Abstract: To elucidate the tolerance of photoinhibition and herbicide DCMU in indica, japonica and physiological genetic in reciprocal hybrids F₁,Three reciprocal crosses involving indica varieties 3037, Palghar and japonica varieties 02428, 029 were used for this study. Results showed that tolerance of photoinhibition was paralleled with DCMU affinity of PSⅡ(Ⅰ₅₀), japonica was more than indica, indicating japonica was tolerant to photoinhibition and DCMU. Hybrids F₁ were based towards(or similar) their materal parents. Selecting variety with tolerating photoinhibition and DCMU (higher Ⅰ₅₀)as material might be an important approach in rice breeding.

Key words: herbicide, photoinhibition, physiological genetics, photosynthesis

摘要： 以籼稻3037、Palghar和粳稻029、02428及其正反交F₁为材料，探讨水稻籼粳亚种对光抑制和DCMU的耐性及其在杂种F₁中的生理遗传特点。结果表明，亲本及正反交F₁的PSⅡ活性对光抑制和除草剂的耐性基本上是一致的。粳稻大于籼稻，籼粳杂种F₁分别与其母本相似。在育种上选用耐光抑制和DCMU（I₅₀较高）的品种作母本是水稻生理育种中选亲配组的重要着眼点之一。

关键词: 光合作用, 光抑制, 生理遗传