Streptomycetes antagonism against Cladosporium fulvum cooke and Fusarium oxysporium f.sp. lycopersici/Antagonismo de estreptomicetos a Cladosporium fulvum Cooke e Fusarium oxysporium f.sp. lycopersici

This research aimed to evaluate the secondary effects of secondary metabolites produced by streptomycetes on spore germination and mycelial growth of the phytopathogenic fungi Cladosporium fulvum Cooke and Fusarium oxysporium f. sp. lycopersici from tomato plants. Metabolites produced by streptomyce...

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Bibliographic Details
Published in:Ciência rural 2009-09, Vol.39 (6), p.1897-1900
Main Authors: Soares, Ana Cristina Fermino, Sousa, Carla da Silva, Garrido, Marlon da Silva
Format: Article
Language:eng ; spa
Subjects:
actinomicetos
actinomycetes
biocontrol
biocontrole
Biological control
metabólitos secundários
Pests
Plant metabolites
Polyketides
secondary metabolites
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Summary:This research aimed to evaluate the secondary effects of secondary metabolites produced by streptomycetes on spore germination and mycelial growth of the phytopathogenic fungi Cladosporium fulvum Cooke and Fusarium oxysporium f. sp. lycopersici from tomato plants. Metabolites produced by streptomycete isolates codified as AC147 and AC-92 caused 94.1% inhibition of C. fulvum while AC-95 isolate caused 33.9% inhibition. AC-92 was the most efficient for F. oxysporum f. sp. lycopersici, causing 94.2% inhibition of spore germination. For mycelial growth, AC-26 and AC-92 were the most efficient in inhibiting C. fulvum growth by 46.6% and F. oxysporum f. sp. lycopersici by 29.9%. These streptomycetes are potential agents for biocontrol development methods of these tomato plant pathogenic fungi. Key words: biocontrol, actinomycetes, secondary metabolites. Este trabalho teve como objetivo avaliar o efeito de metabolitos secundarios produzidos por estreptomicetos na germinacao de esporos e no crescimento micelial dos fungos Cladosporium fulvum Cooke e Fusarium oxysporum sp. f. lycopersici da cultura do tomateiro. Metabolitos produzidos pelos isolados AC-147 e AC-92 causaram 94,1% de inibicao da germinacao de esporos de C. fluvum, enquanto que o isolado AC-95 causou 33,9% de inibicao. O AC-92 foi o mais eficiente para F. oxysporum f. sp. lycopersici, causando 94,2% de inibicao na germinacao de esporos. Para o crescimento micelial, AC-26 e AC-92 foram os mais eficientes na inibicao dos fungos C. fulvum, em 46,6%, e F. oxysporum f. sp. Lycopersici, em 29,9%. Esses estreptomicetos sao potenciais agentes para o desenvolvimento de metodos de controle biologico desses fungos fitopatogenicos do tomateiro. Palavras-chave: biocontrole, actinomicetos, metabolitos secundarios.
ISSN:0103-8478
1678-4596