Browsing by Author "Hughes, G."
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Item Fusarium head blight in Saskatchewan (1998-2000)(2001-02-22) Fernandez, M.R.; Pearse, P.; Holzgang, G.; Hughes, G.; Clear, R.Item Fusarium head blight in Saskatchewan (1998-2001)(2002-02-20) Fernandez, M.R.; Pearse, P.G.; Holzgang, G.; Hughes, G.; Clear, R.Province-wide surveys were conducted in Saskatchewan for the last few years to monitor the development of Fusarium head blight (FHB) and determine the Fusarium spp. involved. These field surveys were supported by Agriculture Development Fund and conducted with the assistance of extension agrologists, Saskatchewan Agriculture and Food. Seed surveys for Fusarium damaged kernels (FDK) have been conducted by the Canadian Grain Commission with grain samples obtained from across Saskatchewan.Item Fusarium head blight in Saskatchewan in 1998(1999-02-25) Fernandez, M.R.; Holzgang, G.; Hughes, G.; Clear, R.Item Fusarium head blight in wheat and barley in Saskatchewan (1998 and 1999)(2000-02-22) Fernandez, M.R.; Pearse, P.; Holzgang, G.; Hughes, G.Item Identification of intergeneric and synthetic spring wheat lines with resistance to Fusarium head blight(2004-02-19) Breker, E.; Hucl, P.; Hughes, G.Fusarium head blight (FHB) is a serious disease in many cereal crops worldwide, as it can drastically reduce both yield and quality in infected crops. Resistance to FHB is therefore a desirable trait for incorporation into new wheat cultivars. Wild relatives are a source of new genetic variation and have been shown to enhance disease resistance when hybridized with wheat. This research has focused on evaluating intergeneric and interspecific wheat lines for resistance to FHB. Intergeneric hybrids of wheat (Triticum aestivum) and Agropyron repens syn. Elytrigia repens, and synthetic wheat lines produced at CIMMYT, were evaluated under greenhouse conditions for resistance to FHB caused by Fusarium graminearum. Approximately 35% of the intergeneric lines and 15% of the synthetic lines consistently displayed moderate to high levels of Type II resistance. Pollen staining was conducted to determine the fertility levels of the intergeneric lines. 79% of the F3 lines and 72% of the F5 and F6 lines displayed fertility levels above 75%. Control cultivars displayed fertility levels ranging from 88-94%. Generally, lines that rated as moderately to highly resistant were also highly fertile. These lines could be of significant value in wheat breeding programs aimed at integrating new sources of resistance to Fusarium head blight.Item Identification of new sources of resistance to tan spot of wheat(2003-02-18) Singh, P.K.; Hughes, G.R.Tan spot, caused by Pyrenophora tritici-repentis, is a major foliar disease of wheat in western Canada. Isolates of P. tritici-repentis are presently classified into 11 races based on their virulence on a set of wheat differential cultivars. In western Canada only 5 of these races have been identified. More than 1000 accessions of wheat including synthetics and wild relatives were evaluated for resistance against all the virulent races of P. tritici-repentis that are prevalent in western Canada. Disease screening was done under controlled environmental conditions at the seedling stage. High level resistance to P. tritici-repentis was observed in some accessions of Triticum monococum, T. turgidum, T. dicoccum, T. dicoccoides, T. timopheevii, and T. aestivum including synthetic wheat. These accessions also showed good resistance to the leaf spot disease stagnospora nodorum blotch. They will be studied further to determine the genetic basis of resistance and to transfer their resistance to adapted wheat and durum cultivars.