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

  Phan Huu Ton

  Date Received: 25-11-2016 / Date Accepted: 05-05-2016

   Abstract PDF (VIETNAMESE)

  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.

• Evaluation of Sticky Rice Genetic Resources for Resistance to Bacterial Leaf Light Disease

  Phan Huu Ton, Trịnh Thanh, Nguyen Van Giang, Nguyen Van Hung, Tong Van Hai

  Date Received: 11-07-2013 / Date Accepted: 25-09-2013 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  Bacterial leaf blight disease caused by Xanthomonas oryzae pv. oryzae is one of the most severe diseases that causes yield loss in Vietnam. Possession of genetic resources with resistance plays an important role in developing durable resistant varieties. In this study, we used DNA markers Npb181, P3 and RG556 to identify Xa4, Xa7 and xa5 genes, respectively, in 120 local sticky rice accessions. We found that 95/120 accessions have the resistant genes, of these 4 varieties were identified to carry xa5 gene, 19 varieties were identified to carry xa4, gene 82 varieties with Xa7 gene, and 10 varieties with both Xa4 and Xa7 genes. Different genes resist to different number of bacterial strains. Two strains 4 and 5 are highly virulent, even causing disease on accessions containing the efective resistant genes (Xa4, xa5 or Xa7). 18 accessions that showed good esistance and high yield potential were selected. These materials can be used for rice breeding program with high yield  and bacterial leaf blight resistance.

  DOI: https://doi.org/10.31817/tckhnnvn.2013.11.6.