热激对冷胁迫下玉米幼苗质膜透性和抗氧化酶活性的影响  

Effect of heat shock on permeability of plasma membrane and activities of antioxidative enzymes in maize seedlings under chilling stress

作　　者：郭丽红[1] 王德斌[1] 王定康[1] 陈善娜[2] 

机构地区：[1]昆明师范高等专科学校生物系,云南昆明650031 [2]云南大学生命科学学院,云南昆明650092

出　　处：《西南农业学报》2008年第1期48-51,共4页Southwest China Journal of Agricultural Sciences

基　　金：云南省教育厅自然科学基金(04Y670B);昆明师范高等专科学校重点学科建设基金(Z-002);云南大学“211工程”二期建设费及植物学博士点经费

摘　　要：以玉米幼苗为材料,研究热激对玉米幼苗在冷胁迫过程中的存活率、质膜透性、抗氧化酶活性的影响。结果表明,热激处理提高了玉米幼苗在冷胁迫中的存活率,表明热激能提高玉米幼苗的抗冷性。同时热激也提高了冷胁迫过程中的抗氧化酶如超氧化物歧化酶(SOD)、谷胱甘肽还原酶(GR)、过氧化氢酶(CAT)、抗坏血酸专一性过氧化物酶(APX)、愈创木酚过氧化物酶(GPX)的活性,而降低冷胁迫过程中的质膜透性。表明热激通过抗氧化酶的抗氧化作用保护细胞免受破坏或破坏程度受到削弱,从而提高植物抗冷性。Effect of heat shock on permeability of plasma membrane and activities of antioxidative enzymes in maize seedlings under chilling stress was studied. The results showed that heat-shock pretreatments sigaificantly increased survival percentage of maize scedlings under severe chilling stress,indicating that heat-shock could induce chilling resistance in maize seedlings. At the same time, it had been found that heat shock increased SOD,GB, CAT,APX and GPX activities and decreased cytomembrane permeability during chilling stress,indicating that heat shock enhanced chilling tolerance of maize seedlings by increasing SOD, GB, CAT, APX and GPX activities to protect cell membrane from destruction and that antioxidative enzymes could play an important role in the formation d heat-shock-induced chilling tolerance .

关 键 词：玉米幼苗 热激 冷胁迫 质膜透性 抗氧化酶 

分 类 号：S513[农业科学—作物学]