A comparison of aggressiveness and deoxynivalenol production between Canadian <Emphasis Type="Italic">Fusarium graminearum</Emphasis> isolates with 3-acetyl and 15-acetyldeoxynivalenol chemotypes in field-grown spring wheat |
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Authors: | Christiane von der Ohe Victoria Gauthier Lily Tamburic-Ilincic Anita Brule-Babel W G Dilantha Fernando Randy Clear Todd J Ward Thomas Miedaner |
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Institution: | (1) State Plant Breeding Institute, Universitaet Hohenheim, 70599 Stuttgart, Germany;(2) Department of Plant Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada;(3) Department of Plant Agriculture, University of Guelph, Ridgetown, Ontario N0P 2C0, Canada;(4) Grain Research Laboratory, Canadian Grain Commission, Winnipeg, MB R3C 3G8, Canada;(5) Bacterial Foodborne Pathogens and Mycology Research Unit, United States Department of Agriculture - Agriculture Research Service, Peoria, IL 61604, USA; |
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Abstract: | Twenty four isolates of Fusarium graminearum, half of which were 3-acetyldeoxynivalenol (3-ADON) and half 15-acetyldeoxynivalenol (15-ADON) chemotypes, were tested for
their ability to produce deoxynivalenol and to cause Fusarium head blight (FHB) in spring wheat cultivars. The objectives
of this study were to determine (1) whether 3-ADON isolates differ in aggressiveness, as measured by the FHB index, and DON
production from 15-ADON isolates under field conditions, and (2) whether the performance of resistant host cultivars was stable
across isolates. Field tests of all isolates were conducted with three replicates at each of two locations in Canada and Germany
in 2008 with three host genotypes differing in FHB resistance level. The resistant host genotype showed resistance regardless
of the chemotype or location. The differences between mean FHB indices of 3-ADON and 15-ADON isolates were not significant
for any wheat genotype. In contrast, average DON production by the 3-ADON isolates (10.44 mg kg−1) was significantly (P < 0.05) higher than for the 15-ADON isolates (6.95 mg kg−1) at three of the four locations where moderately resistant lines were tested, and at both locations where susceptible lines
were evaluated. These results indicate that 3-ADON isolates could pose a greater risk to food safety. However, as the mean
aggressiveness and DON production of 3-ADON and 15-ADON chemotypes was similar on highly resistant lines, breeding and use
of highly resistant lines is still the most effective measure of reducing the risks associated with DON in wheat. |
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