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HOME > J. Microbiol > Volume 50(1); 2012 > Article
Research Support, Non-U.S. Gov't
Heat- and Cold-Shock Responses in Fusarium graminearum 3 Acetyl- and 15 Acetyl-Deoxynivalenol Chemotypes
Vladimir Vujanovic , Yit Kheng Goh , Prasad Daida
Journal of Microbiology 2012;50(1):97-102.
DOI: https://doi.org/10.1007/s12275-012-1381-5
Published online: February 27, 2012
Department of Food and Bioproduct Sciences, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada
Corresponding author:  Vladimir Vujanovic , Tel: +306-966-5048, 
Received: 3 August 2011   • Accepted: 7 October 2011
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Abstract

Fusarium graminearum Schwabe is the primary cause of Fusarium head blight (FHB) in North America. Chemically distinct F. graminearum sub-populations can be identified based on the type or composition of deoxynivalenol (DON) mycotoxin derivatives, including 3-acetyl (3-ADON) and 15-acetyl (15-ADON). The evaluation of randomly selected 3-ADON and 15-ADON isolates, collected from spring wheat throughout Canada, was performed using thin layer chromatography (TLC), high-performance liquid chromatography (HPLC), ice-nucleation activity (INA), and heat and cold tolerance tests conducted within a temperature range of -70°C to 65°C. The results indicated that the 3-ADON sub-population, which is responsible for the highest disease severity and has rapidly displaced the 15-ADON sub-population, produces more DON and zearalenone (ZEA) than the 15-ADON sub-population when exposed to heat and cold. Following exposures (1 and 2 h) to extremely high or low temperatures, 3-ADON isolates exhibited faster mycelial growth than 15-ADON isolates. In addition, the warmest temperature at which INA activity occurred was in 3-ADON (-3.6°C) vs. 15-ADON (-5.1°C). Taken together, these features suggest that the newly emerging 3-ADON sub-population is more resilient than the resident 15-ADON sub-population. Overall, the differences between the two sub-populations could provide new insights into FHB epidemiology and if validated under field conditions, may provide important information for predicting future FHB epidemics.

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    Heat- and Cold-Shock Responses in Fusarium graminearum 3 Acetyl- and 15 Acetyl-Deoxynivalenol Chemotypes
    J. Microbiol. 2012;50(1):97-102.   Published online February 27, 2012
    DOI: https://doi.org/10.1007/s12275-012-1381-5
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