Action of Bacillus thuringiensis (Bacillales: Bacillaceae) in the midgut of the sugarcane borer Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: Crambidae)
| Autor: | Hélio Conte, Bruno Vinicius Daquila, Daiani Rodrigues Moreira, João Alencar Pamphile, Fábio Cleisto Alda Dossi, Elton Luiz Scudeler |
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| Přispěvatelé: | Universidade Estadual de Maringá (UEM), Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Health
Toxicology and Mutagenesis Cytotoxicity Bacillus thuringiensis Histopathology Entomopathogen Moths Diatraea saccharalis Microbiology Lepidoptera genitalia Hemolysin Proteins Bacterial Proteins Crambidae Endotoxin Animals Pest Control Biological Larva biology business.industry fungi Public Health Environmental and Occupational Health Pest control Midgut General Medicine biology.organism_classification Pollution Saccharum Endotoxins Biological Control Agents Sustainability Instar business Digestive System Biotechnology |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2019-10-06T16:47:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-11-30 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) The relevance of Bacillus thuringiensis in pest control strategies have been increasing in recent decades. This entomopathogenic microorganism is considered safe, and its action is highly selective to target organisms. Its toxic effect is attributed to the toxins synthesized during sporulation. The nature of the produced toxins depends on the bacterial variety. Some varieties of B. thuringiensis can synthesize from one to eight distinct toxins, which have specific effects on different orders of susceptible insects. The sugarcane borer, Diatraea saccharalis, is a holometabolous lepidopteran that causes severe damage to sugar cane cultures during its larval phase. Therefore, to evaluate B. thuringiensis serovar Aizawai GC-91 efficiency and its effects on the midgut of first instar D. saccharalis larvae, we reared the insects with contaminated artificial diet for 144 h. Larvae mortality during this period revealed that 5, 10, and 20 g/L concentrations were the most efficient, resulting in 100% mortality of treated larvae, with LC50 and LC90 estimated at 0.307 and 1.330 g/L, respectively. Furthermore, histological and ultrastructural analyses revealed damage to midgut cells. Within the first 24 h of treatment, the midgut of infected insects presented peritrophic membrane degeneration, cytoplasmic vacuolization, and cellular hypertrophy; spherites and calcium granules were also observed. At 48 h of treatment, the digestive system had collapsed, with microvilli degeneration, basement membrane and muscular fiber bundles disruption, and cellular lysis. These results confirm the toxicity of the B. thuringiensis serovar Aizawai GC-91 on D. saccharalis larvae and its potential use as a biocontroller against this pest species. Laboratory of Biological Control Morphology and Insect Cytogenetics Department of Biotechnology Genetics and Cell Biology State University of Maringá - UEM Laboratory of Insects Department of Morphology Institute of Biosciences of Botucatu São Paulo State University - UNESP Microscopy Center Complex of Research Support Centers of the State University of Maringá - UEM Laboratory of Animal Genetics Department of Biotechnology Genetics and Cell Biology State University of Maringá - UEM Laboratory of Microbiology Department of Biotechnology Genetics and Cell Biology State University of Maringá - UEM Laboratory of Insects Department of Morphology Institute of Biosciences of Botucatu São Paulo State University - UNESP |
| Databáze: | OpenAIRE |
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