机构地区: 中山大学生命科学学院生物科学与技术系
出 处: 《植物生理学报(0257-4829)》 2000年第6期492-496,共5页
摘 要: 比较了莲子、豇豆、绿豆、玉米、花生、菜心等 6种植物种子的胚或胚轴超氧物歧化酶 (SOD)的活性和热稳定性 ,其中莲子胚轴中SOD活性及耐热性最高。莲子胚轴粗提液中的SOD有Mn SOD和Fe SOD两种类型 ,而Fe SOD耐高温。经 10 0℃处理、硫酸铵沉淀、SephadexG 10 0凝胶过滤和DEAE 纤维素柱层析 ,获得纯化的耐热性强的超氧物歧化酶。纯化酶对KCN不敏感 ,活性受H2 O2 抑制 ,属于Fe SOD。纯化Fe SOD同工酶的分子量为 42 .2和 14. Thermotolerance of lotus seeds in relation to the characteristic of SOD in the seeds. Superoxide dismutase in lotus plumules was tolerant to high temperature(Fig.1 ). There were Mn SOD and Fe SOD in SOD of lotus seeds(Fig.3 ). Only Fe SOD isozymes were tolerant to high temperature. Purified Fe SOD was obtained by boiling and precipitation by 25%~90% of (NH 4) 2SO 4,chromatography by Sephadex G 100 and DEAE cellulose columns( Figs.4~6 and Table 2). The molecular weight of Fe SOD subunits were 42.2 and 14.9 kD.