Evaluation of Improvement Effect of Restorer Lines on Pyramiding Genes Resistant to Rice Blast, Bacterial Leaf Blight and Brown Planthopper Evaluation on Effect of Resistance Improvement of Rice Blast and Brown Planthopper for Three Dominant Indica Restorer Lines Developing Restorer Lines Pyramiding Different Resistant Genes to Blast and Bacterial Leaf Blight by Marker-assisted Selection in Rice Evaluation on Effect of Resistance Improvement of Bacterial Leaf Blight and Brown Planthopper for Three Dominant Indica Restorer Lines