Abstract: Two years old potted plant Nongda 3 and Nongda 4 Cerasus humilises, obtaived by tissue culture, were irrigated with different concentrations of NaHCO₃ solutions and the physiological indexes of leaves were mensurated. The results indicated that the chlorophylla content in two clone of C. humilis of leaves both changed mildly firstly then decreased, analysis of variance were significantly different among different treatments; the change of chlorophyll a/b were steady in the whole stress period; the proline content chanqed mildly firstly then increased; the changes of electrolyte exosmosis percentage, MDA content and POD activity of Nongda 3 were not clear firstly then increased and then decreased, and analysis of variance showed there were no significant difference among different treatments, the change of SOD activity at the middle and low concentrations were not clear, the chang at high concentration was clear, and analysis of variance showed there were significant differences among different treatments, the change of Nongda 4 electrolyte exosmosis percentage, SOD activity, POD activity and MDA content firstly increased then decreased, after salt stress relieved, exosmosis percentage, SOD activity, POD activity at high concentration increased, while decreased at low concentration, MDA was opposite. In the long period of NaHCO₃ salt stress, Nongda 3 and Nongda 4 C. humilises both showed highly tolerant against salt-stress.

Key words: Cerasus humilis, salt stress, physiological index