Medical College of Soochow University, 215123 Suzhou, People's Republic of China.
Biol Trace Elem Res. 2011 Sep;142(3):819-30. doi: 10.1007/s12011-010-8814-y. Epub 2010 Aug 25.
The influence of LaCl(3), CeCl(3), and NdCl(3) on the antioxidative defense system in maize seedlings under cold stress was investigated. It was found that maize seedlings cultivated in cold stress developed distinct cold symptoms, and the plant growth was significantly inhibited as expected, while Ln-treated seedling growth was improved. Cold stress in maize seedlings also increased the permeability of plasma membrane, malondialdehyde as a degradation product of lipid peroxidation, and reactive oxygen species such as superoxide radicals and hydrogen peroxide, and decreased activities of the antioxidant enzymes such as superoxide dismutase, catalase, ascorbate peroxidase, and glutathione content; however, Ln treatments cultivated in cold stress decreased the permeability of plasma membrane, malondialdehyde, and reactive oxygen species, and increased activities of the antioxidative defense system. It implied that Ln could increase oxidative-stress resistance under cold stress. On the other hand, the assay of physiological and biochemical parameters demonstrated that Ce relieving chilling injury of maize seedlings caused by cold stress was most significant, medium in the Nd treatment, and last in the La treatment. These results suggested that the increase of cold resistance of maize seedlings caused by Ln might be closely related to its properties of 4f electron shell and variable valence.
研究了 LaCl(3)、CeCl(3) 和 NdCl(3) 对冷胁迫下玉米幼苗抗氧化防御系统的影响。结果发现，在冷胁迫下培养的玉米幼苗出现明显的冷胁迫症状，植物生长受到明显抑制，而 Ln 处理的幼苗生长得到改善。冷胁迫还增加了玉米幼苗质膜的通透性、丙二醛（脂质过氧化的降解产物）和超氧自由基、过氧化氢等活性氧物质的含量，降低了超氧化物歧化酶、过氧化氢酶、抗坏血酸过氧化物酶和谷胱甘肽含量等抗氧化酶的活性；然而，Ln 在冷胁迫下处理降低了质膜的通透性、丙二醛和活性氧物质的含量，增加了抗氧化防御系统的活性。这表明 Ln 可以在冷胁迫下提高氧化应激抗性。另一方面，生理生化参数的测定表明，Ce 对冷胁迫下玉米幼苗的冷害缓解作用最为显著，Nd 次之，La 作用最小。这些结果表明，Ln 提高玉米幼苗抗寒性可能与其 4f 电子壳层和可变价态的性质密切相关。
