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为了探讨尖果沙枣的耐盐机理,用NaCl处理尖果沙枣1年生幼苗,处理浓度为50、100、200、300和350 mmol/L,30 d后取样,测定其生理指标。结果表明:随NaCl浓度的增加,叶片膜透性呈增加趋势,叶片水势则有所降低,其中在低于300 mmol/L NaCl浓度下,叶片膜透性和水势的变化幅度不大,在300、350 mmol/L NaCl浓度时与对照呈极显著性差异(P<0.01);随NaCl浓度的增加,脯氨酸含量增加幅度较大,可溶性糖和可溶性蛋白含量均呈较缓的增加趋势,且分别在100 mmol/L和300 mmol/L NaCl浓度下达到最大值,与对照相比,各处理中的有机物质含量均有不同程度增加,其中在350 mmol/L NaCl浓度下的增幅最大;随NaCl浓度的增加,各器官中K+、Ca2+、Mg2+含量变化不大,叶片中K+、Mg2+含量大于茎部和根部,根部Ca2+含量最多,说明植物虽受到一定的伤害,但通过调节渗透调节物质的含量,降低水势,维持其生命代谢,因此,尖果沙枣具有较强的耐盐性。
In order to investigate the mechanism of salt tolerance of B. przewalskii, 1-year-old seedlings of A. przewalskii were treated with NaCl at 50, 100, 200, 300 and 350 mmol / L and 30 days later, and their physiological indexes were measured. The results showed that with the increase of NaCl concentration, membrane permeability of leaves increased and leaf water potential decreased. Under the concentration of 300 mmol / L NaCl, leaf membrane permeability and water potential did not change much. At 300 (P <0.01). With the increase of NaCl concentration, the increase of proline content was larger, and the content of soluble sugar and soluble protein tended to increase more slowly. And reached the maximum at 100 mmol / L and 300 mmol / L NaCl, respectively. Compared with the control, the content of organic matter in each treatment increased to some extent, of which the highest increase was at 350 mmol / L NaCl concentration. With the increase of NaCl concentration, the contents of K +, Ca2 + and Mg2 + in different organs changed little, the contents of K + and Mg2 + in leaves were greater than those in stems and roots, and the contents of Ca2 + in roots were the most, which indicated that though plants harmed to some extent, Of the content, reduce the water potential, to maintain their life metabolism, therefore, sharp fruit jujube has strong salt tolerance.