外源ABA对NaCl胁迫下黄瓜幼苗不同离子含量的影响

研究了外源ABA对NaCl胁迫下黄瓜幼苗不同器官中Na+、Cl-、K+和Ca2+含量的影响。结果表明，NaCl胁迫下，黄瓜幼苗体内Na+、Cl-含量升高；叶片中K+、Ca2+含量下降，Na+/K+、Na+/Ca2+增大，SK、Na、SCa、Na降低。外源ABA减少了叶片、根中Na+、Cl-的积累，抑制了叶片K+、Ca2+含量的降低，提高了K+、Ca2+的吸收和运输选择性。外源ABA可通过调控盐胁迫下植株体内的离子平衡，提高黄瓜幼苗的耐盐性。

Effect of Exogenous ABA on Ionic Contents of Cucumber Seedlings under NaCl Stress

The experiment was performed to study the effects of exogenous ABA on Na+Cl-，K+，Ca2+ contents in different organs of cucumber（Cucumis sativus L.）seedlings under NaCl stress.Results showed that Na+ and Cl- contents increased while K+ and Ca2+ contents of leaves decreased，Na+/K+ and Na+/Ca2+ increased，SK、Na and SCa、Na decreased in NaCl-treated cucumber seedlings.Cucumber seedlings treated with exogenous ABA combined with salinity showed higher levels of K+ and Ca2+ accumulation of leaves and lower levels of Na+ and Cl- accumulation of leaves and root.Exogenous ABA could improve the absorbing selectivity of K+ and Ca2+，thus to enhance the salt tolerance of cucumber seedlings.