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Brown planthopper(Nilaparvata lugens St?l) is one of the most damaging pests causing hopper burn in rice,and thereby reducing the productivity and also the quality of the product.The effective management strategy to control this pest is the identification and transfer of desirable genes to local rice cultivars.The most important approach for developing resistant cultivars is the identification of markers,which can help in marker-assisted selection of more durable resistant genotype.The susceptible parent IR50 and the resistant parent Ptb33,and their F2 populations were used in bulked segregant analysis for identification of resistant genes with random amplified polymorphic DNA marker(RAPD) primers.The primers OPC7 and OPAG14 showed both dominant and susceptible specific banding pattern so called co-dominant markers.Moreover,OPC7697 and OPAG14680 showed resistant specific bands and thus being in coupling phase,whereas OPC7846 and OPAG14650 showed susceptible specific genotypic bands in bulked segregant analysis.Therefore,the coupling phase markers,OPC7697 and OPAG14680,are considered to be more useful in marker-assisted selection of rice genotypes in crop improvement.
Brown planthopper (Nilaparvata lugens St? L) is one of the most damaging pests causing hopper burn in rice, and thereby reducing the productivity and also the quality of the product. Effective method to control this pest is the identification and transfer desirable genes to local rice cultivars. the most important approach for developing resistant cultivars is the identification of markers, which can help in marker-assisted selection of more durable resistant genotypes. The susceptible parent IR50 and the resistant parent Ptb33, and their F2 populations were used in bulked segregant analysis for identification of resistant genes with random amplified polymorphic DNA marker (RAPD) primers. The primer OPC7 and OPAG14 showed both dominant and susceptible specific banding patterns so called co-dominant markers. Moreover, OPC7697 and OPAG14680 showed resistant specific bands and thus being in coupling phase, but OPC7846 and OPAG14650 showed susceptible specific genotypic bands in bulked segregant analysis. Before, the coupling phase markers, OPC7697 and OPAG14680, are considered to be more useful in marker-assisted selection of rice genotypes in crop improvement.