Resistance of Local Rice Varieties, Deo Dang, Pude, Blechau and Khau Dao to Bacterial Leaf Blight, Blast Disease and Brown Plant Hopper

Abstract

      Vietnam is one of the centers of rice with rich genetic resource. Especially, in Vietnam exists a lot of local rice varieties carrying resistance genes that are unique materials for breeding work. In this study the resistance of four local varieties to bacterial blight and blast and brown plant hopper was investigated by artificial innoculation using 10 strains of bacterial leaf blight, three isolates of blast fungi and two hopper populations. The resistance genes in 4 cultivars were identified by using DNA markers, MP2, P3, YL155/YL87 and RG457L to detect Xa4, Xa7, Pi-ta and Bph10 resistance genes, respectively. The results showed that cv Blechau contains three genes Xa4, Xa7 and Pi-ta, while cv. Khau dao contains Xa4 and Bph10 genes, sticky ricecv. Deo dang has Xa7 and Pi-ta genes and Pude cultivar has Xa4 and Bph10 resistance genes. The cultivars containing Xa4, Xa7, Pi-ta and Bph10 genes also showed strong resistance to the tested strains of bacterial leaf blight and blast disease and two brown planthopper populations, respectively.