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草业学报  2014 

外源亚精胺调控草地早熟禾幼苗耐盐性的研究

DOI: 10.11686/cyxb20140625, PP. 207-216

Keywords: 多胺,亚精胺,盐胁迫,草地早熟禾,耐盐性

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Abstract:

盐胁迫严重危害草坪草的正常生长并且限制其大面积建植,尤其是对耐盐性相对较差的草地早熟禾。本试验以耐盐性不同的2个草地早熟禾品种‘兰肯(Kenblue)’和‘午夜(Midnight)’作为试验材料,采用MS培养基作为培养基质,以200mmol/L的NaCl为胁迫条件,施用浓度为1mmol/L的外源亚精胺(Spd),研究了盐胁迫下外源亚精胺对草地早熟禾幼苗生长及其相关生理指标的影响。结果表明,外源Spd处理能够缓解盐胁迫对草地早熟禾根系和幼苗生长的抑制,提高APX、CAT、POD和SOD的活性以及脯氨酸的含量,减少体内活性氧H2O2和O2-·的积聚,降低MDA的含量和细胞膜透性,同时,外源Spd处理还可以加强离子营养平衡能力,降低细胞内Na+的含量,增加K+、Ca2+和Mg2+的含量,进而促进细胞内离子的区域化分布,稳定细胞膜结构。因此,从实验结果可以推断外源Spd处理可以提高草地早熟禾幼苗的耐盐性,这为降低盐胁迫对草坪草的伤害以及扩大建植草坪草提供了有利的理论基础。

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