dc.creator | Bacalhau, Fabiana Britti | |
dc.date.accessioned | 2022-01-17T19:08:53Z | |
dc.date.available | 2022-01-17T19:08:53Z | |
dc.date.issued | 2020-03-05 | |
dc.identifier.uri | http://repositorio.ufsm.br/handle/1/23558 | |
dc.description.abstract | Genetically modified soybeans expressing Bacillus thuringiensis Berliner (Bt) proteins have
revolutionized pest management throughout South America due to efficacy against major
soybean pests. The pyramided genetically modified soybean [Glycine max L. (Merr.)]
MON87751 × MON87708 × MON87701 × MON89788, expressing Cry1Ac, Cry1A.105 and
Cry2Ab2 from Bacillus thuringiensis Berliner was approved for commercial use in Brazil. In
this study were conducted laboratory, greenhouse and field studies to assess the performance
of this Bt soybean technology against key soybean lepidopteran pests and support insect
resistance management plans. Laboratory studies were carried out with purified proteins
Cry1Ac, Cry1A.105 and Cry2Ab2 in artificial diet and soybean leaf discs to assess the
susceptibility of the species, and greenhouse and field to assess the efficacy of the technology
in high infestation and unde natural infestations in field conditions. Neonates of Anticarsia
gemmatalis (Hübner), Chrysodeixis includens (Walker) and Helicoverpa armigera (Hübner)
were susceptible to Cry1Ac (LC50 from 0.15 to 5.07), Cry1A.105 (LC50 from 0.79 to 48.22)
and Cry2Ab2 (LC50 from 1.24 to 8.36) Bt proteins in diet-overlay bioassays. In laboratory leaf
disc bioassays and greenhouse trials, MON87751 × MON87708 × MON87701 × MON89788
soybean as well as the individual components were effective in controlling A. gemmatalis, C.
includens and H. armigera. Similarly, under field conditions, the pyramided event expressing
Cry1A.105, Cry2Ab2 and Cry1Ac was highly effective at protecting soybean against C.
includens. The individual proteins expressed by genetically modified soybean MON87751 ×
MON87708 × MON87701 × MON89788 killed all or nearly all the susceptible A. gemmatalis,
C. includens and H. armigera, fulfilling an important pyramided Bt criterion which is the
concept of redundant mortality, as a strategy for delaying resistance and sustaining the benefits
of Bt soybean in Brazil. | eng |
dc.language | por | por |
dc.publisher | Universidade Federal de Santa Maria | por |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 International | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | Soja transgênica | por |
dc.subject | Bacillus thuringiensis (Bt) | por |
dc.subject | Eficácia | por |
dc.subject | Manejo da resistência de insetos | por |
dc.subject | Transgenic soybean | eng |
dc.subject | Efficacy | eng |
dc.subject | Insect resistance management | eng |
dc.title | Performance da soja que expressa as proteínas inseticidas Cry1A.105, Cry2Ab2 e Cry1Ac para controle de lepidópteros-praga e manejo da resistência de insetos | por |
dc.title.alternative | Performance of soybean expressing insecticidal proteins Cry1A.105, Cry2Ab2 and Cry1Ac for control of lepidopteran pests and insect resistance management | eng |
dc.type | Dissertação | por |
dc.description.resumo | A soja geneticamente modificada que expressa genes da bactéria Bacillus thuringiensis Berliner
(Bt) tem revolucionado o manejo de pragas na América do Sul, devido sua eficácia contra as
principais lagartas desfolhadoras da soja. O evento de soja expressando Cry1A.105, Cry1Ac e
Cry2Ab2 (evento MON87751 × MON87708 × MON87701 × MON89788) foi aprovado pela
CTNBio para uso comercial, sendo essa uma nova opção para o Manejo Integrado de Pragas e
Manejo de Resistência de Insetos. Para entender o valor dessa nova tecnologia no manejo de
lagartas defolhadoras da soja, foram realizados estudos em laboratório, casa de vegetação e
campo para avaliar a performance da soja MON87751 × MON87708 × MON87701 ×
MON89788 no controle de Anticarsia gemmatalis (Hübner), Chrysodeixis includens (Walker)
e Helicoverpa armigera (Hübner). Em laboratório, estudos com as proteínas purificadas
Cry1A.105, Cry1Ac e Cry2Ab2 (em dieta artificial) e disco de folha dos eventos (MON87751
× MON87701, MON87751, MON87701, A845232 e A844620) foram realizados para avaliar
a suscetibilidade das espécies. Em casa de vegetação os estudos foram realizados sobre
condições de alta infestação e a campo sobre infestação natural. Neonatas de A. gemmatalis, C.
includens e H. armigera foram suscetíveis as proteínas Cry1Ac: CL50 (0,15 – 5,07),
Cry1A.105: CL50 (0,79 – 48,22) e Cry2Ab2: CL50 (1,24 – 8,36). Nos bioensaios com discos de
folha e em casa de vegetação a soja MON87751 × MON87708 × MON87701 × MON89788 e
seus eventos individuais foram eficazes no controle A. gemmatalis, C. includens e H. armigera.
De modo similar, em condições de campo, a soja MON87751 × MON87708 × MON87701 ×
MON89788 foi eficaz contra C. includens. As proteínas Cry1A.105, Cry1Ac, Cry2Ab2
expressas isoladamente e no evento de soja MON87751 × MON87708 × MON87701 ×
MON89788 foram eficazes para controle de A. gemmatalis, C. includens e H. armigera,
atendendo um importante critério, o de pirâmide de genes, que é o conceito de mortalidade
redundante, para o manejo da resistência de insetos. | por |
dc.contributor.advisor1 | Bernardi, Oderlei | |
dc.contributor.advisor1Lattes | http://lattes.cnpq.br/3085175517473196 | por |
dc.contributor.referee1 | Salvadori, José Roberto | |
dc.contributor.referee2 | Dourado, Patrick Marques | |
dc.creator.Lattes | http://lattes.cnpq.br/4803859362490120 | por |
dc.publisher.country | Brasil | por |
dc.publisher.department | Agronomia | por |
dc.publisher.initials | UFSM | por |
dc.publisher.program | Programa de Pós-Graduação em Agronomia | por |
dc.subject.cnpq | CNPQ::CIENCIAS AGRARIAS::AGRONOMIA | por |
dc.publisher.unidade | Centro de Ciências Rurais | por |