盐胁迫下外源水杨酸对菊花根系离子含量和ATPase及PPase活性的影响

 采用水杨酸（SA）叶面喷施法，研究了NaCl胁迫下外源SA对菊花根系Na+、K+、Ca2+ 、Mg2+含量以及根系质膜ATPase、液泡膜ATPase和PPase活性的影响。结果表明，盐胁迫增加了菊花根系中Na+的含量而减少了K+、Ca2+、Mg2+的含量，而外源SA处理减少了Na+的含量并增加了K+、Ca2+、Mg2+的含量。NaCl胁迫下菊花根系质膜ATPase、液泡膜ATPase和PPase活性均明显下降，外源SA处理减小了盐胁迫引起的质膜ATPase、液泡膜ATPase和PPase活性的下降幅度，而且在胁迫10 d时，外源SA处理的根系质膜ATPase、液泡膜ATPase和PPase活性分别比NaCl处理提高了17.67%、16.47%和18.65%。说明盐胁迫下外源SA可以通过诱导质子泵活性来提高菊花根系对K+、Ca2+ 、Mg2+的吸收和减少对Na+的吸收，从而缓解盐胁迫对菊花植株的伤害程度。

Effects of Exogenous Salicylic Acid on Ion Content,Activities of ATPase and PPase of the Roots in Chrysanthemum Under Salt Stress

The effects of salicylic acid(SA)on the content of Na+,K+,Ca2+ and Mg2+ and activities of plasma membrane H+-ATPase,tonoplast H+-ATPase and H+-PPase of roots of chrysanthemum under salt stress were studied with the methods of spraying exogenous SA on leaves of chrysanthemum.The results showed that salt stress increased the contents of Na+,but reduced the contents of K+,Ca2+,Mg2+ of the roots of chrysanthemum.Exogenous SA treatment decreased Na+ contents,increased K+,Ca2+ and Mg2+ contents in the roots of ch...