Androgenic response of barley accessions and F1s with<Emphasis Type="Italic"> Fusarium</Emphasis> head blight resistance

Most Fusarium head blight (FHB) resistant barley (Hordeum vulgare L.) accessions perform relatively poorly from an agronomic point of view. Due to the polygenic inheritance of FHB resistance, introgression of this complex trait into well-adapted elite germplasm will likely require multiple cycles of hybridization and selection to combine resistance and agronomic performance. The use of anther culture to produce doubled haploids would seem well justified to reduce the time required to achieve this goal. Unfortunately, little is known concerning the androgenic response of the small number of genotypes with known partial FHB resistance. To make the best use of such FHB resistance donors in a barley improvement program, we first characterized the FHB resistance of eight reported FHB resistance sources (Chevron, Gobernadora, Seijo II, Shyri, Svanhals, Zhedar I, F104-250-9 and C97-21-38-3) in our own FHB nursery in Quebec City (QC, Canada). In parallel, we assessed the androgenic response of these same eight lines with that of three cultivars (ACCA, Léger and Cadette) of known androgenic response. Finally, the androgenic response of F₁ hybrids involving some of these genotypes used as parents was measured and compared to that of the parental genotypes. Very large and significant differences were observed in the number of green plants produced by the different accessions and F₁s. Although anther culture seemed very promising for some accessions, for others, the androgenic response was so low that a conventional approach would seem more appropriate.