盐胁迫时铈保护小麦线粒体功能的研究

Protective Effect of Cerium on Mitochondria Wheat underSalinity Stress

研究了小麦种子用Ｃｅ拌种后，在０６％ＮａＣｌ盐胁迫条件下萌发生长及对其根系线粒体功能的影响。Ｃｅ可降低因盐胁迫而升高的Ｏ÷２，·ＯＨ的水平，使脂质氢过氧化物含量和膜流动性趋于正常，提高因盐胁迫而降低的线粒体呼吸和氧化磷酸化活性。说明Ｃｅ具有保护盐胁迫下小麦根系线粒体功能的作用，其机制可能是Ｃｅ３＋，Ｃｅ４＋清除了Ｏ÷２，并降低了·ＯＨ的水平，从而减少了脂质过氧化作用和活性氧对蛋白质的毒害作用。

In order to clarify the effects of cerium on mitochondria of wheat under salinity stress and the mechanism of rare earth enhancing salinity resistane of wheat, the function of mitochondria in roots of wheat seedlings, which were growing in 06% NaCl solution after dressing seeds with cerium was studied. The results show that cerium reduces levels of O2 and OH which have been raised by salinity stress, and makes content of lipid hydroperoxide and fluidity of membrane tend to normal states, and enhances activities of respiration and oxidative phosphorylation. It indicates that cerium protects functions of mitochondria in roots of wheat seedlings. Protective mechanism may be that cerium scavenges O2, therefore, the levels of O2 and OH transformed from O2 are decreased, thus lipid peroxidation and toxic effects of active oxygen on protein are lessened. As a result, functions of mitochondria are on relatively normal levels.