Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/23650
Tipo: Artigo
Título: Toxicological and morphological effects of tebufenozide on Anticarsia gemmatalis (Lepidoptera: Noctuidae) larvae
Autor(es): Fiaz, Muhammad
Martínez, Luis Carlos
Plata-Rueda, Angelica
Gonçalves, Wagner Gonzaga
Shareef, Muhammad
Zanuncio, José Cola
Serrão, José Eduardo
Abstract: The velvetbean caterpillar, Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae), is an important soybean pest in the Americas. Tebufenozide, a novel nonsteroidal ecdysone agonist is used to control this pest. Bioassays were conducted to assess tebufenozide toxicity and their ultrastructural effects on midgut of A. gemmatalis. The toxicity, survivorship, behavior response, and respiration rate for A. gemmatalis larvae after exposure to tebufenozide were evaluated. Also, A. gemmatalis larvae were treated with LC50 obtained from tebufenozide and changes were observed on their midgut cells after 24, 48 and 96 h. Tebufenozide was toxic to A. gemmatalis (LC50 = 3.86 mg mL−1 and LC90 = 12.16 mg mL−1) and survivorship was 95% for adults that had not been exposed to tebufenozide, decreasing to 52% with LC50 and 27% with LC90 estimated value. Damage to midgut cells was increased with exposure time. These cells show damaged striated border with release of protrusions to the midgut lumen, damaged nuclear membrane and nucleus with condensed chromatin and increase in amount of autophagic vacuoles. Mitochondria were modified into nanotunnels which might be an evidence that tebufenozide induces damage to cells, resulting in cell death, proved by immunofluorescence analyses. This insecticide also caused paralysis movement with change in homeostasis and compromised larval respiration. Thus, sublethal exposure to tebufenozide is sufficient to disturb the ultrastructure of A. gemmatalis midgut, which might compromise insect fitness, confirming tebufenozide a possible controlling insecticide.
Palavras-chave: Autophagy
Insecticide
Respirometer rate
Survivorship
Toxicity
Ultrastructure
Velvet bean caterpillar
Editor: Chemosphere
Tipo de Acesso: 2018 Elsevier Ltd. All rights reserved.
URI: https://doi.org/10.1016/j.chemosphere.2018.08.088
http://www.locus.ufv.br/handle/123456789/23650
Data do documento: Dez-2018
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