INVESTIGADORES
PONSONE Maria Lorena
artículos
Título:
Effect of water activity and temperature on growth of Aspergillus carbonarius and A. tubingensis and their interactions on ochratoxin A production.
Autor/es:
CHIOTTA M.L.; SOSA D.M.; PONSONE M.L.; CHULZE, S.N.
Revista:
World Mycotoxin Journal
Editorial:
Wageningen Academic Publishers
Referencias:
Lugar: The Netherlands ; Año: 2015
ISSN:
1875-0710
Resumen:
Aspergillus section Nigri are described as the main source of ochratoxin A (OTA) contamination in grapes and wine worldwide. The grape-growing area in Argentina has a wide latitudinal extension with ecological variations that allow the classification of well-demarcated regions. The aims of this study were: to determine the effect of ecophysiological parameters on Aspergillus tubingensis and A. carbonarius growth and to evaluate the interaction between these species on OTA production in synthetic grape juice medium under different water activity (aW) and temperature conditions. The results showed that optimal growth conditions for A. tubingensis and A. carbonarius were 0.98 aW and 28°C but A. tubingensis grew faster than A. carbonarius at all temperatures and water activities tested. OTA production by A. carbonarius was favoured at 20°C and 0.950-0.965 aW, during 14 days incubation. Effect of A. tubingensis on OTA production by A. carbonarius was dependent mainly on temperature. At 35°C, A. tubingensis reduced the OTA production while this effect was not observed at 20°C. More OTA could be produced as a defense reaction against fungal competitors to maintain niche colonization, but in this study no effects by a related species was observed