Effects of Exogenous Spermidine on the Salt Resistance of Saltbush under Salt Stress
DOU Jun-xia et al (Taishan Polytechnic College,Taian,Shandong 271000)
[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.When the concn.of NaCl was lower than 200 mmol/L,the contents of chlorophyll in saltbush leaves had no significant increment in CK and treatments with Spd and Spd+DCHA and when the concn.of NaCl was 400 mmol/L,their chlorophyll contents were increased significantly.Under the stress of NaCl at high concn.,the content of MDA changed little in the treatment with Spd and was increased in the treatment with DCHA.Under the stress of NaCl,the relative conductivity was increased significantly in the treatment with DCHA and that was least in the treatment with Spd.[Conclusion] Fertilization of exogenous spermidine could reverse the salt stress effect of NaCl on saltbush and the effect of fertilizing exogenous DCHA was opposite.
【CateGory Index】： S184