水稻品種 IR 50의 百葉枯病 抵抗性 遺傳子의 連關

Linkage analysis of genes related to bacterial blight resistance in rice cultivar IR 50

In order to indentify linkage group of resistant gene(s) of rice variety IR50 bred at IRRI to Bacterial Blight, IR50 was crossed with five genetic marker lines and F₂ plants of these crosses were inoculated by the inoculum of Pathotype Ⅰ and Ⅲ, from maximum tillering stage to flowering stage. The resistance of IR50 to Pathotype Ⅰ and Ⅲ appeared to be controlled by different single dominant gene, respectively. These two genes were linked each other with recombination value of 1.0 - 13.1%, but they were independently segregated with all the marker genes tested, such as, C, lg, Ph⁺, g, gh, Lh, la, bc, and gl which located on the linkage group Ⅰ, Ⅱ, Ⅳ, Ⅵ, Ⅶ, Ⅷ, XI, and XII, respectively.