Interação das proteínas CRY1, CRY2 E VIP3 de Bacillus thuringiensis no controle de Anticarsia gemmatalis, Chrysodeixis includens e Spodoptera frugiperda /

• Main Author: Figueiredo, Camila Soares.
• Other Authors: Universidade Estadual Paulista "Júlio de Mesquita Filho" Faculdade de Ciências Agrárias e Veterinárias.
• Format: Others
• Language: Portuguese
• Published: Jaboticabal, 2017
• Subjects: Pragas agricolas - Controle.; Lepidoptero.; Proteínas.; Bacillus thuringiensis.; Lagarta.; Agricultural pests.
• Online Access: http://hdl.handle.net/11449/149877

Orientador: Janete Apparecida Desidério === Banca: Vivian Boter Bergamasco === Banca: Sonia Marli Zingaretti === Banca: Odair Aprecido Fernandes === Banca: Ana Maria Guidelli Thuler === Resumo: Este trabalho teve como objetivo estudar a toxicidade e a interação entre proteínas Cry1Ab, Cry1Ac, Cry2Aa, Cry2Ab e Vip3Aa em lagartas neonatas de Anticarsia gemmatalis, Chrysodeixis includens e Spodoptera frugiperda. Lisados das proteínas foram utilizados em bioensaios com lagartas neonatas para determinar a CL50 e CL90 das proteínas Cry1Ab, Cry1Ac, Cry2Aa, Cry2Ab e Vip3Aa e realizar experimentos histopatológicos. Ensaios de competição, entre as proteínas Cry1, Cry2 e Vip3 biotiniladas, foram realizados com as proteínas das vesículas de membrana da microvilosidade apical do intestino médio ("Brush Border Membrane Vesicles" - BBMV) das lagartas. Foi feita a purificação de receptores para toxina Cry1Ac a partir da BBMV de A. gemmatalis e C. includens por afinidade seguida da identificação das proteínas ligantes. As toxinas Cry1A e Cry2A demonstraram maior toxicidade para A. gemmatalis e C. includens que a proteína Vip3Aa, porém o inverso foi observado em S. frugiperda. As lagartas da espécie A. gemmatalis se mostraram mais suscetíveis as proteínas testadas do que as de S. frugiperda e C. includens. As espécies diferiram também quanto ao tipo de interação entre as toxinas. Enquanto para S. frugiperda e C. includens, as interações foram sinérgicas, para A. gemmatalis foram predominantemente antagônicas. As proteínas se uniram aos receptores presentes nas BBMV de S. frugiperda, A. gemmatalis e C. includens, permitindo inferir sobre a presença e ausência de comp... (Resumo completo, clicar acesso eletrônico abaixo) === Abstract: This work aimed to study the toxicity and interaction between Cry1Ab, Cry1Ac, Cry2Aa, Cry2Ab and Vip3Aa proteins in neonate larvae of Spodoptera frugiperda, Anticarsia gemmatalis and Chrysodeixis includens. Lysates containing proteins were used in bioassays for the determination of LC50 and LC90 of the Cry1Ab, Cry1Ac, Cry2Aa, Cry2Ab and Vip3Aa proteins. Histopathological experiments were realized with A. gemmatalis, C. includens (fed with Cry1Ac and Vip3Aa) and S frugiperda (fed with Cry1Ab and Vip3Aa). Competition assays, among biotinylated Cry1, Cry2 and Vip3 proteins, were performed with brush border membrane vesicles (BBMV) proteins from A. gemmatalis, C. includens and S. frugiperda. Purification of Cry1Ac receptors from A. gemmatalis and C. includens BBMV was performed by affinity followed by identification of binding proteins. The Cry1A and Cry2A toxins demonstrated higher toxicity to A. gemmatalis and C. includens than the Vip3Aa protein, but the inverse was observed to S. frugiperda. A. gemmatalis larvae were more susceptible as Cry and Vip proteins than as S. frugiperda and C. includens. Species differed about type of protoxins interaction. While for S. frugiperda and C. includens, the protoxins showed as synergistic interactions, for A. gemmatalis they were predominantly antagonistic. It was possible to infer about presence and absence of competition of the receptors in the BBMV from S. frugiperda, A. gemmatalis and C. includens. Histopathological changes as vacuolization and disruption were observed in the intestine from S. frugiperda larvae, fed with Cry1Ab and Vip3Aa and A. gemmatalis and C. includens, fed with Cry1Ac and Vip3Aa. Putative receptors were to identified from A. gemmatalis and C. includens to Cry1Ac toxin. The combination of Cry and Vip proteins, as well as helping to manage resistance and can increase toxicity through synergistic acti... (Complete abstract electronic access below) === Doutor