Abstract

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Title:: Effects of Ca(NO3)2 Stress on Growth and Physiological Properties of Cucumber Seedlings

Author(s):: HAN Zhiping1; ZHANG Haixia2; LI Xia1; ZHANG Hongli1; (1.School of Life Science，Shanxi Datong University/Protected Agricultural Technology Development Center,Datong,Shanxi 037009;2.Department of Logistics,Shanxi Datong University,Datong,Shanxi 037009)

Keywords:: Cucumis sativus L.; Ca(NO3)2 stress; growth; lipid peroxidation; osmotic adjustment

Abstract:: The effects of different Ca(NO3)2 concentrations on the growth,lipid peroxidation and the contents of osmotic substances of cucumber seedlings in nutrient solution were studied with greenhouse dedicated cucumber ‘Jinchun No.2’ and ‘Jinchun No.4’,to provide reference for breeding of salt tolerant cucumber and salt tolerant cultivating in greenhouse.The results showed that the plant height,stem diameter,root length,leaf number,leaf length,leaf width,plant fresh mass,plant dry mass and water content of cucumber seedlings were decreased with increasing Ca(NO3)2 concentration.The contents of photosynthetic pigments and soluble protein were increased at lower concentrations Ca(NO3)2,and decreased at higher concentrations Ca(NO3)2.The membrane permeability,the contents of MDA and proline were increased significantly with increasing Ca(NO3)2 concentration.The study illustrated that Ca(NO3)2 stress seriously inhibited the growth of cucumber seedlings mainly through cell water deficit caused by osmotic stress,and cell membrane destruction caused by lipid peroxidation,but there was no apparent difference in the tolerance to Ca(NO3)2 stress between the two cultivars.