T. Thanh, P.H. Ton, V.D. Hai, N.T. Luong, T.V. Hai, P.B. Hien, L.T. Nghia, D.M. Trung, N.T. Duong, K.H. Trung, Tran Dang Khanh, Detection of Bacterial Leaf Blight Resistance Genes in Indigenous Glutinous Rice Landraces, JHPR Volume 2, Journal of Horticulture and Plant Research (Volume 2)
https://www.scipress.com/JHPR.2.1
Abstract:
    Bacterial leaf blight disease (BLB) caused by <i>Xanthomonas oryzae</i> 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 <i>Xa4, xa5,</i> and <i>Xa7</i> by using molecular markers. The results indicated that 37 samples carrying resistant genes, in which <i>Xa4</i> was found in 11 samples, <i>xa5</i> determined in 6 samples, <i>Xa7</i> was in 19 samples, respectively. However, both of <i>Xa7</i> and <i>Xa4</i> 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 <i>Xa4</i>, <i>xa5</i>, and <i>Xa7</i>. 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 (<i>Xa4, xa5</i> and <i>Xa7</i>) 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.
Keywords:
    Blight Leaf Blight, Glutinous Rice Landraces, Resistant Genes, Xa4 Gene, Xa5 Gene, Xa7 Gene