稻瘟病持久抗性在三系杂交稻上的导入续报

Further Report on the Incorporation of the Rice Blast Durable Resistance into Hybrid Rice

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 。

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.