Du Y, Jin Y
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110015.
Ying Yong Sheng Tai Xue Bao. 2000 Oct;11(5):660-4.
The effect of far-ultraviolet radiation on lipid peroxidation and inherent protection system in seedlings of Taxus cuspidata was examined with simulated UV-BC irradiation treatments. The electrolyte leakage, lipid peroxidation, tissue autoxidation and H2O2 content increased, while the contents of soluble protein, ascorbic acid, carotenoids, and chlorophyll and the photosynthetic electron transport rate of Photosystem II decreased with the increasing time of treatment. The lipid peroxidation of the needles was inhibited by exogenous scavengers sodium benzoate and ascorbate, but enhanced to some extent by methyl viologen and DDC (an inhibitor of SOD). The mechanisms of the injury of the seedlings induced by UV-BC radiation might be similar to that of photooxidation injuries of conifers in winter. However, Taxus cuspidata was much more resistant to UV-BC radiation than crops.
通过模拟UV-BC辐射处理,研究了远紫外辐射对东北红豆杉幼苗脂质过氧化及内在保护系统的影响。随着处理时间的延长,电解质渗漏、脂质过氧化、组织自氧化和H2O2含量增加,而可溶性蛋白、抗坏血酸、类胡萝卜素、叶绿素含量以及光系统II的光合电子传递速率降低。针叶的脂质过氧化受到外源清除剂苯甲酸钠和抗坏血酸盐的抑制,但被甲基紫精和DDC(超氧化物歧化酶抑制剂)在一定程度上增强。UV-BC辐射诱导幼苗损伤的机制可能与针叶树冬季光氧化损伤的机制相似。然而,东北红豆杉对UV-BC辐射的抗性比农作物强得多。