Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/19798
Tipo: Artigo
Título: Fitness costs and stability of Cry1Fa resistance in Brazilian populations of Spodoptera frugiperda
Autor(es): Santos-Amaya, Oscar F
Tavares, Clébson S
Rodrigues, João Victor C
Campos, Silverio O
Guedes, Raul Narciso C
Alves, Analiza P
Pereira, Eliseu José G
Abstract: The presence of fitness costs of resistance to Bacillus thuringiensis (Bt) insecticidal proteins in insect populations may delay or even reverse the local selection of insect resistance to Bt transgenic crops, and deserves rigorous investigation. Here we assessed the fitness costs associated with Cry1Fa resistance in two strains of fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), derived from field collections in different Brazilian regions and further selected in the laboratory for high levels of resistance to Cry1Fa using leaves of TC1507 corn. Fitness components were compared using paired resistant and susceptible strains with similar genetic backgrounds and F1 generations from reciprocal crosses, all of them reared on non‐transgenic corn leaves. No apparent life history costs in the larval stage were observed in the Bt‐resistant strains. Moreover, the resistance remained stable for seven generations in the absence of selection, with no decrease in the proportion of resistant individuals. Larval respiration rates were also similar between resistant and susceptible homozygotes, and heterozygotes displayed respiration rates and demographic performance equal or superior to those of susceptible homozygotes. In combination, these results indicate the lack of strong fitness costs associated with resistance to Cry1Fa in the fall armyworm strains studied. These findings suggest that Cry1Fa resistance in S. frugiperda populations is unlikely to be counterselected in Cry1Fa‐free environments.
Palavras-chave: Bt resistance
Pleiotropic effects
Fall armyworm
Isogenic strains
Life-history traits
Intrinsic rate of population increase
Resistance management
Editor: Pest Management Science
Tipo de Acesso: Open Access
URI: https://doi.org/10.1002/ps.4312
http://www.locus.ufv.br/handle/123456789/19798
Data do documento: 5-Mai-2016
Aparece nas coleções:Artigos

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
artigo.pdftexto completo367,37 kBAdobe PDFThumbnail
Visualizar/Abrir


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.