Study on Sa lt-tolerance Ability in Rooted Cuttings of D ifferent Ca suar ina Clones Effect of NaCl Stress on the Antioxidative System and Osmotic Regulation Substance of Six Varieties of Safflower Seedlings Early physiological response to manganese ion with different concentrations and manganese tolerance of Camellia oleifera seedlings Physiological response and salttolerance of Gleditsia microphylla under NaCl stress.