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Leaf blade structure of Verbesina macrophylla (Cass.) F. S. Blake (Asteraceae): ontogeny, duct secretion mechanism and essential oil composition.
Bezerra, L D A; Mangabeira, P A O; de Oliveira, R A; Costa, L C D B; Da Cunha, M.
Afiliação
  • Bezerra LDA; Centro de Microscopia Eletrônica, Universidade Estadual de Santa Cruz, Ilheus, Brazil.
  • Mangabeira PAO; Centro de Microscopia Eletrônica, Universidade Estadual de Santa Cruz, Ilheus, Brazil.
  • de Oliveira RA; Centro de Microscopia Eletrônica, Universidade Estadual de Santa Cruz, Ilheus, Brazil.
  • Costa LCDB; Centro de Microscopia Eletrônica, Universidade Estadual de Santa Cruz, Ilheus, Brazil.
  • Da Cunha M; Laboratório de Biologia Celular e Tecidual, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Brazil.
Plant Biol (Stuttg) ; 20(3): 433-443, 2018 May.
Article em En | MEDLINE | ID: mdl-29394523
Secretory structures are common in Asteraceae, where they exhibit a high degree of morphological diversity. The species Verbesina macrophylla, popularly known as assa-peixe, is native to Brazil where it is widely used for medicinal purposes. Despite its potential medical importance, there have been no studies of the anatomy of this species, especially its secretory structures and secreted compounds. This study examined leaves of V. macrophylla with emphasis on secretory structures and secreted secondary metabolites. Development of secretory ducts and the mechanism of secretion production are described for V. macrophylla using ultrastructure, yield and chemical composition of its essential oils. Verbesina macrophylla has a hypostomatic leaf blade with dorsiventral mesophyll and secretory ducts associated with vascular bundles of schizogenous origin. Histochemistry identified the presence of lipids, terpenes, alkaloids and mucopolysaccharides. Ultrastructure suggests that the secretion released into the duct lumen is produced in plastids of transfer cells, parenchymal sheath cells and stored in vacuoles in these cells and duct epithelial cells. The essential oil content was 0.8%, and its major components were germacrene D, germacrene D-4-ol, ß-caryophyllene, bicyclogermacrene and α-cadinol. Secretory ducts of V. macrophylla are squizogenous. Substances identified in tissues suggest that both secretions stored in the ducts and in adjacent parenchyma cells are involved in chemical defence. The essential oil is rich in sesquiterpenes, with germacrene D and its derivatives being notable components.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Óleos Voláteis / Folhas de Planta / Verbesina Idioma: En Revista: Plant Biol (Stuttg) Assunto da revista: BOTANICA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Óleos Voláteis / Folhas de Planta / Verbesina Idioma: En Revista: Plant Biol (Stuttg) Assunto da revista: BOTANICA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido