Fuente: WIPO "tomato" The present invention relates to the technical field of biology, and specifically relates to the use of a SIABCG45 gene in improving the Orobanche and Phelipanche resistance and yield of tomatoes. Provided is a method for improving the Orobanche and Phelipanche resistance and tomato yield of a tomato plant in an Orobanche and Phelipanche parasitic environment. The method comprises: reducing the content of a SIABCG45 protein in a tomato plant or inhibiting the expression of a coding gene of the SIABCG45 protein in the tomato plant, wherein the amino acid sequence of the SIABCG45 protein is as shown in SEQ ID NO: 3. By using the method, the balance between the Orobanche and Phelipanche parasitic resistance and the growth and development of the tomato plant can be achieved, thereby significantly improving the yield of tomatoes in the Orobanche and Phelipanche parasitic environment.