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在实验室水培条件下,研究了NaCl胁迫下玉米幼苗不同器官中Na+、K+、Ca2+、Mg2+和Cl-含量的变化。结果表明:玉米各个部分Na+和Cl-含量、Na+/K+和Na+/Ca2+比值均随着培养液中NaCl浓度的增加而迅速提高,Na+、K+和Cl-含量的变化幅度为根系>成熟叶叶鞘>生长叶>成熟叶叶片,玉米幼苗根系最易受外界离子浓度的影响,叶片受外界环境影响较小;各器官中Ca2+、Mg2+对盐胁迫的响应不一致,NaCl胁迫使根系中Ca2+、Mg2+含量下降,成熟叶叶鞘中Mg2+含量变化规律性不明显,而NaCl胁迫下,成熟叶叶片中Ca2+、Mg2+含量增加;玉米幼苗具有拒Na+机制,具有一定的耐盐性,它的耐盐性是通过根和成熟叶叶鞘来实现的,Na+主要贮存在根系和成熟叶叶鞘中,而向成熟叶叶片和生长叶中运输较少;成熟叶叶鞘同时还具有拒Cl-能力。
Under laboratory hydroponic conditions, the changes of Na +, K +, Ca2 +, Mg2 + and Cl- contents in different organs of maize seedlings under NaCl stress were studied. The results showed that the contents of Na + and Cl-, the ratio of Na + / K + and Na + / Ca2 + in various parts of maize increased rapidly with the increase of NaCl concentration in the culture medium. The changes of Na +, K + and Cl- contents were root> > Growing leaves> mature leaves and corn seedling were the most susceptible to external ion concentration, and the leaves were less affected by external environment. The responses of Ca2 + and Mg2 + to salt stress were not consistent in all organs. NaCl stress caused the contents of Ca2 + and Mg2 + The content of Ca2 + and Mg2 + in leaves of mature leaves increased under NaCl stress. The maize seedlings had the mechanism of rejecting Na + and had some salt tolerance. The salt tolerance of maize seedlings was enhanced by Roots and mature leaf sheaths. Na + was mainly stored in root sheaths and mature leaf sheaths, but less in mature leaf and growing leaf. In addition, mature leaf sheaths also had the ability to resist Cl-.