紫外光B辐射增强对小白菜膜脂质过氧化作用的影响

小白菜品种矮脚黄生长在光照培养室内，在以０．０、１３．０ｋＪｍ＾－２ｄ＾－１（模拟氧浓度下降２０％时的ＵＶ－Ｂ强度）的紫外光Ｂ（ＵＶ－Ｂ２８０－３２０ｎｍ）进行４ｄ与７ｄ的照射处理，研究ＵＶ－Ｂ对小白菜叶片内的类黄酮和膜脂质过氧化作用的影响。研究结果表明，ＵＶ－Ｂ辐射诱导了小白菜叶内吸收ＵＶ的类黄酮化合物的积累。同时ＵＶ－Ｂ辐射降低小白菜叶片内抗坏血酸的含量，１３．０ｋＪｍ＾－２ｄ＾－１的ＵＶ－Ｂ

Influence of Supplemental Ultraviolet B Radiation on Lipid Peroxidation of Chinese Cabbage

Chinese cabbage cultivar Aijiaohuang was grown in an indoor experiment treated by 0.0,13.0(simulating 20% ozone depletion)kJ m -2 day -1 of ultraviolet B(UV B)for 4 and 7 days to study the effect of supplemental UV B radiation on flavoniods and lipid peroxidation in the leaves of Chinese cabbage.Accumulation of UV absorbing flavonoids in the leaves of Chinese cabbage was induced by UV B radiation.Enhanced UV B radiation reduced ascorbic acid content in the leaves of Chinese cabbage .It was also found that 13.0 kJm -2 day -1 UV B inhibited catalase and superoxide dismutase activities and increased malondialdehyde content in the leaves of Chinese cabbage .These effects induced by UV B radiation was enhanced with the time course of treatment.The results above suggested that supplemental UV B radiation enhanced lipid peroxidation of Chinese cabbage,and the accumulation of UV absorbing flavonoid could not alleviate the damage of UV B radiation.