盐胁迫下外源SA对菊花体内离子含量和净光合速率的影响  

Effects of Exogenous Salicylic Acid on Ions Contents and Net Photosynthetic Rate in Chrysanthemum Under Salt Stress

作　　者：郭春晓[1] 王文莉[1,2] 郑成淑[1,3,2] 时连辉[3,2,4] 束怀瑞[1,3,5] 

机构地区：[1]山东农业大学园艺科学与工程学院,山东泰安271018 [2]山东农业大学国家缓控释肥工程技术研究中心,山东泰安271018 [3]作物生物学国家重点实验室,山东泰安271018 [4]山东农业大学资源与环境学院,山东泰安271018 [5]国家苹果工程技术中心,山东泰安271018

出　　处：《中国农业科学》2011年第15期3185-3192,共8页Scientia Agricultura Sinica

基　　金：国家"十二五"科技支撑计划项目(201BAD11B01;2011BAD11B02);国家苹果产业技术体系项目(CARS-28);山东省优秀中青年科学家科研奖励基金项目(BS2010NY019)

摘　　要：【目的】研究盐胁迫下外源SA对菊花植株的耐盐响应机理。【方法】采用SA叶面喷施法,研究NaCl胁迫下外源SA对菊花根、叶片和叶绿体中Na+、K+、Ca2+、Mg2+含量及叶片净光合速率的影响。【结果】NaCl处理的菊花根系、叶片和叶绿体中Na+的含量与对照相比均显著增加,而K+、Ca2+、Mg2+的含量均显著减少。在盐胁迫第10天时,SA+NaCl处理的菊花根系K+、Ca2+、Mg2+含量与NaCl处理相比,分别增加37.70%、16.44%和20.54%,而Na+含量则减少27.13%。SA+NaCl处理的菊花叶片K+、Ca2+、Mg2+含量与NaCl处理相比,分别增加56.52%、53.23%和87.53%,而Na+含量则减少53.41%,叶片Pn也增加40.74%。SA+NaCl处理的菊花叶片叶绿体中K+、Ca2+、Mg2+含量与NaCl处理相比,分别增加67.97%、79.40%和89.32%,而Na+含量则减少76.06%。与NaCl处理相比,SA+NaCl处理时,根系、叶片和叶绿体中的SK,Na、SCa,Na和SMg,Na均显著增加。相关性分析表明,Pn与Na+具有显著的负相关性;而与K+、Ca2+、Mg2+显著正相关。【结论】盐胁迫下外源SA可以通过调节菊花体内对K+、Ca2+、Mg2+的选择性吸收和运输,缓解盐胁迫对菊花植株的伤害程度。[ Objective ] The aim of this experiment was to analyze the alleviation mechanism of exogenous SA on chrysanthemum under salt stress. [ Method ] The effects of salicylic acid （SA） on contents of Na＋, K＋, Ca2＋, Mg2＋ in roots, leaves of chrysanthemum and net photosynthetic rate （Pn） were studied with spraying exogenous SA on leaves. [Result] The results showed that salt stress increased the content of Na＋, but reduced the contents of K＋, Ca2＋, Mg2＋ in roots and leaves of chrysanthemum. Exogenous SA treatment increased K＋, Ca2＋, Mg2＋ contents by 37.70%, 16.44% and 20.54%, respectively, decreased Nat content by 27.13% in the roots; increased the contents of K＋, Ca2＋, Mg2＋ and Pn by 56.52%, 53.23%, 87.53% and 40.74%, respectively, decreased Nat contents by 53.41% in leaves; increased the contents of K＋, Ca2＋, Mg2＋ by 67.97%, 79.40% and 89.32%, respectively, decreased Nat contents by 76.06% in the chrysanthemum at the 10th day after stress treatments. SK, Na, SCa, Na and SMg, Na were also significantly increased by exogenous SA under salt stress. Correlation analysis showed that the Pn has significant negative correlation with Na＋ and significant positive correlations with K＋, Ca2＋, Mg2＋. [Conclusion] These results indicated that exogenous SA may alleviate the damage of chrysanthemum seedlings from salt stress via ion selective absorption and transportation.

关 键 词：菊花 盐胁迫 水杨酸 净光合速率 

分 类 号：S682.11[农业科学—观赏园艺]