Detection of Bacterial Leaf Blight Resistance Genes in Indigenous Glutinous Rice Landraces

Bacterial leaf blight disease (BLB) caused by Xanthomonas oryzae pv is one of the most widespread devastating diseases of rice worldwide. In this study, a total of 86 indigenous glutinous rice landraces were examined for BLB resistant genes included Xa4, xa5, and Xa7 by using molecular markers. The results indicated that 37 samples carrying resistant genes, in which Xa4 was found in 11 samples, xa5 determined in 6 samples, Xa7 was in 19 samples, respectively. However, both of Xa7 and Xa4 were observed in only one sample. The resistant level against 10 bacterial strains carrying the resistant genes was also evaluated. We found that the number 6, 9, and 8 out of the 10 bacterial strains were resistant to the landraces which carried the Xa4, xa5, and Xa7. The bacterial strain number 5 was revealed highly toxic, causing infection of all samples. The agronomical traits, yield and yield components of 37 rice landraces included the resistant genes (Xa4, xa5 and Xa7) were evaluated. Our findings may provide useful genetic sources in indigenous glutinous rice landraces to further develop BLB resistant rice lines via molecular breeding program.