2个欧李品种对碳酸盐胁迫生理响应的初步研究

在盆栽条件下，以不同浓度的NaHCO₃溶液浇灌农大欧李3和4号2年生组培苗，测定苗木叶片的生理指标。结果表明：随胁迫时间的延长，两个品种的叶绿素a呈先变化平缓后降低趋势，各处理间差异显著；叶绿素a/b在整个处理时期变化平稳；脯氨酸呈先变化平缓后升高趋势；农大欧李3号的电解质外渗率、MDA和POD活性呈先变化平缓后升高再降低的趋势，各处理间差异不显著；中、低浓度SOD活性整个胁迫期变化平缓，高浓度的在整个胁迫期间变化较大，各处理间差异极其显著；农大欧李4号电解质外渗率、SOD、POD和MDA在处理期间呈先升高后降低趋势，胁迫解除后，高浓度处理的电解质外渗率、SOD、POD活性上升、低浓度处理下降，MDA则相反。在长期的NaHCO₃胁迫过程中，农大欧李3号和4号都显示了强的耐盐性。

Primary Studies on Physiological Response of Two Varieties of Cerasus humilis to NaHCO_3 Stress

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.