水稻 耐病 耐蟲 耐冷性 品種育成에 關한 硏究 1. 水稻 IR2061 의 흰빛잎마름病 抵抗性의 遺傳

Studies on the Breeding of Rice Cultivars Resistant to Diseases, Insects and Cold Weather. Ⅰ. Inheritance of Bacterial Leaf Blight Resistance Derived from Cultivar IR2061-214-2 in Rice

The resistance to the bacterial leaf blight derived from cultivar IR2061-214-2 in rice was controlled by a single dominant gene, and it was located in linkage group II of Nagao and Takahashi. It was independent from the semi-dwarf plant type and resistance to brown plant hopper and smaller brown plant hopper which are not identified their linkage relations yet. To assure the inheritance of the resistance to the bacterial leaf blight(Xanthomonas oryzae) derived from cultivar IR2061-214-2 and 7 linkage tester lines. The cultivar IR2061-214-2 is a semi-dwarf line resistant to brown plant hopper (Nilaparvata lugens) and smaller brown plant hopper(Laodelphax striatellus). Their F₁s and F₂s were grown along thir parents, and the segregation of the characters were studied. The results are summarized as follows: 1. The resistance to the bacterial leaf blight derived from cvltivar IR2061-214-2 inherits as coutrolled by a single dominant gene. 2. The resistance (Xa) showed linkage with the characters such as phenol staining (Ph), liguless (lg) and the complementary gene of purple pericarp (Pb) with the recombination values of 6.1%, 8.1% and 34.3% respectively. The serial loci are estimated as in the order of Pb-lg-Ph-Xa. 3. The resistance to the bacterial leaf blight was independent from the semi-dwarf plant type. 4. The resistance to the bacterial leaf blight was also independent from the resistance to the brown plant hopper and smaller brown plant hopper.