Secondary metabolites produced by Propionicimonas sp (ENT-18) induce histological abnormalities in the sclerotia of Sclerotinia sclerotiorum

Autor(es)

Zucchi, Tiago D. ^[1] ; Almeida, Luis G. ^[1] ; Dossi, Fabio C. A. ^[1] ; Consoli, Fernando L. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, ESALQ USP, Dept Entomol & Acarol, Escola Super Agr Luiz de Queiroz, BR-13418900 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BIOCONTROL; v. 55, n. 6, p. 811-819, DEC 2010.
• Citações Web of Science: 8

Resumo

Sclerotinia sclerotiorum is a highly aggressive pathogen that causes great economic losses, especially in temperate climates. Several biological control agents are available, but actinobacteria have seldom been used to control this fungus. Our objective was to evaluate the efficiency and ultrastructural effects of the secondary metabolites produced by the ant-associated actinobacterium Propionicimonas sp. ENT-18 in controlling the sclerotia of S. sclerotiorum. We demonstrated total inhibition of sclerotia treated with 62.5 mu g/10 mu l of an ethyl acetate extract of compounds produced by ENT-18, and calculated an LC(50) of 1.69 mu g/sclerotia. Histological and ultrastructural analysis indicated that the cells of the treated sclerotia were severely damaged, suggesting direct action of the biomolecule(s) produced by the actinobacterium ENT-18 on the cell structure of the medullae and rind cell wall. This is the first report demonstrating a novel property of Propionicimonas sp.-antifungal activity against S. sclerotiorum. (AU)

• Processo FAPESP: 07/58712-5 - Actinobactérias simbiontes de Acromyrmex sp.: fonte potencial de novas biomoléculas para o controle de pragas e doenças
• Beneficiário: Tiago Domingues Zucchi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado