《植物生理学报》 2016, 52(4): 569-574

NaCl胁迫下沙芥的渗透调节作用

岳利军¹, 崔彦农¹, 袁坤¹, 康建军², 王锁民^1,∗

¹兰州大学草地农业科技学院, 草地农业生态系统国家重点实验室, 兰州730020; ²中国科学院寒区旱区环境与工程研究所内陆河流域生态水文重点实验室, 兰州730000

通信作者：王锁民；E-mail: smwang@lzu.edu.cn

摘　要：

本文系统分析了荒漠资源植物沙芥在不同浓度NaCl下的渗透调节作用。结果表明, 随外加NaCl浓度从25 mmol•L^-1升高至200 mmol•L^-1, Na⁺、Cl^-、脯氨酸和总无机离子的含量及其对叶渗透势的贡献不断升高, K⁺和可溶性糖的含量及其贡献先降低后升高, SO₄^2-和PO₄^3-的含量不断升高但其贡献变化不大; Na⁺、Cl^-和K⁺对叶渗透势的贡献交替位列前三, 可溶性糖位居第四。由上可知, 沙芥主要通过积累无机离子特别是Na⁺和Cl^-进行渗透调节以抵御外加NaCl的渗透胁迫。

关键词：沙芥; 渗透调节; 渗透胁迫; NaCl

收稿：2016-01-20   修定：2016-03-11

资助：国家自然科学基金(31101750和31360086)和兰州大学中央高校基本科研业务费专项资金(lzujbky-2013-200)。

The osmotic adjustment in Pugionium cornutum subjected to salt stress

YUE Li-Jun¹, CUI Yan-Nong¹, YUAN Kun¹, KANG Jian-Jun², WANG Suo-Min^1,*

¹State Key Laboratory of Grassland Agro-Ecosystems, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730020, China; ²Key Laboratory of Inland River Basin Ecohydrology, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Science, Lanzhou 730000, China

Corresponding author: WANG Suo-Min; E-mail: smwang@lzu.edu.cn

Abstract:

The osmotic adjustment traits of Pugionium cornutum under osmotic stress induced by different NaCl concentrations (25, 50, 100 and 200 mmol•L^-1) were investigated. The results show that, with NaCl concentrations increase from 25 to 200 mmol•L^-1, the concentration of Na⁺, Cl^-, proline and total inorganic ions and their contribution to leaf osmotic potential all increased, the concentration and contribution of K⁺ and soluble sugar firstly decreased and then increased, the concentration of SO₄^2- and PO₄^3- both increased but there were little change in their contribution. The contribution of Na⁺, Cl^- and K⁺ to leaf osmotic potential were in the top three, and the contribution of soluble sugar ranked fourth. In conclusion, inorganic ions, especially Na⁺ and Cl^-, were mainly accumulated and used for osmotic adjustment in P. cornutum exposed to osmotic stress induced by NaCl.

Key words: Pugionium cornutum; osmotic adjustment; osmotic stress; NaCl