Regulation of 63.5 kD Heat-stable Protein in Maize Seedling Roots by ABA and Calcium/Calmodulin under Osmotic Stress EFFECTS OF PLC/PLD INHIBITOR ON EXPRESSION AND REGULATION OF A NOVEL 69.5 kD HEAT-STABLE PROTEIN IN MAIZE SEEDLING ROOTS UNDER SALT STRESS Physiological effect of signal substances in tomato plants induced by arbuscular mycorrhizal fungi