Alternating temperatures and photoperiod effects on fungal growth and Ochratoxin A production by Aspergillus carbonarius isolated from Tunisian grapes

Souheib Oueslati; Salma Lasram; Antonio J Ramos; Sonia Marin; Ahmed Mliki; Vicente Sanchis; Abdelwahed Ghorbel

doi:10.1016/j.ijfoodmicro.2010.02.003

Alternating temperatures and photoperiod effects on fungal growth and Ochratoxin A production by Aspergillus carbonarius isolated from Tunisian grapes

Int J Food Microbiol. 2010 May 15;139(3):210-3. doi: 10.1016/j.ijfoodmicro.2010.02.003. Epub 2010 Feb 13.

Authors

Souheib Oueslati¹, Salma Lasram, Antonio J Ramos, Sonia Marin, Ahmed Mliki, Vicente Sanchis, Abdelwahed Ghorbel

Affiliation

¹ Laboratory of Molecular Physiology of Grapevine-Borj-Cedria Biotechnology Center. B.P. 901 Hammam-Lif, 2050, Tunisia. souheibo@yahoo.fr

PMID: 20227780
DOI: 10.1016/j.ijfoodmicro.2010.02.003

Abstract

The effect of three alternating temperatures cycles (20/30, 20/37 and 25/42 degrees C) and photoperiod on growth and Ochratoxin A (OTA) production of six isolates of Aspergillus carbonarius on synthetic nutrient medium were investigated. The different temperature regimes affected significantly both the mycelial growth and the OTA production. The best growth and OTA production were recorded at 20/30 degrees C. The isolates from the region of Baddar produced the highest OTA yields. A 24 h light cycle generally enhanced the growth of A. carbonarius. Growth rates cycles of 11 h/13 h light/darkness and 24 h darkness were often similar for individual isolates, such conditions enhanced OTA production in two of the six isolates tested.

Publication types

Comparative Study
Research Support, Non-U.S. Gov't

MeSH terms

Aspergillus / drug effects
Aspergillus / growth & development*
Aspergillus / metabolism
Culture Media
Ochratoxins / biosynthesis*
Photoperiod*
Temperature*
Tunisia
Vitis / microbiology*

Substances

Culture Media
Ochratoxins