Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/28374
Título: Antifungal activity and ultrastructural alterations in Pseudocercospora griseola treated with essential oils
Título(s) alternativo(s): Atividade antifúngica e alterações ultraestruturais em Pseudocercospora griseola tratado com óleos essenciais
Palavras-chave: Angular leaf spot
Transmission electron microscopy
Alternative control of plant disease
Mancha angular
Microscopia eletrônica de transmissão
Controle alternativo de doenças de plantas
Bean - Diseases
Feijão - Doenças
Data do documento: Mai-2012
Editor: Universidade Federal de Lavras
Citação: HOYOS, J. M. A. et al. Antifungal activity and ultrastructural alterations in Pseudocercospora griseola treated with essential oils. Ciência e Agrotecnologia, Lavras, v. 36, n. 3, p. 270-284, maio/jun. 2012.
Resumo: Pseudocercospora griseola, the etiologic agent of angular leaf spot of common bean (Phaseolus vulgaris), is an important disease in all bean-producing regions worldwide and may cause extremely high yield losses. The control of this disease is made more difficult by the pathogen's genetic variability and the inefficiency of fungicides. In this study, of 26 essential oils tested at different concentrations, 25 demonstrated efficiency in affecting the germination of strains 63-31 and 63-63 of the pathogen, reaching inhibition levels of between 80% and 100%. Cymbopogon citratus and Cymbopogon martinii inhibited conidia germination at all concentrations; Eugenia caryophyllata, Cinnamomum sp., Thymus vulgaris, Matricaria recutita, Cordia verbenacea, Origanum vulgare, Cymbopogon nardus, at 0.1 and 0.5%; and Zingiber officinale, Mentha arvensis, Chamaecyparis pisifera, Lavandula officinalis, Ocimum basilicum, Pimpinella anisum, Ocimum selloi, Baccharis dracunculifolia, Laurus nobilis, Citrus sinensis, Melaleuca alternifolia and Eucalyptus globulus, at 0.5%. The main constituents identified were cinnamaldehyde in Cinnamomum sp.; eugenol in E. caryophyllata; trans-β-farnesene in M. recutita; pulegone in C. verbenacea; thymol in T. vulgaris; geranial and neral in C. citratus, and geraniol in C. martini. Through transmission electron microscopy (TEM), it was verified that C. citratus, C. martini and E. caryophyllata presented direct fungitoxic action on P. griseola, causing severe damage to the cellular ultrastructure of the conidia, invalidating germination. These results indicated that essential oils are a promising alternative strategy for the control of angular leaf spot in bean, representing less risk to human health and the environment.
URI: http://repositorio.ufla.br/jspui/handle/1/28374
Aparece nas coleções:DBI - Artigos publicados em periódicos



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