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Isolation of Mutants Susceptible to Rice Blast from DEB-treated Rice Population  

Kim, Hye-Kyung (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University)
Lee, Sang-Kyu (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University)
Han, Mu-Ho (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University)
Jeon, Yong-Hee (National Institute of Crop Sciences, Rural Development Administration)
Lee, Gi-Hwan (Yeongnam Agricultural Research Institute, National Institute of Crop Science, Rural Development Administration)
Lee, Youn-Hyung (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University)
Bhoo, Seong-Hee (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University)
Hahn, Tae-Ryong (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University)
Jeon, Jong-Seong (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University)
Publication Information
Applied Biological Chemistry / v.48, no.4, 2005 , pp. 339-344 More about this Journal
Abstract
Rice blast, which is caused by the fungus Magnaporthe grisea, is one of the most destructive diseases of rice. To identify genes involving in the signal transduction pathways that mediate rice blast resistance, we screened over 2,000 mutant lines of a highly resistant variety RIL260 that were generated by using a DEB (1, 3-Butadiene diepoxide) treatment method. In the mutant population, the frequency of albino plants was 6.7%, indicating that this population has a high frequency of mutations in the genome. The primary screening identified 29 mutant plants that exhibit a complete or partial loss of the resistance to rice blast. Among them, M5465, the most susceptible line, was subsequently examined by DNA gel-blot experiments using DNA molecular markers of Pi5(t) that has been previously identified as a durable resistance locus in RIL260. The result revealed that a large deletion and rearrangement of genomic DNA occurred in the Pi5(t) locus. The results suggest that DEB can be used as an efficient mutagen to induce large scale mutations in the rice genome. The isolated mutants should be useful for elucidating the Pi5(t)-mediated signaling pathways of rice blast resistance.
Keywords
Oryza sativa; Magnaporthe grisea; DEB; mutant; Pi5(t);
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