Wang Lihong, Huang Xiaohua, Zhou Qing
School of Environment and Civil Engineering, Jiangnan University, Wuxi, People's Republic of China.
Biol Trace Elem Res. 2009 Apr;128(1):82-93. doi: 10.1007/s12011-008-8250-4. Epub 2008 Oct 25.
The effects of lanthanum (III) (La(III)) in protecting soybean leaves against oxidative stress induced by ultraviolet-B (UV-B) radiation were investigated. The increase in contents of hydrogen peroxide (H(2)O(2)) and superoxide (O2*-) due to UV-B radiation suggested oxidative stress. The increase in the content of malondialdehyde (MDA) and the decrease in the index of unsaturated fatty acid (IUFA) indicated oxidative damage on cell membrane induced by UV-B radiation. La(III) partially reversed UV-B-radiation-induced damage of plant growth. The reduction in the contents of H(2)O(2), O2*-, and MDA and increase in the content of IUFA, compared with UV-B treatment, also indicated that La(III) alleviated the oxidative damage induced by UV-B radiation. The increase in the activities of superoxide dismutase and peroxidase and the contents of ascorbate, carotenoids, and flavonoids were observed in soybean leaves with La(III) + UV-B treatment, compared with UV-B treatment. Our data suggested that La(III) could protect soybean plants from UV-B-radiation-induced oxidative stress by reacting with reactive oxygen species directly or by improving the defense system of plants.
研究了镧（III）（La(III)）对保护大豆叶片免受紫外线-B（UV-B）辐射诱导的氧化应激的影响。由于UV-B辐射导致过氧化氢（H₂O₂）和超氧阴离子（O₂⁻）含量增加，表明存在氧化应激。丙二醛（MDA）含量增加和不饱和脂肪酸指数（IUFA）降低表明UV-B辐射诱导了细胞膜的氧化损伤。La(III)部分逆转了UV-B辐射对植物生长的损伤。与UV-B处理相比，H₂O₂、O₂⁻和MDA含量降低以及IUFA含量增加，也表明La(III)减轻了UV-B辐射诱导的氧化损伤。与UV-B处理相比，在La(III) + UV-B处理的大豆叶片中观察到超氧化物歧化酶和过氧化物酶活性增加以及抗坏血酸、类胡萝卜素和黄酮类化合物含量增加。我们的数据表明，La(III)可以通过直接与活性氧反应或通过改善植物的防御系统来保护大豆植株免受UV-B辐射诱导的氧化应激。
