外源亚精胺对盐胁迫下黄瓜幼苗体内抗氧化酶活性的影响

生态学杂志

外源亚精胺对盐胁迫下黄瓜幼苗体内抗氧化酶活性的影响

张润花;郭世荣;樊怀福;李娟

南京农业大学园艺学院，南京 210095

收稿日期:2006-03-31 修回日期:2006-03-31 出版日期:2006-11-10 发布日期:2006-11-10

Effects of exogenous spermidine on anti-oxidative enzyme activities in cucumber seedlings under salt stress

ZHANG Runhua;GUO Shirong;FAN Huaifu; LI Juan

College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China

Received:2006-03-31 Revised:2006-03-31 Online:2006-11-10 Published:2006-11-10

摘要/Abstract

摘要： 以不同耐盐性黄瓜品种“长春密刺”和“津春2号”为材料，采用营养液栽培，研究了外源亚精胺（Spd）对NaCl胁迫下黄瓜幼苗叶片与根系中超氧阴离子（O₂^-.）产生速率、超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）活性的影响。结果表明，外源Spd对未经盐胁迫处理（对照）黄瓜幼苗体内O₂^-.产生速率、SOD、CAT和POD活性均无显著性影响；盐胁迫处理提高了O₂^-.产生速率，SOD、POD和CAT活性都有不同程度的升高；外源Spd处理进一步提高了盐胁迫下SOD、POD和CAT活性，减缓了O₂^-.产生速率。与耐盐型“长春密刺”品种相比，盐胁迫对盐敏感型“津春2号”影响较大，外源Spd对盐敏感型黄瓜品种盐胁迫伤害的缓解作用较大。表明盐胁迫下外源Spd可缓解盐胁迫对膜的伤害，从而提高黄瓜幼苗的耐盐性。

关键词: 东海赤潮, 围隔, 种间竞争

Abstract: In a hydroponic experiment with the seedlings of cucumber varieties “Changchun Mici" (salt-tolerant) and “Jingchun No. 2" (salt-sensitive), this paper studied the effects of exogenous spermidine (Spd) on the O₂^-. producing rate and protective enzyme activities in roots and leaves under NaCl stress. The results showed that exogenous Spd had no significant effects on the O₂^-. producing rate and the activities of superoxide dismutase (SOD),peroxidase (POD) and catalase (CAT) in the control, but further increased the activities of SOD, POD and CAT while decreased the O₂^-. producing rate under salt stress, indicating that exogenous Spd could alleviate the salt stress damage on cucumber seedlings. Comparing with “Jingchun No. 2", the cucumber variety “Changchun Mici" was less affected by saltstress, and the alleviation effect of exogenous Spd on salt stress damage was less in “Changchun Mici" than that “in Jinchun No. 2".

Key words: East China Sea, Mesocosm, Interspecific competition

张润花;郭世荣;樊怀福;李娟. 外源亚精胺对盐胁迫下黄瓜幼苗体内抗氧化酶活性的影响[J]. 生态学杂志.

ZHANG Runhua;GUO Shirong;FAN Huaifu; LI Juan. Effects of exogenous spermidine on anti-oxidative enzyme activities in cucumber seedlings under salt stress[J]. cje.

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