Study on Rice Breeding Resistant to Brown Planthoper (Nilaparvata Lugens Stål) in Mekong Delta, Vietnam

The brown planthopper (BPH) is the most serious pest threat to rice production throughout Asia. The materials including 23 varieties and 13 of BC1F1 populations were evaluated for the screening of BPH. The germplasm was screened for BPH following standard of IRRI in the greenhouse. Twenty-three (23) varieties also were used to evaluate the cluster diagram based on by phenotype. The phenotypic evaluation showed a clear distinction between resistant and susceptible type by clearly revealing moderately resistant types as well. From the total of 23 varieties screened, the results showed varieties with good resistance (OM6619, OM6062, OM5239, AS996, OM4498, OM4495). The marker VL3,4 linked to BPH resistance from the nine of BC1F1 combinations. The closely linked marker identified in this study should be useful in marker-assisted breeding to produce BPH resistant cultivars. The combined use of phenotypic and genotypic evaluation methods can improve the productivity of marker-assisted selection and application for resistant genotypes for crop development by rice breeders.