Effects of Exogenous Ca(NO_3)_2 of Different Concentration on Growth of Cucumber Seedlings under Salt Stress and Plant Membrane Lipid Peroxidation

The cucumber(Cucumis sativus L.)variety‘Xintaimici’was hydroponically cultured to study the effects of different exogenous concentration Ca(NO_3)_2 on growth of cucumber seedlings and membrane lipid peroxidation under salt stress(NaCl 65 mmol·L-1).The results showed that exogenous Ca(NO_3)_2 of different concentration could alleviate the growth inhibition,reduce the increasing range of MDA and electrolyte leakage rate caused by salt stress.2.0 mmol·L-1 Ca(NO3)2 is the best treatment.The above soil fresh quality of cucumber seedling,its dry quality,plant height,stem thickness,leaf areas,under ground fresh weight,dry weight,total root length,total root areas,total root size,number of root tips,etc.other growth index were significantly higher than those under single salt stress treatment.At the same time,the MDA content and the increasing electrolyte leakage rate under salt stress were also decreased.