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Type: Journal article
Title: Effects of water activity and temperature on the survival of Aspergillus carbonarius spores in vitro
Author: Leong, S.
Hocking, A.
Scott, E.
Citation: Letters in Applied Microbiology, 2006; 42(4):326-330
Publisher: Blackwell Science Ltd
Issue Date: 2006
ISSN: 0266-8254
Abstract: <h4>Aims</h4>To determine the effect of water activity (a(w)) and temperature on the survival of Aspergillus carbonarius spores.<h4>Methods and results</h4>Spores of A. carbonarius were dried onto filter membranes. These filters were held at 1.0, 0.9, 0.8, 0.6 and 0.4 a(w) and at 1, 15, 25 and 37 degrees C for up to 618 d. At intervals, spores were recovered from filters and assessed for viability by enumeration on dichloran rose bengal chloramphenicol agar. Survival and subsequent growth of spores was prolonged at low temperatures and at a(w) below 0.6. Above 15 degrees C, 0.6-0.9 a(w) were often more deleterious than 1.0. However, at 1 degrees C and 1.0 a(w), spores lost viability more rapidly than at lower a(w).<h4>Conclusions</h4>Increased incidence of black Aspergillus spp. in dry soils and from grapes in dry conditions may result partly from prolonged survival of spores.<h4>Significance and impact of the study</h4>Delineating the direct effect of a(w) and temperature on survival of A. carbonarius spores may aid in understanding the incidence of this ochratoxin A-producing species in vineyard soils and on grapes.
Keywords: Aspergillus carbonarius
water activity
DOI: 10.1111/j.1472-765X.2006.01871.x
Appears in Collections:Agriculture, Food and Wine publications
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