Ca^(2+)信号系统对低温下柑橘膜脂过氧化和抗氧化酶的影响  

Effects of calcium signal system on anti-oxidant enzymes and membrane lipid peroxidation of citrus under low temperature

作　　者：李新国[1] 张建霞[1] 孙中海[1] 

机构地区：[1]华中农业大学国家柑橘育种中心教育部园艺植物生物学重点实验室,武汉430070

出　　处：《广西植物》2007年第4期643-648,共6页Guihaia

基　　金：国家自然科学基金(30070528;30571289)~~

摘　　要：研究不同Ca2+处理对低温下柑橘愈伤组织膜脂过氧化和抗氧化酶的变化。结果表明,一定低浓度的Ca2+(5mmol/L)能明显减少柑橘愈伤组织膜伤害率和膜脂过氧化产物MDA的积累,增加渗透调节物质可溶性蛋白质的含量,提高膜保护性酶SOD和POD的活性,从而增强柑橘的抗寒性。采用Ca2+螯合剂乙二醇双乙胺醚-N,N′-四乙酸(ethylene glycol-bis-β-aminoethylether-N,N′-tetraacetic acid,EGTA)或钙调素(cal mod-ulin,Ca M)拮抗剂三氟拉嗪(trifluoperazine,TFP)处理会增加膜伤害率和MDA的积累,减少可溶性蛋白质的合成,降低SOD和POD的活性。说明钙信号系统参与调节柑橘抗寒中膜脂过氧化和保护性酶等生理生化反应。Effects of calcium signal system on anti-oxidant enzymes and membrane lipid peroxidaton of citrus callus under low temperature were studied. The results showed that exogenous Ca^2＋ （5 mmol/L） could markedly decrease membrane injury rate and malondialdehyde（MDA） accumulation during low temperature stress. Moreover, it could raise the content of soluble protein and increase the activity of superoxide dismutase （SOD）and peroxidase （POD）. Exogenous calcium could strengthen the cold-resistant of citrus,compared with Ca-deficient treatment. But such effects were inhibited by addition of Ca^2＋ chelating agent EGTA or calmodu- lin antagonist TFP in the culture medium. Taken together the results above,it is suggested that calcium signal system may be involved in the membrane lipid peroxidation and protective enzyme system of cold-resistant of citrus under low temperature.

关 键 词：CA^2+ EGTA TFP 柑橘愈伤组织 抗氧化酶 膜脂过氧化 

分 类 号：S603.4[农业科学—园艺学] Q945[生物学—植物学]