Ca(NO_3)_2对盐胁迫下黄瓜幼苗生长及膜质过氧化的影响

采用营养液栽培,以黄瓜品种新泰密刺为试材,研究了外源Ca(NO3)2对盐胁迫(NaCl 65 mmol.L-1)下黄瓜幼苗生长、膜质过氧化产物丙二醛(MDA)含量及电解质渗漏率的影响。结果表明:Ca(NO3)2处理可以缓解盐胁迫对黄瓜幼苗生长的抑制,降低盐胁迫引起的MDA含量和电解质渗漏率升高的幅度。其中以2.0mmol.L-1Ca(NO3)2处理效果最好,黄瓜幼苗地上部鲜质量、地上部干质量、株高、茎粗、叶面积、地下部鲜质量、地下部干质量、总根长、总根表面积、总根体积、根尖数等生长指标均显著高于单独盐胁迫处理,同时显著降低了盐胁迫下MDA和电解质渗漏率的上升辐度。

Effects of Exogenous Ca(NO3)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(NO₃)₂ on growth of cucumber seedlings and membrane lipid peroxidation under salt stress(NaCl 65 mmol·L^-1).The results showed that exogenousCa(NO₃)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.