Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatum
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/17114 |
Resumo: | Fungi naturally present in olive trees were isolated, identified and tested for their potential to be used as biological agents against C. acutatum, the causal agent of anthracnose, one of the most important olive diseases. Antagonistic activity and effect of their secondary metabolites was evaluated through dual culture growth, agar-diffusion and volatile tests. A total of 14 isolates were identified from olive leaves, 12 belonged to genera Alternaria, Epicoccum, Fusarium, Aspergillus, Anthinium, Chaetomium, Diaporthe, Nigrospora, 1 to family Xylariaceae and 1 was unclassified. The most frequent isolates, composing half of the isolates identified, belonged to genera Alternaria, Fusarium or to species Epicoccum nigrum. All fungal isolates, when grown in dual culture, showed some inhibitory action over the growth of C. acutatum. Maximum inhibition was observed with A. niger (86.3%), N. oryzae (66.7%) and the unclassified endophyte (68.6%). Volatiles tests showed that all fungal isolates produced volatiles that caused similar inhibition rates of C. acutatum growth. Significant differences on C. acutatum growth inhibition were obtained when agar diffusible tests were performed, where only 5 fungal isolates caused C. acutatum growth inhibition: Alternaria sp. isolate 2 (26.8%), the fungus from Xylariaceae family (14.3%), Alternaria sp. isolate 1 (10.7%); Diaporthe sp. (10.7%), Nigrospora oryzae (3.5%). Volatile substances produced by these different isolates were identified through gas chromatography techniques, as phenylethyl alcohol, 4-methylquinazoline, benzothiazole, benzyl alcohol, lilial, galaxolide, among others. These inhibitory volatiles could play a significant role in reduction of C. acutatum expansion in olive and their study as potential biocontrol agents should be further explored. This would be of great interest to meet one of the main concerns of public health that is the excess of chemical fungicides on crop plants. |
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Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatumOleae europaeaColletotrichum acutatumBiological controlFungi naturally present in olive trees were isolated, identified and tested for their potential to be used as biological agents against C. acutatum, the causal agent of anthracnose, one of the most important olive diseases. Antagonistic activity and effect of their secondary metabolites was evaluated through dual culture growth, agar-diffusion and volatile tests. A total of 14 isolates were identified from olive leaves, 12 belonged to genera Alternaria, Epicoccum, Fusarium, Aspergillus, Anthinium, Chaetomium, Diaporthe, Nigrospora, 1 to family Xylariaceae and 1 was unclassified. The most frequent isolates, composing half of the isolates identified, belonged to genera Alternaria, Fusarium or to species Epicoccum nigrum. All fungal isolates, when grown in dual culture, showed some inhibitory action over the growth of C. acutatum. Maximum inhibition was observed with A. niger (86.3%), N. oryzae (66.7%) and the unclassified endophyte (68.6%). Volatiles tests showed that all fungal isolates produced volatiles that caused similar inhibition rates of C. acutatum growth. Significant differences on C. acutatum growth inhibition were obtained when agar diffusible tests were performed, where only 5 fungal isolates caused C. acutatum growth inhibition: Alternaria sp. isolate 2 (26.8%), the fungus from Xylariaceae family (14.3%), Alternaria sp. isolate 1 (10.7%); Diaporthe sp. (10.7%), Nigrospora oryzae (3.5%). Volatile substances produced by these different isolates were identified through gas chromatography techniques, as phenylethyl alcohol, 4-methylquinazoline, benzothiazole, benzyl alcohol, lilial, galaxolide, among others. These inhibitory volatiles could play a significant role in reduction of C. acutatum expansion in olive and their study as potential biocontrol agents should be further explored. This would be of great interest to meet one of the main concerns of public health that is the excess of chemical fungicides on crop plants.Inalentejo ALENT-07-0324- FEDER-001747, OPERAC¸ ÃO: Gestão Integrada da Protec¸ ão do Olival Alentejano. Contributos para o seu desenvolvimento e implementac¸ ão. Carla Marisa R. Varanda is recipient of a PhD fellowship from Fundac¸ ão para a Ciência e a Tecnologia (FCT), SFRH/BPD/76194/2011, financed by QREN – POPH – Typology 4.1—co-financed by MES national funding and the European Social Fund. This work has been supported by FEDER and National funds, through the Programa Operacional Regional do Alentejo (InAlentejo) Operation ALENT-07-0262-FEDER-001871/Laboratório de Biotecnologia Aplicada e Tecnologias Agro-Ambientais.Congress of Microbiology and Biotechnology2016-01-29T15:56:22Z2016-01-292015-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10174/17114http://hdl.handle.net/10174/17114engLandum, M. C. Félix, M. R. Alho, J. Garcia R. Cabrita M.J. Rei, F. Varanda, C.M.R,. 2015. Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatum. Congress of Microbiology and Biotechnology, December, Universidade de Évora, Évora, Portugal, pag.146naonaosimndmrff@uevora.ptndraquelg@uevora.ptmjbc@uevora.ptfrei@uevora.ptcarlavaranda@uevora,pr581Landum, MiguelFélix, RosárioAlho, JoanaGarcia, RaquelCabrita, Maria JoãoRei, FernandoVaranda, Carlainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:04:14Zoai:dspace.uevora.pt:10174/17114Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:09:17.895013Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatum |
