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Methyl jasmonate increases the tropane alkaloid scopolamine and reduces natural herbivory in Brugmansia suaveolens: is scopolamine responsible for plant resistance?
Arab, A; Alves, M N; Sartoratto, A; Ogasawara, D C; Trigo, J R.
Afiliação
  • Arab A; Lab de Ecologia Química, Depto de Biologia Animal, Instituto de Biologia, Campinas, SP, Brasil.
Neotrop Entomol ; 41(1): 2-8, 2012 Feb.
Article em En | MEDLINE | ID: mdl-23950002
The tropane alkaloid (TA) scopolamine is suggested to protect Brugmansia suaveolens (Solanaceae) against herbivorous insects. To test this prediction in a natural environment, scopolamine was induced by methyl jasmonate (MJ) in potted plants which were left 10 days in the field. MJ-treated plants increased their scopolamine concentration in leaves and herbivory decreased. These findings suggest a cause-effect relationship. However, experiments in laboratory showed that scopolamine affect differently the performance of the specialist larvae of the ithomiine butterfly Placidina euryanassa (C. Felder & R. Felder) and the generalist fall armyworm Spodoptera frugiperda (J. E. Smith): the specialist that sequester this TA from B. suaveolens leaves was not negatively affected, but the generalist was. Therefore, scopolamine probably acts only against insects that are not adapted to TAs. Other compounds that are MJ elicited may also play a role in plant resistance against herbivory by generalist and specialist insects, and deserve future investigations.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Escopolamina / Solanaceae / Ciclopentanos / Oxilipinas / Herbivoria / Insetos / Acetatos Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: Neotrop Entomol Assunto da revista: BIOLOGIA Ano de publicação: 2012 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Escopolamina / Solanaceae / Ciclopentanos / Oxilipinas / Herbivoria / Insetos / Acetatos Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: Neotrop Entomol Assunto da revista: BIOLOGIA Ano de publicação: 2012 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda