外源亚精胺对盐胁迫下滨藜抗盐性的影响

目的]为滨海盐渍土的生物改良和利用提供理论依据。方法]以盐生植物滨藜为材料,研究外源亚精胺及其生物合成抑制剂二环己基胺（DCHA）对盐胁迫下滨藜抗盐性的影响。结果]直到NaC l浓度增加到400 mmol/L时,各处理的叶片相对含水量才明显降低,尤其是DCHA处理。NaC l浓度低于200 mmol/L时,对照和Spd、Spd＋DCHA处理的滨藜叶片中的叶绿素含量增加不显著,NaC l浓度为400 mmol/L时,它们的叶绿素含量增加显著。在高浓度NaC l胁迫下,Spd处理的MDA含量变化不明显,DCHA处理的MDA含量升高。在NaC l胁迫下,DCHA处理的相对电导率显著增大,而Spd处理的电导率最小。结论]外施亚精胺可逆转NaC l对滨藜的盐胁迫效应,外施DCHA的作用则相反。

Effects of Exogenous Spermidine on the Salt Resistance of Saltbush under Salt Stress

Objective] The aim was to provide theoretical basis for the biological improvement and utilization of coastal saline soil.Method] With halophyte saltbush as material,the effects of exogenous spermidine and its biosynthetic inhibitor dicyclohexyl amine(DCHA) on the salt resistance of saltbush under salt stress were researched.Result] The relative water content in leaf in the treatments did not show obvious decrement,till the concn.of NaCl was increased to 400 mmol/L,especially for the treatment with DCHA....