Antifungal activities of secondary metabolites isolated from liquid fermentations of Stereum hirsutum (Sh134-11) against Botrytis cinerea (grey mould agent)

Research output: Contribution to journalArticle

Abstract

Extracts obtained from liquid mycelial fermentations of the Chilean fungus Stereum hirsutum (Sh134-11) showed antifungal activity against Botrytis cinerea. Two types of extracts were obtained: EtOAc-extract (liquid phase) and MeOH-extract (mycelial phase). Plate diffusion assay showed that EtOAc-extracts were more active than MeOH-extracts. A large-scale fermentation of Sh134-11 and chromatographic methods allowed to isolated four compounds: MS-3, Vibralactone, Vibralactone B and Sterenin D. Only Sterenin D showed antifungal activity against B. cinerea in the tests performed. Effects on the mycelial growth of B. cinerea showed that Sterenin D showed inhibition at 1000-2000 μg/mL reaching 67% and 76% respectively. Sterenin D was more effective to control the sporogenesis, inhibiting in 96% the sporulation at 500 μg/mL. Assays showed that Sterenin D exhibited a minimal fungicidal concentration (MFC) of 50 μg/mL and minimal inhibitory concentration (MIC) at 20 μg/mL.Our study indicated that submerged fermentations of Chilean S. hirsutum (Sh134-11) produced extracts with antifungal activity and Sterenin D is responsible for this activity, which could be used as possible biofungicides alternative to synthetic fungicides.

Details

Authors
  • Pedro Aqueveque
  • Carlos L. Céspedes
  • José Becerra
  • Mario Aranda
  • Olov Sterner
Organisations
External organisations
  • University of Concepción
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Analytical Chemistry
  • Pharmacology and Toxicology

Keywords

  • Antifungal, Botrytis, Chilean fungi, Sterenin D, Stereum, Submerged cultures
Original languageEnglish
Pages (from-to)1048-1054
JournalFood and Chemical Toxicology
Volume109
Early online date2017 May 18
Publication statusPublished - 2017 Nov
Publication categoryResearch
Peer-reviewedYes