Sodium instead of potassium and chloride is an important macronutrient to improve leaf succulence and shoot development for halophyte Sesuvium portulacastrum

文献类型： 外文期刊

第一作者： Wang, Dongyang

作者： Wang, Dongyang;Wang, Haiyan;Han, Bing;Wang, Bin;Guo, Anping;Liu, Chongjing;Chang, Lili;Peng, Ming;Wang, Xuchu;Wang, Dongyang;Wang, Haiyan;Han, Bing;Wang, Bin;Liu, Chongjing;Wang, Xuchu;Zheng, Dong

作者机构：

关键词： Halophyte;Leaf succulence;Potassium ion;Salt stress;Sesuvium portulacastrum;Sodium chloride

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

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年卷期：

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收录情况： SCI

摘要： Soil salinity is contributed largely by NaCl but some halophytes such as Sesuvium portulacastrum have evolved to adapt salinity environment and demonstrate optimal development under moderate salinity. To elucidate the detail mechanisms of the great salt tolerance and determine the respective contributions of Na ~+, K ~+ and Cl ~- on the development of S. portulacastrum, morphological and physiological analysis were performed using plants supplied with 200 mM of different ions including cations (Na ~+, K ~+, Li ~+) and anions (Cl ~-, NO3-, Ac ~-) respectively. The results revealed that the salt-treated plants accumulated large amounts of sodium in both leaf and stem. There was a greater shoot growth in presence of external Na ~+ compared to K ~+ and Cl ~-. Na ~+ was found more effective than K ~+ and Cl ~- in cell expansion, leaf succulence, and shoot development. Flame emission and X-Ray microanalysis revealed the relative Na ~+ content was much higher than K ~+ and Cl ~- in both leaf and stem of well developed S. portulacastrum, leading to a higher Na ~+/K ~+ ratio. The effects of different ions on the development of S. portulacastrum were listed as the following: Na ~+ > NO3- > CK > Cl ~- > K ~+ > Ac ~- > Li ~+. These results demonstrated NaCl toxicity is attributable largely to the effect of Cl ~- but rarely to Na ~+, and thus sodium is concluded as a more important macronutrient than potassium and chloride for improving leaf succulence and shoot development of halophyte S. portulacastrum.

分类号： Q945

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