biostudies-literatureUnknown13Hay WTFusarium head blight, a devastating cereal crop disease, can cause significant yield losses and contaminate grain with hazardous fungal toxins. Concerningly, recent evidence indicates that substantial grain protein content loss is likely to occur in wheat that is moderately resistant to head blight when it is grown at elevated CO₂. Although wheat breeders in North America utilize a number of resistance sources and genes to reduce pathogen damage, the <i>Fhb1</i> gene is widely deployed. To determine whether <i>Fhb1</i> is associated with the protein content loss at elevated CO₂, twelve near-isogenic spring wheat lines from either a susceptible or moderately susceptible genetic background, and with, or without the <i>Fhb1</i> QTL, were grown at ambient and elevated CO₂ conditions. The near-isogenic lines were evaluated for differences in physiology, productivity, and grain protein content. Our results showed that the <i>Fhb1</i> QTL did not have any significant effect on plant growth, development, yield, or grain protein content at ambient or elevated CO_2. Therefore, other factors in the moderately susceptible wheat genetic background are likely responsible for the more severe grain protein loss at elevated CO₂.Frontiers in plant science1034406https://www.ebi.ac.uk/biostudies/studies/S-EPMC9742602biostudies-literature<i>Fhb1</i> disease resistance QTL does not exacerbate wheat grain protein loss at elevated CO₂.PMC9742602Hay WTGarvin DFMcCormick SPAnderson JAVaughan MMfalse<i>Fhb1</i> disease resistance QTL does not exacerbate wheat grain protein loss at elevated CO₂.Fusarium head blight, a devastating cereal crop disease, can cause significant yield losses and contaminate grain with hazardous fungal toxins. Concerningly, recent evidence indicates that substantial grain protein content loss is likely to occur in wheat that is moderately resistant to head blight when it is grown at elevated CO₂. Although wheat breeders in North America utilize a number of resistance sources and genes to reduce pathogen damage, the <i>Fhb1</i> gene is widely deployed. To determine whether <i>Fhb1</i> is associated with the protein content loss at elevated CO₂, twelve near-isogenic spring wheat lines from either a susceptible or moderately susceptible genetic background, and with, or without the <i>Fhb1</i> QTL, were grown at ambient and elevated CO₂ conditions. The near-isogenic lines were evaluated for differences in physiology, productivity, and grain protein content. Our results showed that the <i>Fhb1</i> QTL did not have any significant effect on plant growth, development, yield, or grain protein content at ambient or elevated CO_2. Therefore, other factors in the moderately susceptible wheat genetic background are likely responsible for the more severe grain protein loss at elevated CO₂.2022-01-01T00:00:00Z20222024-10-19T06:45:03.002Z2024-10-19T06:45:03.002ZS-EPMC97426023651851310.3389/fpls.2022.1034406