsos curvos en emergentes, además de revestir con robustas biopelículas cadáveres larvarios. Las biopelículas actinobacterianas revelaron ejercer función larvicida y respuestas subletales en A. aegypti. Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias - Departamento de Biología 2021-05-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.unal.edu.co/index.php/actabiol/article/view/86966 10.15446/abc.v26n3.86966 Acta Biológica Colombiana; Vol. 26 No. 3 (2021); 423 - 438 Acta Biológica Colombiana; Vol. 26 Núm. 3 (2021); 423 - 438 1900-1649 0120-548X spa https://revistas.unal.edu.co/index.php/actabiol/article/view/86966/79808 Derechos de autor 2021 Acta Biológica Colombiana https://creativecommons.org/licenses/by-nc-sa/4.0 |