Abstract: The difference of photooxidation in various rice varieties under condition of inducing photooxidation was studied. The results indicated that indica-japonica hybrid rice Yayou 2, japonica rice 02428 and Niujiaobiannuo were more tolerant to photooxidation than indica hybrid rice Shanyou 63 and indica rice 3037 and Mars. Under condition of inducing photooxidation chlorophyll (Chl) content and Chl a/b declined slower, and carotenoid (Car) content as endogenous active oxygen scavenger was higher, higher superoxide dismutase (SOD) activity was induced and lasted longer in tolerant varieties. Nitrogen deficit and shading treatment exacerbated the degradation of Chl and Chl content, and increased the photooxidation damage. The exogenous active oxygen scavengers i. e. ascorbate (ASC), 8- hydroxoy-quinoline (8-HQ) and mannitor (MT) keeped higher SOD activity, lowered the degradation of Chl content and Chl a/b and photooxidation damage under condition of inducing photooxidation.

Key words: Active oxygen scavengers, Photooxidation, Photosynthetic pigment, Superoxide dismutase

关键词: 活性氧清除剂, 水稻, 品种, 光氧化