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   

  1. 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   

  1. 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:

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 NaHCO3 stresses. The restricting Na+ capability of root increased with the increases of NaCl, Na2CO3 and NaHCO3 concentrations. 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 NaHCO3 concentrations, 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

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