Nitrogen Under- and Over-supply Induces Distinct Protein Responses in Maize Xylem Sap Effects of 30% Diethyl-Amino-Ethyle-Hexanoate·Ethephon Soluble Concentrate on Roots Bleeding Sap and Its Com-ponents of Zea mays Influence of Organic and Inorganic Nitrogen Supply on the Composition of Tomato Seedling Root Exudates, Xylem and Phloem Sap Grown in Hydroponic Culture Effects of EGTA, verapamil and trifluoperazine on ABA, and xylem sap pH of maize seedling under drought stress Effects of Silicon on water use efficiency in sunflower with solution culture