Submitted to: APS Annual Meeting
Publication Type: Abstract only
Publication Acceptance Date: 6/1/2005
Publication Date: 6/1/2005
Citation: Jin, Y., Zhang, X., Anderson, J. 2005. Inheritance of Fusarium head blight resistance in Abura [abstract]. Phytopathology. 95:S49. Interpretive Summary:
Technical Abstract: Abura (PI 385140), a spring wheat line originating from Brazil, was selected for Fusarium head blight (FHB) resistance from the USDA wheat collection. In experiments of single floret inoculation, infection on Abura was mostly restricted to the inoculated spikelet. To investigate the inheritance of FHB resistance, we evaluated several generations from a cross between Abura and Wheaton (a susceptible spring wheat cultivar), including F1, BC1F2, F2, F4:5, and F5:6. The FHB severity in F1 and reciprocal F1 plants was 100%, indicating the recessiveness of the resistance. Among the 68 BC1F2 families tested, 40% were homozygous susceptible and 60% were segregating. The frequencies of resistant plants in the segregating families were low, ranging from 5 to 20%. The distribution of F2 (120 plants), F4:5, and F5:6 (97 lines) were skewed toward susceptibility, with nearly 70% of F4:5 and F5:6 lines having average FHB severity between 60 and 100%. Ten lines were homozygous resistant in both F4:5 and F5:6, fitting a three-gene model. These results suggested that three recessive genes, acting additively, condition FHB resistance in Abura.