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Morphological analysis of the alimentary canal of Plutella xylostella (Linnaeus, 1758) (Lepidoptera: Plutellidae) submitted to microencapsulated formulation of Annona muricata L. (Annonaceae)

This study obtained information about the external and internal morphology of the alimentary canal of the main pest of brassica, Plutella xylostella L. (Lepidoptera: Plutellidae), when it is exposed to a microencapsulated formulation of the seed extract of Annona muricata L. (Annonaceae). The toxici...

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Published in:Ciência rural 2025-01, Vol.55 (3)
Main Authors: Figueiroa, Leonara Evangelista de, Dantas, Priscylla Costa, Valente, Ellen Carine Neves, Araújo, Alice Maria Nascimento, Silva, José Pedro da, Trindade, Roseane Cristina Predes
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description This study obtained information about the external and internal morphology of the alimentary canal of the main pest of brassica, Plutella xylostella L. (Lepidoptera: Plutellidae), when it is exposed to a microencapsulated formulation of the seed extract of Annona muricata L. (Annonaceae). The toxicity of the microencapsulated formulation of the caterpillars fed for 12, 24, and 48 hours plus the control was evaluated to verify and evaluate external and internal morphological changes caused by the extract that may have killed the caterpillars. After the assays, the alimentary canal of the caterpillars was dissected, fixed, dehydrated, blocked, cut, and colored. Then, histological slides were produced and studied under light microscopy and scanning microscopy (SEM). The microencapsulated formulation of A. muricata caused irreversible damage to the alimentary canal of P. xylostella, with disorganization, cell stratification, and modifications in the morphology of the cells considered essential for survival. SEM verified that the peritrophic membrane and the muscular layer remained intact during all the assays. The effects were more severe with more hours of exposure. These results demonstrated that after contact by ingestion, the insect dies due to intoxication and cellular disorganization, inhibiting its ability to continue feeding. RESUMO: O objetivo deste estudo foi obter informações sobre a morfologia externa e interna do canal alimentar da principal praga das brássicas, Plutella xylostella L. (Lepidoptera: Plutellidae), quando exposta a uma formulação microencapsulada do extrato da semente de Annona muricata L. (Annonaceae). A toxicidade da formulação microencapsulada das lagartas alimentadas por 12, 24 e 48 horas mais o controle foi avaliada para verificar alterações morfológicas externas e internas causadas pelo extrato que possam ter causado a morte das lagartas. Após os ensaios, o canal alimentar das lagartas foi dissecado, fixado, desidratado, bloqueado, cortado e colorido. Em seguida, lâminas histológicas foram produzidas e estudadas em microscopia óptica e microscopia de varredura (MEV). A formulação microencapsulada de A. muricata, causou danos irreversíveis ao canal alimentar de P. xylostella, com desorganização, estratificação celular e modificações na morfologia das células consideradas essenciais para a sobrevivência. Na análise por MEV, verificou-se que a membrana peritrófica e a camada muscular permaneceram intactas durante todos os ensaios.
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(Annonaceae)</title><source>SciELO Brazil</source><source>Alma/SFX Local Collection</source><creator>Figueiroa, Leonara Evangelista de ; Dantas, Priscylla Costa ; Valente, Ellen Carine Neves ; Araújo, Alice Maria Nascimento ; Silva, José Pedro da ; Trindade, Roseane Cristina Predes</creator><creatorcontrib>Figueiroa, Leonara Evangelista de ; Dantas, Priscylla Costa ; Valente, Ellen Carine Neves ; Araújo, Alice Maria Nascimento ; Silva, José Pedro da ; Trindade, Roseane Cristina Predes</creatorcontrib><description>This study obtained information about the external and internal morphology of the alimentary canal of the main pest of brassica, Plutella xylostella L. (Lepidoptera: Plutellidae), when it is exposed to a microencapsulated formulation of the seed extract of Annona muricata L. (Annonaceae). The toxicity of the microencapsulated formulation of the caterpillars fed for 12, 24, and 48 hours plus the control was evaluated to verify and evaluate external and internal morphological changes caused by the extract that may have killed the caterpillars. After the assays, the alimentary canal of the caterpillars was dissected, fixed, dehydrated, blocked, cut, and colored. Then, histological slides were produced and studied under light microscopy and scanning microscopy (SEM). The microencapsulated formulation of A. muricata caused irreversible damage to the alimentary canal of P. xylostella, with disorganization, cell stratification, and modifications