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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10d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。
The effects of exogenous SA on the contents of Na +, K +, Ca2 +, Mg2 + and the activities of plasma membrane ATPase and tonoplast ATPase and PPase in roots of chrysanthemum were studied by SA foliar spray. The results showed that salt stress increased the content of Na + in roots and decreased the content of K +, Ca2 + and Mg2 +. However, the exogenous SA reduced the content of Na + and increased the contents of K +, Ca2 + and Mg2 +. Under NaCl stress, the activities of plasma membrane ATPase, tonoplast ATPase and PPase in the roots of chrysanthemum were significantly decreased. Exogenous SA treatment reduced the decrease of plasma membrane ATPase, vacuolar ATPase and PPase activities induced by salt stress, and at 10 days of stress, The activities of plasma membrane ATPase, tonoplast ATPase and PPase in roots treated with exogenous SA were increased by 17.67%, 16.47% and 18.65%, respectively, compared with NaCl treatment. The results showed that exogenous SA could enhance the absorption of K +, Ca2 +, Mg2 + and decrease the Na + uptake in the roots of chrysanthemum by inducing proton pump activity under salt stress, so as to alleviate the damage of chrysanthemum to salt stress.