Effects of NaCl Treatments on Growth and Eco-physiological Characteristics of Tamarix ramosissima
A pot experiment was conducted to study the influence of different concentrations (0、50、100、200、400 mmol·L-1) NaCl on the growth,leaf hydrogen peroxide (H2O2),malonaldehyde (MDA) content,superoxide dismutases (SOD),catalases (CAT),peroxidase (POD),ascorbate peroxidase (APX) enzymes activity,water potential,soluble sugar and proline contents of Tamarix ramosissima young plant.The results showed that shoot height,crown area,number of branches,dry mass of leaf and branch of T.ramosissima were promoted at lower NaCl concentrations (≤ 100 mmol· L-1),however,the growth of T.ramosissima were inhibited at higher NaCl concentration (≥200 mmol· L-1),and the suppression effect to lateral root dry mass was larger to crown area,number of branches,dry mass of leaf and branch,and was larger to shoot height.H2O2 and MDA contents were not accumulated at lower NaCl concentrations,but accumulated at higher NaCl concentrations (≥200 mmol· L-1) compared with control level.SOD,POD,CAT and APX activities enhanced at lower NaCl concentrations (≤l00 mmol· L-1) compared with control level,whereas SOD and POD activities began to descend at higher NaCl treatments.Water potential in leaves of T.ramosissima reduced significantly with the increasing in NaCl concentrations.Proline and soluble sugar contents increased at lower NaCl concentrations compared with control level.
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