盐胁迫下沙米(Agriophyllum squarrosum)矿质离子吸收与分配特征

张继伟; 赵昕; 石勇; 陈国雄; 李新荣

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

中国沙漠 >

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

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

生物与土壤

盐胁迫下沙米(Agriophyllum squarrosum)矿质离子吸收与分配特征

张继伟 ,
赵昕 ,
石勇 ,
陈国雄 ,
李新荣

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1. 中国科学院寒区旱区环境与工程研究所甘肃省寒区旱区逆境生理生态重点实验室, 甘肃兰州730000;
2. 中国科学院大学, 北京 100049

张继伟(1988-),男,河南郸城人,硕士研究生,研究方向为荒漠植物抗逆分子与生理学。E-mail:zhangjiwei@lzb.ac.cn

收稿日期: 2014-12-04

修回日期: 2015-01-22

网络出版日期: 2016-05-20

基金资助

国家重点基础研究发展计划项目(2013CB429904);国家自然科学基金项目(41201048)

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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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摘要

沙米(Agriophyllum squarrosum)是生长在流动沙地上的植物,主要分布在中亚干旱、半干旱地区。以室内生长3个月的沙米幼苗为材料,经0~400 mmol·L^-1 NaCl溶液胁迫处理7 d,检测植株的含水量及主要矿质离子在根茎叶的分布、积累和运输特征。结果表明:随着盐浓度的增加,沙米幼苗的含水量持续降低;体内Na⁺、Cl^-的含量不断升高,K⁺在根茎中先升高后降低,Ca²⁺在各组织均呈下降趋势;此外,茎与叶的盐离子选择吸收系数S_K,Na先升高后降低,根与茎S_K,Na先降低后升高,并且均在200 mmol·L^-1时达到临界值。盐浓度在0~200 mmol·L^-1时,沙米根部的Na⁺吸收持续增加,能够有效地抑制Na⁺向地上部分的运输和积累;在盐浓度大于300 mmol·L^-1时,Na⁺主要通过区隔化作用积累在茎部,即在高盐胁迫下茎部是沙米截留盐分避免其向上运输的主要部位。

关键词： 沙米(Agriophyllumsquarrosum); 盐胁迫; 矿质离子; 区隔化

本文引用格式

张继伟 , 赵昕 , 石勇 , 陈国雄 , 李新荣 . 盐胁迫下沙米(Agriophyllum squarrosum)矿质离子吸收与分配特征[J]. 中国沙漠, 2016 , 36(3) : 702 -707 . DOI: 10.7522/j.issn.1000-694X.2015.00015

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

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