水分胁迫条件下苹果幼苗叶绿体抗氧化代谢研究Antioxidant Metabolism of the Chloroplast in Apple Seedling Under Water Stress
姚允聪,张大鹏,王有年,高遐虹
摘要(Abstract)：
以苹果属八棱海棠和平邑甜茶组培幼苗为试材，研究了不同浓度ＰＥＧ６０００溶液处理条件下幼苗叶绿Ｏ_２~－和Ｈ_２Ｏ_２代谢变化。结果表明，随着水分胁迫的加重，苹果属植物叶绿体光合放氧活性和ＰＳⅡ电子传递活性先上升而后下降；叶绿体Ｏ_２~－和Ｈ_２Ｏ_２产生速率持续上升；ＳＯＤ、ＣＡＴ、ＡｓＡ－ＰＯＤ、ＧＲ活性在轻度水分胁迫条件下显著上升，在重度水分胁迫条件下显著下降，脂质过氧化产物ＭＤＡ含量则呈相反的趋势；叶绿体ＡｓＡ和ＧＳＨ含量随水分胁迫而下降；叶绿体膜脂质组分随水分胁迫而出现饱和脂肪酸含量上升，不饱和脂肪酸含量下降，不饱和脂肪酸指数下降，类脂中饱和脂肪酸和不饱和脂肪酸的这种变化主要发生在ＭＧＤＧ、ＤＧＤＧ、ＳＬ和ＰＧ中。综合分析阐明了水分胁迫条件下苹果属植物叶绿体Ｏ_２~－和Ｈ_２Ｏ_２产生与清除的生理机理。种间各指标比较表明，水分胁迫条件下八棱海棠幼苗叶绿体比平邑甜茶具有较强的抗氧化能力。
关键词(KeyWords)： 苹果叶绿体;水分胁迫;抗氧化代谢
基金项目(Foundation): 北京市科技新星计划;; 北京市自然科学基金
作者(Author): 姚允聪,张大鹏,王有年,高遐虹
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参考文献(References)：
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