钠钾离子替代对椰苗叶片糖类及其代谢酶活性的影响

对沙培环境中的椰子苗进行钠替代钾试验,结果表明:在Na+和K+总浓度为4mmol·L-1的情况下,25%和50%的钠替代钾处理中,蔗糖含量、可溶性糖含量以及蔗糖合成酶(SS)、蔗糖磷酸合成酶(SPS)的酶活性变化趋势与对照相似,试验后期均趋于平稳且差异不显著(P>0.05);而在75%和100%的钠替代钾处理中,除蔗糖磷酸合成酶(SPS)的酶活性变化趋势与对照基本一致外,蔗糖含量、可溶性糖含量以及蔗糖合成酶(SS)活性均呈逐步下降的趋势。

Effect of the Replacement of Potassium by Sodium on the Sugar Content and the Activity of Related Metabolic Enzymes in the Coconut Leaves

In order to study the change of sucrose content and related metabolic enzymes activity under the condition of the different proportional replacement of potassium by sodium in the coconut leaves,a test was attempted in which the replacement of potassium by sodium in the coconut leaves was carried out under the sand culture. The result showed that： in a condition of which the total concentration of potassium and sodium was 4 mmol·L-1 , the change of the content of sucrose and soluble saccharide,as well as the activity of sucrose synthase and sucrose phosphate synthase,was similar to the control in the treatments of 25% and 50% replacement of potassium by sodium ; not only the tendency was gradually steady and but also the difference between them was not significant in the later period（ P 0. 05） . However,compared to the control ,the contents of sucrose and soluble saccharide and the activity of sucrose synthase reduced gradually in the treatments of 75% and 100% replacement of potassium by sodium,except that the change of the activity of sucrose phosphate synthase was as similar as the control. The results of the study expound that the partial replacement of potassium by sodium had no effect on the contents of sucrose and soluble sugar and the activity of related enzymes in coconut seedlings,which provides stable carbon sources for carbon metabolism,so as to ensure the normal growth of plants.