title |
Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatum |
spellingShingle |
Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatum Landum, Miguel Oleae europaea Colletotrichum acutatum Biological control |
title_short |
Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatum |
title_full |
Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatum |
title_fullStr |
Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatum |
title_full_unstemmed |
Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatum |
title_sort |
Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatum |
author |
Landum, Miguel |
author_facet |
Landum, Miguel Félix, Rosário Alho, Joana Garcia, Raquel Cabrita, Maria João Rei, Fernando Varanda, Carla |
author_role |
author |
author2 |
Félix, Rosário Alho, Joana Garcia, Raquel Cabrita, Maria João Rei, Fernando Varanda, Carla |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Landum, Miguel Félix, Rosário Alho, Joana Garcia, Raquel Cabrita, Maria João Rei, Fernando Varanda, Carla |
dc.subject.por.fl_str_mv |
Oleae europaea Colletotrichum acutatum Biological control |
topic |
Oleae europaea Colletotrichum acutatum Biological control |
description |
Fungi naturally present in olive trees were isolated, identified and tested for their potential to be used as biological agents against C. acutatum, the causal agent of anthracnose, one of the most important olive diseases. Antagonistic activity and effect of their secondary metabolites was evaluated through dual culture growth, agar-diffusion and volatile tests. A total of 14 isolates were identified from olive leaves, 12 belonged to genera Alternaria, Epicoccum, Fusarium, Aspergillus, Anthinium, Chaetomium, Diaporthe, Nigrospora, 1 to family Xylariaceae and 1 was unclassified. The most frequent isolates, composing half of the isolates identified, belonged to genera Alternaria, Fusarium or to species Epicoccum nigrum. All fungal isolates, when grown in dual culture, showed some inhibitory action over the growth of C. acutatum. Maximum inhibition was observed with A. niger (86.3%), N. oryzae (66.7%) and the unclassified endophyte (68.6%). Volatiles tests showed that all fungal isolates produced volatiles that caused similar inhibition rates of C. acutatum growth. Significant differences on C. acutatum growth inhibition were obtained when agar diffusible tests were performed, where only 5 fungal isolates caused C. acutatum growth inhibition: Alternaria sp. isolate 2 (26.8%), the fungus from Xylariaceae family (14.3%), Alternaria sp. isolate 1 (10.7%); Diaporthe sp. (10.7%), Nigrospora oryzae (3.5%). Volatile substances produced by these different isolates were identified through gas chromatography techniques, as phenylethyl alcohol, 4-methylquinazoline, benzothiazole, benzyl alcohol, lilial, galaxolide, among others. These inhibitory volatiles could play a significant role in reduction of C. acutatum expansion in olive and their study as potential biocontrol agents should be further explored. This would be of great interest to meet one of the main concerns of public health that is the excess of chemical fungicides on crop plants. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-01-01T00:00:00Z 2016-01-29T15:56:22Z 2016-01-29 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/17114 http://hdl.handle.net/10174/17114 |
url |
http://hdl.handle.net/10174/17114 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Landum, M. C. Félix, M. R. Alho, J. Garcia R. Cabrita M.J. Rei, F. Varanda, C.M.R,. 2015. Antagonistic activity of fungi of Olea europaea L. against Colletotrichum acutatum. Congress of Microbiology and Biotechnology, December, Universidade de Évora, Évora, Portugal, pag.146 nao nao sim nd mrff@uevora.pt nd raquelg@uevora.pt mjbc@uevora.pt frei@uevora.pt carlavaranda@uevora,pr 581 |
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info:eu-repo/semantics/openAccess |
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openAccess |
dc.publisher.none.fl_str_mv |
Congress of Microbiology and Biotechnology |
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Congress of Microbiology and Biotechnology |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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