Comparison of infection with Fusarium head blight and accumulation of mycotoxins in grain of hulless and covered barley |
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| Institution: | 1. Research Scientist, Alberta Environment and Parks, Land and Forest Policy Division, AB, Canada;2. Mattheis Chair, Department of Agricultural, Food and Nutritional Science, 4–10 Agriculture/Forestry Centre, University of Alberta, AB, Canada;3. Research Scientist, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada;1. Infectious Diseases Department, Rouen University Hospital, GRAM (EA2656), Rouen, France;2. Infectious Diseases Department, Rouen University Hospital, Rouen, France;3. Microbiology Department, Rouen University Hospital, GRAM (EA2656), Rouen, France;4. Geriatrics Department, Rouen University Hospital, Rouen, France;5. Urology Department, Rouen University Hospital, Rouen, France;1. University of Texas Health Science Center San Antonio San Antonio, TX;2. South Texas Veterans Healthcare, TX;3. University of Washington, WA;4. Department of Microbiology, University of Texas Health San Antonio, TX |
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| Abstract: | We have evaluated 145 covered and 29 hulless barley genotypes artificially infected with Fusarium graminearum Schw. in a field experiment. Significant genetic variation for Fusarium head blight severity measured by the area under the disease progress curve and for mycotoxin contamination was found among covered and hulless barley lines. The overall mean area under the disease progress curve of covered and hulless barley did not differ significantly. Twenty-nine hulless-covered pairs with approximately the same disease severity were chosen for analysis of mycotoxins (B-trichothecenes) in the harvested grain. The average content of deoxynivalenol of the 29 covered and 29 hulless barley samples was 15,520 and 12,964 μg kg−1, respectively. The mean deoxynivalenol, 3-acetyl-deoxynivalenol and 15-acetyl-deoxynivalenol content of covered barley was significantly higher than that of hulless barleys (p<0.01), whereas for nivalenol there was no significant difference between the mean values of covered and hulless barley. Hulless barley appears to be less prone to accumulation of mycotoxins in the harvested crop than covered barley most likely because a considerable proportion of the mycotoxin resides in the barley hulls. |
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