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中文摘要：
研究了不同UV-C辐射时间对豌豆幼苗光合特性及抗氧化酶活性的影响。结果表明，UV-C辐射增强使叶片光合速率减弱，气孔导度、胞间CO2浓度、蒸腾速率和羧化效率明显降低，CO2补偿点升高。随着UV—C辐射时间的延长，POD和CAT活性先升高随后降低，SOD活性、叶绿素含量则逐渐降低，但丙二醛含量逐渐增加。这说明UV-C辐射增强引起抗氧化酶活性降低，使膜脂过氧化，导致光合作用减弱。
英文摘要：
Effects of duration of UV-C radiation on photosynthetic characteristics and activity of antioxidant enzyme in pea seedlings were studied. Results show that Enhanced UV-C radiation significantly decreased photosynthesis rate（ P. ）, stomatal conductance （ Gs ） ,intercellular CO2 concentration （ Ci ） , transpiration rate （Etr ） and carboxylation efficiency （ CE ）. Prolonged duration of UV-C radiation increased the activities of POD and CAT, which soon declined, and kept the activity of SOD, and the content of chlorophyll gradually going down, but the content of MDA going up. The results suggest that enhanced UV-C radiation decreased activities of the antioxidant enzymes and made membrane peroxidated, thus leading to weakened photosynthesis.
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