Influence of Calcium on Alleviating NaCl-Induced Injury Effects in Wheat Seedlings Effects of Water Stress on Plasma membrane Permeability and Protective Enzyme Activities of Red Pine Seedlings Needles Physiological response of Sonchus brachyotus to salt stress THE EFFECTS OF CALCIUM AND WATER DEFICIENCY ON THE PLASMA MEMBRANE PERMEABILITY OF CUCUMBER LEAVES Influences of Drought Stress on Antioxidative Activity and Osmoregulation Substance of Sonchus brachyotus DC. Physiological Resistance of Three Lolium perenne L.Varieties under PEG stress Cold Resistance Characteristics of 22 Alpine Plant Species in the Eastern-part of Qilian Mountain Effects of cinnamic acid on peroxidization of the plasma membrane of cucumber seedlings