Effects of EGTA, verapamil and trifluoperazine on ABA, and xylem sap pH of maize seedling under drought stress THE STUDY OF SEASONAL RAIN FOREST CLASSIFICATION IN ACID SOIL REGION OF GUANGXI Effects of calcium signal system on anti-oxidant enzymes and membrane lipid peroxidation of citrus under low temperature Regulation of EGTA on Cd and Nutrient Elements Accumulation in Ricinus communis under Cd Stress Regulation of EGTA and Tartaric Acid on Cd Stress and Accumulation in Ricinus communis L.