Effects of exogenous salicylic acid on ions contents and net photosynthetic rate in chrysanthemum under salt stress | 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
2011
Guo Chunxiao, Shandong Agricultural University, Jinan(China), College of Horticulture Science and Engineering | Wang Wenli, Shandong Agricultural University, Jinan(China), College of Horticulture Science and Engineering | Zheng Chengshu, Shandong Agricultural University, Jinan(China), College of Horticulture Science and Engineering
中国人. 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。
显示更多 [+] 显示较少 [-]英语. ObjectiveThe aim of this experiment was to analyze the alleviation mechanism of exogenous SA on chrysanthemum under salt stress. MethodThe 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.ResultThe 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 Na+ 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 Na+ contents by 53.41% in leaves; increased the contents of K+, Ca2+, Mg2+ by 67.97%, 79.40% and 89.32%, respectively, decreased Na+ 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+. ConclusionThese results indicated that exogenous SA may alleviate the damage of chrysanthemum seedlings from salt stress via ion selective absorption and transportation.
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