Jurnal AgroBiogen

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Browsing Jurnal AgroBiogen by Subject "Bacterial leaf blight, Xanthomonas oryzae pv. oryzae (XOO), resistant varieties, resistant genes."

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    Penyakit Hawar Daun Bakteri pada Padi Sawah: Masalah dan Pemecahannya
    (Balai Penelitian Bioteknologi Tanaman Pangan, 1996) Hifni, H. R. ...[at al]; Balai Besar Penelitian dan Pengembangan Bioteknologi dan Sumberdaya Genetik Pertanian
    AHBifSnTi,R HA.C RT., S. Mihardja, E. Soetarwo, Yusida, dan M. K. Kardin. 1996. Bacterial Leaf Blight Disease of Rice: Problems and Prospects of Disease Control Using Resistant Varieties. Buletin AgroB/o 1(1) 19-23. Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (XOO) is one of the most important diseases of lowland rice in Indonesia and in other rice growing countries. At present, the recommended control measures of BLB in Indonesia are by growing resistant rice varieties and by avoiding excessive application of nitrogen fertilizer. The presence of variation of virulence among XOO isolates, however, becomes a limitting factor in controlling BLB using resistant varieties. Using Kozaka's system of XOO classification, at least 11 strain of XOO have been identified in Indonesia. In 1970s, strain III of XOO were the most dominant strain in Indonesia, so that this strain was extensively used in our breeding program to select new high yielding rice varieties which are resistant to BLB. Recent studies suggested that strain IV, the most virulent strain of XOO in Indonesia, was found to dominate the XOO population. IRRI isogenic lines possessing the xa-5, Xa-7, and Xa-21 resistant genes, and several local varieties with unknown resistant gene(s) are still effective against strain IV, so that the resistant genes found in these lines/varieties have been recommended to be incorporated in our rice breeding program in a multi-lines fashion. A small fraction of XOO population from West Java has been identified to have the capability to overcome all known resistant genes to XOO. Therefore, pyramiding of xa-5, Xa-7, and Xa-21 in a single genetic background is not recommended, since it will enhance the population build-up of this XOO population. The prospect of using advanced molecular techniques to control BLB is briefly discussed.