Fusarium head blight (FHB) is a serious disease of wheat, primarily caused by the pathogen Fusarium graminearum. FHB results in yield losses and decreased grain quality due to the ability of the pathogen to produce the mycotoxin deoxynivalenol (DON) as well as acetylated derivatives of DON such as 3-acetyl DON (3-ADON) and 15-acetyl DON (15-ADON). Research shows that the 15-ADON chemotype is being replaced by the 3-ADON chemotype in eastern and central Canada. The first study investigated the potential for differences between the two chemotypes in terms of disease progression, effect on yield, Fusarium damaged kernels (FDK) and DON levels. Results showed that 3-ADON isolates were able to produce significantly more DON and FDK, and had significantly greater negative effects on yield than 15-ADON isolates, although there were no differences in symptom disease progression. The second study investigated if there were differences in resistance for the two chemotypes on 3BS and 4B quantitative trait loci (QTL) lines for disease severity and FDK levels. No differences were detected between chemotypes for disease progression but there were for FDK levels. One 3BS line was identified as partially resistant with significantly lower disease severity and FDK levels than the other QTL and null lines.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:MWU.1993/4359 |
| Date | 18 January 2011 |
| Creators | Gauthier, Victoria Margot |
| Contributors | Brule-Babel, Anita (Plant Science), Fernando, Dilantha (Plant Science) Gilbert, Jeannie (Biological Sciences) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | en_US |
| Detected Language | English |
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