钙调素拮抗剂W7对低氧胁迫下黄瓜根系抗氧化系统的影响  

Effect of calmodulin antagonist W7 on antioxidant systems of roots of cucumber seedlings under hypoxia stress

作　　者：焦彦生[1] 郭世荣[1] 李娟[1] 樊怀福[1] 马蓉丽[2] 黄保健[1] 

机构地区：[1]南京农业大学园艺学院,南京210095 [2]山西省农业科学院蔬菜研究所,太原030031

出　　处：《中国生态农业学报》2008年第5期1178-1182,共5页Chinese Journal of Eco-Agriculture

基　　金：国家自然科学基金项目(30571263);山西省回国留学人员科研项目(2006-87);山西省自然科学基金项目(2008011068)资助

摘　　要：以黄瓜为材料采用营养液栽培法研究了低氧胁迫下钙调素拮抗剂W7对根系抗氧化系统的影响。结果表明:用50 mmol.L-1W7预处理24 h后,进行低氧胁迫处理,黄瓜根系的超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)、谷胱甘肽还原酶(GR)的活性降低,而O2产生速率、H2O2和丙二醛(MDA)含量均高于低氧胁迫处理。钙调素拮抗剂W7预处理后,导致黄瓜根系内活性氧含量升高和保护酶活性下降,从而降低黄瓜对低氧胁迫的抵抗能力,减缓了根系生长,表明Ca2+.CaM信号系统的诱导和调控对缓解低氧胁迫具有重要作用。The effect of calmodulin antagonist W7 on antioxidant systems of roots of cucumber seedlings under hypoxia stress was studied in hydroponics culture.Results show that pretreated seedlings with calmodulin antagonist W7 under hypoxia stress have lower SOD,POD,CAT,APX and GR activities,and higher production rate of O2,MDA and H2O2contents compared with hypoxia stress treatment without calmodulin antagonist W7 pretreatment.This indicates that calmodulin antagonist W7 pretreatment can restrain Ca^2＋·CaM signal transduction,leading to increase in reactive oxygen content and decrease in activity of certain antioxidants,subsequently reducing resistance of cucumber seedlings to hypoxia stress,hence stunted roots.The experiment shows that Ca^2＋·CaM signal system plays an important regulating role in alleviating hypoxia stress in roots of cucumber seedlings.

关 键 词：钙调素拮抗剂W7 低氧胁迫 黄瓜根系 抗氧化系统 水培 

分 类 号：Q945.7[生物学—植物学] S642.2[农业科学—蔬菜学]