Responses of Growth and Physiology of Calcicoles and Calcifuges to Exogenous Ca2+ The Physiological and Biochemical Responses of Jat ropha curcas L. Under Sr2+ Stress With Exogenous Ca2+ Effects of exogenous Ca2+ on the seed germination of Koelreuteria paniculata in limestone area of Southwest China under drought stress. Ameliorative effect of exogenous Ca2+and GA3 on Peganum harmala alkaloid inhibition in germinating cucumber seeds Responses of primary root and antioxidase system to exogenous Ca2+ in pea under H2O2 stress