Ion Absorption and Distribution of Agriophyllum squarrosum Seedlings under NaCl Stress

Zhang Jiwei; Zhao Xin; Shi Yong; Chen Guoxiong; Li Xinrong

doi:10.7522/j.issn.1000-694X.2015.00015

Journal of Desert Research >

2016 , Vol. 36 >Issue 3: 702 - 707

DOI: https://doi.org/10.7522/j.issn.1000-694X.2015.00015

Ion Absorption and Distribution of Agriophyllum squarrosum Seedlings under NaCl Stress

Zhang Jiwei ,
Zhao Xin ,
Shi Yong ,
Chen Guoxiong ,
Li Xinrong

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1. Key Laboratory of Stress physiology and Ecology in Cold and Arid Regions of Gansu Province, Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences,Beijing 100049, China

Received date: 2014-12-04

Revised date: 2015-01-22

Online published: 2016-05-20

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Abstract

Agriophyllum squarrosum is an annual desert plant adapted to mobile sand dunes in arid and semi-arid regions of Central Asia. In this study the A. squarrosum seedlings of three months were subjected to salt stress by soaked in 0-400 mmol·L^-1 NaCl solutions (in 1/2 MS medium) for 7 days separately. We examined their water contents and main mineral ion contents in their roots,stems and leaves during salt stress. The experiment results indicated that the water content of A. squarrosum seedlings reduced gradually as NaCl concentration increased, but the Na⁺ and Cl^- content kept roes observably, the K⁺ content increased in the beginning and the Ca²⁺ content cut down in root, stem and leaf.In addition,the salt ion-selective absorption coefficient S_K,Na of stem and leave increased at the beginning and then decreased, the S_K,Na of root and stem is just showed on the opposite result, and both of them reaching a critical value at 200 mmol·L^-1. Which indicated that A. squarrosum could effectively inhibit the absorption and accumulation of Na⁺ in stem and leaf at 0-200 mmol·L^-1, and Na⁺ accumulated in the stem mainly through compartmentalization function when the NaCl concentration was greater than 300 mmol·L^-1. Thus stem is the major tissue of A. squarrosum response to high salt stress because of its ability to preventing Na⁺ carrying from root to leaf.

Key words： Agriophyllum squarrosum; salt stress; mineral ion; compartmentalization

Cite this article

Zhang Jiwei , Zhao Xin , Shi Yong , Chen Guoxiong , Li Xinrong . Ion Absorption and Distribution of Agriophyllum squarrosum Seedlings under NaCl Stress[J]. Journal of Desert Research, 2016 , 36(3) : 702 -707 . DOI: 10.7522/j.issn.1000-694X.2015.00015

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