Data/hora: 26/06/2024 09:42:51

Biblioteca(s): | Epagri-Sede.
Data corrente: | 06/09/2019
Data da última atualização: | 06/09/2019
Autoria: | PERINA, F. J.; ANDRADE, C. C. L.; MOREIRA, S. I.; NERY, E. M.; OGOSHI, C.; ALVES, E.
Título: | Cinnamomun zeylanicum oil and trans-cinnamaldehyde against Alternaria brown spot in tangerine: direct effects and induced resistance.
Ano de publicação: | 2019
Fonte/Imprenta: | Phytoparasitica, Switzerland, v. 47, n. 3, p. 1-12, 2019.
Idioma: | Inglês

Conteúdo:

Cinnamon essential oil (CEO) has proven
activity against several plant-pathogenic fungi and can
reduce fungal diseases to an extent comparable to that
achieved using commercial fungicides. Thus, the goal of
the present work was to identify the active constituents
of this essential oil and determine the direct fungicidal
mode of action as well as putative indirect action by
activation of citrus plant resistance against Alternaria
brown spot (ABS). Gas chromatography?mass spectrometry (GC-MS) of essential oil extracted from
Cinnamomum zeylanicum leaves resulted in the identification of the active constituents eugenol and transcinnamaldehyde, which had, respectively, minimal inhibitory concentrations (MICs) of 250 and
62.5 &#956;g mL&#8722;1 against Alternaria alternata, while, under
the same conditions, the MICs for a commercial fungicide and CEO were 1250 and 500 &#956;g mL&#8722;1 respectively.
Fungal growth inhibition assays showed that eugenol
and trans-cinnamaldehyde (CNE) prevent fungal
growth by direct fungicidal action and proved that
CNE is mainly responsible for the anti-fungal activity
of C. zeylanicum essential oil (CEO). CEO decreased
the incidence of ABS disease to a greater extent than a
commercial copper fungicide and was comparable to a
commercial plant activator. Both CEO and its active
constituent showed the ability to activate plant defense
enzymes, demonstrating a high capacity to induce the
citrus plant defense response. Therefore, both the essential oil and its active constituent have potential use in the
development of new organic structures and analogues to
control ABS disease caused by A. alternata.

Palavras-Chave: | Fungicidal activity; Indirect activity; Plant defense response.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_43234.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (103872-1) - UPC - AP - DD -  -  -  - DIS