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草业学报  2015 

外源甜菜碱对低温胁迫下结缕草生理特性的影响

DOI: 10.11686/cyxb2014431, PP. 181-188

Keywords: 结缕草,低温胁迫,甜菜碱,生理特性

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Abstract:

甜菜碱作为一种重要的渗透调节物质,与低温胁迫下植物的抗逆性有着密切的联系。为了探讨不同浓度外源甜菜碱对低温胁迫下结缕草相关生理指标的影响,本实验以结缕草‘青岛’品种为实验材料,分别采用0,50,100和150mmol/L的甜菜碱进行叶面喷施,在8/2℃(白天/夜间)的培养箱中连续处理28d,以正常管理(28/24℃)作为对照。结果表明:外源甜菜碱能够有效缓解低温胁迫下结缕草坪观质量和叶绿素含量的下降,减少电解质渗透率和丙二醛含量的升高,显著提高SOD、POD、CAT和APX的活性,从而降低H2O2和O2·-的累积,同时,外源甜菜碱还可以提高低温胁迫下结缕草可溶性蛋白和脯氨酸的含量,增强渗透调节能力,进而增强结缕草对低温胁迫的抵抗性。其中,外施100mmol/L甜菜碱对提高结缕草的耐低温能力的效果最为显著。

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