Effects of Salt Stress on the Ions Uptake and Transport of Leymus secalinus Seedling

doi:10.11733/j.issn.1007-0435.2015.03.012

Acta Agrestia Sinica ›› 2015, Vol. 23 ›› Issue (3): 510-516.DOI: 10.11733/j.issn.1007-0435.2015.03.012

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Effects of Salt Stress on the Ions Uptake and Transport of Leymus secalinus Seedling

DU Li-xia, ZHU Hui-sen, DONG Kuan-hu, FAN Peng-peng, SUN Jian-ping

College of Animal Science and Technology, Shanxi Agricultural University, Taigu, Shanxi Province 030801, China

Received:2014-08-04 Revised:2014-12-02 Online:2015-06-15 Published:2015-07-02

盐胁迫对赖草离子吸收和运输的影响

杜利霞, 朱慧森, 董宽虎, 樊鹏鹏, 孙建平

山西农业大学动物科技学院, 山西太谷 030801

通讯作者: 董宽虎
作者简介:杜利霞(1978-),女,内蒙古武川人,博士,副教授,主要从事种质资源及牧草育种方面的研究,E-mail:dulixia0328@126.com
基金资助:
山西省科技攻关项目(20140311013-2);校创新基金项目(2006056)资助

Abstract

Abstract:

A study on ions uptake and transport in the different parts of Leymus secalimus seedling was conducted under the different concentrations of NaCl(0,100,200,300,400,500,600,700 mM), Na₂CO₃ and NaHCO₃ (0,50,75,100,150,200,300,400 mM)stress in the greenhouse experiment. The results showed that the Na⁺ of acrial part was higher than roots; the change of Cl^- was opposite to that of Na⁺ under NaCl, Na₂CO₃ and NaHCO₃stresses. The restricting Na⁺capability of root increased with the increases of NaCl, Na₂CO₃ and NaHCO₃concentrations. Seedlings of Leymus secalinus could grow normally with the NaCl stress of less than 300 mM, but it was inhibited at more than 200mM NaHCO₃ stress. Under 150 mM Na₂CO₃ stress, seedling of Leymus secalinus accumulated K⁺and Ca²⁺ in order to inhibit the increases of Na⁺ and Cl^-. Na/K ratio increased with the increases of NaCl, Na₂CO₃, and NaHCO₃concentrations, but the increasing amount of Na/K in root were higher than in acrial part. Therefore, the salt-tolerant mechanism of Leymus secalinus was that root system inhibited the transportation of Na⁺.

Key words: Leymus secalinus, Salt stress, Ions distribution, Selective transportations

摘要：

本试验用NaCl(0,100,200,300,400,500,600,700 mM),Na₂CO₃和NaHCO₃(0,50,75,100,150,200,300,400 mM)对盆栽赖草幼苗(Leymus secelinus)在温室进行胁迫,通过研究其不同部位离子含量和离子的选择性运输,分析探讨赖草的耐盐生理。结果表明:NaCl,Na₂CO₃和NaHCO₃胁迫后,赖草幼苗根系的Na⁺含量均高于茎叶的含量,Cl^-含量是茎叶高于根系,根系的限制Na⁺能力随盐浓度的增加而增大。赖草幼苗在300 mM NaCl以下不受影响,Na₂CO₃ 浓度低于150 mM可以通过K⁺和Ca²⁺的协调来抵制Na⁺和Cl^-的积累,NaHCO₃浓度高于200 mM时,茎叶Na⁺和Cl^-含量增加,受胁迫严重。随盐浓度的增加,Na/K比增加,但茎叶的增加量小于根系,说明赖草的耐盐方式是通过根系限制Na⁺向茎叶运输,从而避免或减轻Na⁺对茎叶的损伤。

关键词: 赖草, 盐胁迫, 离子分配, 选择性运输

CLC Number:

Q945.78

DU Li-xia, ZHU Hui-sen, DONG Kuan-hu, FAN Peng-peng, SUN Jian-ping. Effects of Salt Stress on the Ions Uptake and Transport of Leymus secalinus Seedling[J]. Acta Agrestia Sinica, 2015, 23(3): 510-516.

杜利霞, 朱慧森, 董宽虎, 樊鹏鹏, 孙建平. 盐胁迫对赖草离子吸收和运输的影响[J]. 草地学报, 2015, 23(3): 510-516.

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Effects of Salt Stress on the Ions Uptake and Transport of Leymus secalinus Seedling

盐胁迫对赖草离子吸收和运输的影响

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