Data/hora: 11/06/2024 19:33:52

Biblioteca(s): | Embrapa Arroz e Feijão.
Data corrente: | 02/04/2015
Data da última atualização: | 05/04/2016
Autoria: | SILVA, R. A. da; QUINTELA, E. D.; MASCARIN, G. M.; PEDRINI, N.; LIÃO, L. M.; FERRI, P. H.
Afiliação: | RODRIGO ALVES DA SILVA, INSTITUTO FEDERAL DE BRASÍLIA; ELIANE DIAS QUINTELA, CNPAF; GABRIEL MOURA MASCARIN, CNPAF; NICOLAS PEDRINI, INSTITUTO DE INVESTIGACIONES DE LA PLATA, ARGENTINA; LUCIANO MORAES LIÃO, UFG; PEDRO HENRIQUE FERRI, UFG.
Título: | Unveiling chemical defense in the rice stalk stink bug against the entomopathogenic fungus Metarhizium anisopliae.
Ano de publicação: | 2015
Fonte/Imprenta: | Journal of Invertebrate Pathology, v. 127, p. 93-100, 2015.
ISSN: | 0022-2011
DOI: | 10.1016/j.jip.2015.03.009
Idioma: | Inglês
Conteúdo: | Eggs, nymphs (1st-5th instar) and adults of Tibraca limbativentris were challenged by conidial suspensions of its major fungal pathogen Metarhizium anisopliae in order to assess their susceptibility. The role of chemical defensive compounds from exocrine secretions produced by both nymphs and adults were examined for their participation on M. anisopliae infection. Although insect susceptibility to M. anisopliae followed a dose-dependent manner, adults followed by older nymphs displayed the highest resistance. Eggs were highly susceptible showing >96% fungal infection. Crude extracts isolated from metathoracic scent gland and dorsal abdominal glands of adults and nymphs, respectively, showed fungistatic effects by impairing spore germination, vegetative growth and sporulation. Gas chromatography-mass spectrometry analysis of these extracts revealed that the major components were short-chain hydrocarbons (C10-13) and unsaturated aldehydes. In vitro tests with the corresponding synthetic standards indicated compounds with greater antifungal activity including (E)-2-hexenal, (E)-2-octenal, and (E)-2-decenal, with the latter being the most deleterious to fungal fitness. We demonstrated that differential susceptibility of the rice stalk stink bug to M. anisopliae infection is age-specific and partly mediated by fungistatic properties of aldehydes, which are produced by scent glands of both nymphs and adults.
Thesagro: | Arroz; Fungo; Metarhizium anisopliae; Oryza sativa; Tibraca limbativentris.
Thesaurus Nal: | Allelochemicals; Chemical ecology; Clavicipitaceae; Virulence.
Categoria do assunto: | O Insetos e Entomologia
Registro original: | Embrapa Arroz e Feijão (CNPAF)
Exemplares: | CNPAF - (33254-1) - UPC - AP - DD - 2015.011 -  - 2015.011 - DIS