OALib Journal期刊
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硝酸型和硫酸型酸胁迫下油橄榄离体叶片的抗性生理比较
DOI: 10.3724/SP.J.1145.2014.04035, PP. 999-1004
Keywords: 油橄榄,酸胁迫,硝酸型,硫酸型,抗性生理
Abstract:
基于我国酸雨类型正逐渐从硫酸型趋向硝酸型转化,分别以含有较多硫酸根的硫酸、硝酸混合液(sulphur-richacid,sra)和较多硝酸根的硫酸、硝酸混合液(nitric-richacid,nra)浸泡离体油橄榄叶片,模拟硫酸型、硝酸型两种类型的酸胁迫,探讨不同酸度不同胁迫时间油橄榄离体叶片抗性生理的差异及其变化机理.结果表明,随着胁迫时间延长,叶片丙二醛(mda)含量显著增加(p<0.05),叶绿素和类胡萝卜素含量降低,可溶性糖含量先增后减,脯氨酸含量和细胞膜稳定指数(msi)下降;对比这两种类型的酸胁迫,ph为3的酸胁迫48h时nra酸胁迫叶绿素含量较sra酸胁迫低10.12%(以硝酸型相关数据为基数,下同),类胡萝卜素含量、msi下降幅度及mda含量升高幅度均大于sra型酸胁迫,说明nra型酸胁迫造成了较为严重的色素分解、脂质过氧化和细胞膜损伤.酸胁迫还引起超氧阴离子产生速率和过氧化氢含量增加,且硝酸型酸胁迫活性氧水平升高较大;抗氧化酶活性先变大后变小,维生素c含量和还原型谷胱甘肽含量均减小,且nra酸胁迫减小幅度大于sra,说明nra酸胁迫比sra酸胁迫对油橄榄叶片具有较强的氧化性,对抗氧化酶、类胡萝卜素、还原型谷胱甘肽等构成的细胞膜保护系统损害更大,从而加重了细胞膜的损伤,如ph为3的酸胁迫48h时,nra酸胁迫msi较sra酸胁迫低26.52%.可见,在较强的酸溶液(ph3.0)胁迫较长时间时,硝酸型酸胁迫相对于硫酸型酸胁迫对细胞内的抗氧化系统具有较强的破坏,并由此造成了较为严重的细胞膜损伤.
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