Abstract: By crossing two durably resistant cultivars (Sanhuangzhan 2, Sanluzhan 7), and two resistant cultivars (Wai xuan 35, Aisanluzhan), with two popular sterile lines susceptible to rice blast (Guang A,Bo A), their hybrid rice combinations were studied with respect to qualitative resistance, quantitative resistance and field resistance in different blast conducive areas. Results indicated that the combinations with durably resistant donor showed the same durably resistant characteristics as correspondingly durably resistant cultivars. Quantitative resistance and field resistance in different blast conducive areas could be as indicators of durability of resistance. Quantitative resistance was closely related to field resistance in different blast conducive areas, and might be an important indicator of durable resistance to blast. These results suggested that it would be possible to breed for durable resistance to rice blast by means of selecting quantitative resistance which could be tested under artificial inoculation in greenhouse.

Key words: rice blast, durable resistance, quantitative resistance, hybrid rice, breeding

摘要： 选用稻瘟病持久抗性载体品种三黄占２号、三芦占7号，稻瘟病抗性品种外选35和矮三芦占等4个品种，与广A、博A两个不育系配组8个组合，重复进行了详细的稻瘟病抗谱测定、数量抗性测定以及不同病区田间异地同步抗性鉴定，结果表明：（１）三黄占２号、三芦占7号携带的稻瘟病持久抗性基因能在三系杂交稻组合中表达出来，杂交稻的持久抗性育种是可能的；（2）与常规稻类同，数量抗性和不同病区田间异地同步抗性可作为区分杂交稻是否具有持久抗性的指标；（3）数量抗性与不同病区田间异地同步抗性紧密正相关，数量抗性可作为区别高质量抗性组合是否具有持久抗性的重要依据，可以应用温室人工鉴定的数量抗性指标开展稻瘟病持久抗性育种探索。

关键词: 稻瘟病, 持久抗性, 数量抗性, 杂交水稻, 育种