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草地学报  2015 

盐胁迫对赖草离子吸收和运输的影响

DOI: 10.11733/j.issn.1007-0435.2015.03.012, PP. 510-516

Keywords: 赖草,盐胁迫,离子分配,选择性运输

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Abstract:

本试验用NaCl(0,100,200,300,400,500,600,700mM),Na2CO3和NaHCO3(0,50,75,100,150,200,300,400mM)对盆栽赖草幼苗(Leymussecelinus)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300mMNaCl以下不受影响,Na2CO3浓度低于150mM可以通过K+和Ca2+的协调来抵制Na+和Cl-的积累,NaHCO3浓度高于200mM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。

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