【摘要】 用低O₂,低CO₂、光强269μE·m^-2·s（-1）的人工光氧化条件处理水稻叶片,观察了不同耐光特性品种叶片的光合速率、叶绿素含量及其组份和活性氧清除系统的差异。结果表明,不同光氧化耐性的水稻品种比较,以耐光氧化的品种受影响较小。光氧化条件下叶片活性氧清除系统中的超氧物歧化酶、过氧化物酶活性及类胡萝卜素和抗坏血酸水平降低,而膜脂过氧化作用加强。处理4～8天,不同品种间以耐光氧化品种的保护酶活性、抗光氧化物质水平下降及丙二醛含量上升的幅度较小。更多还原

【Abstract】 Under controlled low O2, low CO2 and light intensity of 269 μE·m-2·s-2,the differences of photosynthetic oxygen evolution (Pn), chlorophyll (chl) content and its components , and the scavenging system of active oxygen in detached rice leaves with different sensibility to photooxidation were studied. The results showed that the activities of superoxide dismutase(SOD) and peroxidase(POX) , contents of carotenoid and ascorbic acid (ASA) decreased duringthe period of photooxidation, but the lipid peroxidation was intensified. After 4~8 days of pho-tooxidative treatment, a less reduction in activities of photoprotective enzymes and contents ofrelative antioxidants associated with less increase of malondialdehyed(MDA) content in the pho-tooxidation-tolerant variety was found.更多还原