Effects of Lanthanum on Redox Systems in Plasma Membranes of Casuarina equisetifolia Seedlings Under Acid Rain Stress
来源期刊：JOURNAL OF RARE EARTHS2003年第5期
论文作者：李裕红 严重玲 梁洁 张瑞锋 刘景春
Key words：ecology; PM redox system; lanthanum; Casuarina equisetifolia; acid rain stress; rare earths;
Abstract: The effects of lanthanum on some redox system(PMRS) properties of the plasma membrane(PM) vesicles from Casuarina equisetifolia seedlings under artificial acid rain(pH 4.5)stress were studied. The results show that there are NADH oxidase and EDTA-Fe3+ reductase, and nitrate reductase in the seedling PM, and they have different responses to soaking seeds for 8 h in a series of LaCl3 solution. The NADH oxidase activities and the Nitrate reductase activities can be stimulated when La3+ concentrations is in the range of 50～200 mg*L-1, but their activities are inhibited or fluctuate by the higher La3+ concentrations. The EDTA-Fe3+ reductase activities can be stimulated by La3+ concentrations in the range of 50～400 mg*L-1. The research also revealed that La3+ reduces the relative permeability of membranes and have the function in protecting membranes under acid rain stress by the way of inhibiting the leakage of electrolyte.
李裕红1，严重玲1，梁洁1，张瑞锋1，刘景春1
(1.School of Life Sciences, Xiamen University, Xiamen 361005, China;
2.Department of Biology, Quanzhou Normal College, Quanzhou 362000, China)
Abstract:The effects of lanthanum on some redox system(PMRS) properties of the plasma membrane(PM) vesicles from Casuarina equisetifolia seedlings under artificial acid rain(pH 4.5)stress were studied. The results show that there are NADH oxidase and EDTA-Fe3+ reductase, and nitrate reductase in the seedling PM, and they have different responses to soaking seeds for 8 h in a series of LaCl3 solution. The NADH oxidase activities and the Nitrate reductase activities can be stimulated when La3+ concentrations is in the range of 50～200 mg*L-1, but their activities are inhibited or fluctuate by the higher La3+ concentrations. The EDTA-Fe3+ reductase activities can be stimulated by La3+ concentrations in the range of 50～400 mg*L-1. The research also revealed that La3+ reduces the relative permeability of membranes and have the function in protecting membranes under acid rain stress by the way of inhibiting the leakage of electrolyte.
Key words:ecology; PM redox system; lanthanum; Casuarina equisetifolia; acid rain stress; rare earths;
【全文内容正在添加中】
