Submitted to: Wheat Genetics International Symposium Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 9/1/2003
Publication Date: 9/1/2003
Citation: Garvin, D.F., Stack, R.W., Hansen, J.M. 2003. Genetic analysis of extreme Fusarium head blight susceptibility conferred by a wild emmer chromosome. Tenth International Wheat Genetics Symposium Proceedings, September 1-6, 2003, Paestum, Italy. p. 1139-1141.
Technical Abstract: Fusarium head blight (FHB) is a major disease of wheat in many regions of the world. A recent study (Stack et al., 2002) provided evidence for the existence of wheat genes that can increase FHB susceptibility, and we are investigating this topic in greater detail. Our results suggest that the extreme FHB susceptibility conferred by gene(s) on chromosome 2A from wild emmer line "Israel A" acts in an additive fashion. In contrast, we found that a major FHB resistance QTL on chromosome 3A of Israel A appears to be dominant. The F1 hybrids from a cross between durum-Israel A disomic chromosome substitution lines harboring either Israel A chromosome 2A or 3A exhibited FHB severity intermediate to these two lines, indicating that gene(s) on chromosome 2A suppress the chromosome 3A FHB resistance QTL. Analysis of FHB severity in individuals from an F2 population derived from this same cross revealed that individuals presumed to have the FHB resistance QTL exhibited an FHB severity frequency distribution similar to that expected if a single additive genetic factor conditioning FHB susceptibility was segregating in these individuals.