in the morphology of the cells considered essential for survival. SEM verified that the peritrophic membrane and the muscular layer remained intact during all the assays. The effects were more severe with more hours of exposure. These results demonstrated that after contact by ingestion, the insect dies due to intoxication and cellular disorganization, inhibiting its ability to continue feeding. RESUMO: O objetivo deste estudo foi obter informações sobre a morfologia externa e interna do canal alimentar da principal praga das brássicas, Plutella xylostella L. (Lepidoptera: Plutellidae), quando exposta a uma formulação microencapsulada do extrato da semente de Annona muricata L. (Annonaceae). A toxicidade da formulação microencapsulada das lagartas alimentadas por 12, 24 e 48 horas mais o controle foi avaliada para verificar alterações morfológicas externas e internas causadas pelo extrato que possam ter causado a morte das lagartas. Após os ensaios, o canal alimentar das lagartas foi dissecado, fixado, desidratado, bloqueado, cortado e colorido. Em seguida, lâminas histológicas foram produzidas e estudadas em microscopia óptica e microscopia de varredura (MEV). A formulação microencapsulada de A. muricata, causou danos irreversíveis ao canal alimentar de P. xylostella, com desorganização, estratificação celular e modificações na morfologia das células consideradas essenciais para a sobrevivência. Na análise por MEV, verificou-se que a membrana peritrófica e a camada muscular permaneceram intactas durante todos os ensaios. Os efeitos foram mais graves com mais horas de exposição. 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The microencapsulated formulation of A. muricata caused irreversible damage to the alimentary canal of P. xylostella, with disorganization, cell stratification, and modifications in the morphology of the cells considered essential for survival. SEM verified that the peritrophic membrane and the muscular layer remained intact during all the assays. The effects were more severe with more hours of exposure. These results demonstrated that after contact by ingestion, the insect dies due to intoxication and cellular disorganization, inhibiting its ability to continue feeding. RESUMO: O objetivo deste estudo foi obter informações sobre a morfologia externa e interna do canal alimentar da principal praga das brássicas, Plutella xylostella L. (Lepidoptera: Plutellidae), quando exposta a uma formulação microencapsulada do extrato da semente de Annona muricata L. (Annonaceae). 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Then, histological slides were produced and studied under light microscopy and scanning microscopy (SEM). The microencapsulated formulation of A. muricata caused irreversible damage to the alimentary canal of P. xylostella, with disorganization, cell stratification, and modifications in the morphology of the cells considered essential for survival. SEM verified that the peritrophic membrane and the muscular layer remained intact during all the assays. The effects were more severe with more hours of exposure. These results demonstrated that after contact by ingestion, the insect dies due to intoxication and cellular disorganization, inhibiting its ability to continue feeding. RESUMO: O objetivo deste estudo foi obter informações sobre a morfologia externa e interna do canal alimentar da principal praga das brássicas, Plutella xylostella L. (Lepidoptera: Plutellidae), quando exposta a uma formulação microencapsulada do extrato da semente de Annona muricata L. (Annonaceae). A toxicidade da formulação microencapsulada das lagartas alimentadas por 12, 24 e 48 horas mais o controle foi avaliada para verificar alterações morfológicas externas e internas causadas pelo extrato que possam ter causado a morte das lagartas. Após os ensaios, o canal alimentar das lagartas foi dissecado, fixado, desidratado, bloqueado, cortado e colorido. Em seguida, lâminas histológicas foram produzidas e estudadas em microscopia óptica e microscopia de varredura (MEV). A formulação microencapsulada de A. muricata, causou danos irreversíveis ao canal alimentar de P. xylostella, com desorganização, estratificação celular e modificações na morfologia das células consideradas essenciais para a sobrevivência. Na análise por MEV, verificou-se que a membrana peritrófica e a camada muscular permaneceram intactas durante todos os ensaios. Os efeitos foram mais graves com mais horas de exposição. 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source SciELO Brazil; Alma/SFX Local Collection
subjects AGRONOMY
diamondback moth
light microscopy
scanning electron microscopy (SEM)
Soursop
title Morphological analysis of the alimentary canal of Plutella xylostella (Linnaeus, 1758) (Lepidoptera: Plutellidae) submitted to microencapsulated formulation of Annona muricata L. (Annonaceae)
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