‘Fuhui 631’, a novel hybrid rice restorer line with multiple resistance genes, high combining ability, and superior grain quality developed with marker‑assisted breeding

Rice (Oryza sativa L.) Restorer line Marker-assisted selection Disease-resistance Grain quality 'Fuhui 631' is a novel indica rice restorer line developed through marker-assisted pyramiding of multiple resistance genes and officially released by Rice Research Institute, Fujian Academy of Agricultural Sciences in 2022.It combines high yield potential, strong combining ability, lodging resistance, heat tolerance, and superior grain quality, representing a significant advance over existing restorer lines.Given the increasing challenges of extreme weather and disease pressure in rice production, there is an urgent need for restorer lines that integrate multiple stress resistances with high combining ability and premium grain quality.Statistical comparisons with the widely grown control variety 'Jingliangyou 534' confirmed that 'Fuhui 631' exhibits significantly higher resistance to blast (moderately resistant, MR) and bacterial blight (p < 0.01), improved heat tolerance (level 5, moderate, according to NY/T 2915 -2016) (p < 0.05), and superior grain quality traits including lower chalkiness (1.6%) and higher head rice rate (61.3%) (p < 0.05).These enhancements provide