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草业学报  2015 

水分胁迫下白沙蒿幼苗抗性与其膜脂构成关系研究

DOI: 10.11686/cyxb20150207, PP. 55-61

Keywords: 白沙蒿,PEG-6000,水分胁迫,生理特性,脂肪酸

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Abstract:

以0,5%,15%,25%聚乙二醇(PEG-6000)对白沙蒿进行水分胁迫处理,研究其对胁迫的生理响应。结果表明,随着胁迫程度的加强,白沙蒿叶片相对含水量明显降低,叶片膜脂脂肪酸各组分含量发生明显变化,水分胁迫白沙蒿幼苗导致叶片膜脂脂肪酸的合成趋向饱和化。5%,15%PEG胁迫下膜脂趋向饱和化有利于减少不饱和脂肪酸的过氧化作用,减弱因膜脂过氧化所引起的对细胞膜系统的伤害;25%PEG处理下的膜脂过饱和化导致膜功能损伤。棕榈油酸、亚油酸在白沙蒿抵御水分胁迫过程中发挥维持一定膜脂不饱和度的重要作用。白沙蒿体内重要的渗透调节物质脯氨酸和可溶性糖含量在水分胁迫过程中虽然明显增加,但不能阻止膜脂过氧化作用对细胞的伤害。

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