Fuente: WIPO "tomato" Provided are an RSB11 superior allelic variant RSB11-R and an application thereof in improving rice sheath blight resistance. Also provided is a DNA molecule (an RSB11 superior allelic variant RSB11-R promoter), the nucleotide sequence thereof being as shown in SEQ ID NO: 4. The RSB11 superior allelic variant RSB11-R is transferred into the conventional japonica rice variety, and an improved rice plant with significantly enhanced sheath blight resistance can be obtained, which has important significance for genetic improvement of rice sheath blight resistance.