盐胁迫及外源Ca^(2+)对白刺离子吸收、运输的影响  

Effect of salt stress and exogenous Ca^(2+) on ion absorption and transportation of Nitraria

作　　者：闫永庆[1] 袁晓婷[1] 刘威[1] 宣亚楠 张艳艳[1] 

机构地区：[1]东北农业大学园艺学院,哈尔滨150030

出　　处：《东北农业大学学报》2014年第3期71-78,共8页Journal of Northeast Agricultural University

基　　金：东北农业大学博士启动基金(2012RCB63);黑龙江省教育厅科学技术研究项目(11551052)

摘　　要：以唐古特白刺(Nitraria tangutorum Bobr.)为试验材料,研究不同浓度盐胁迫对白刺离子吸收和分布的影响及外源Ca2+的调控效应。结果表明,随盐浓度的升高,白刺单株生物量及叶片肉质化程度增加,根系对Na+、Cl-的吸收大幅增加,对K+、Ca2+的吸收则逐渐降低,且Na+、K+、Ca2+主要集中在地上部。添加外源Ca2+有效降低白刺根系对Na+的吸收,增强对K+、Ca2+的选择吸收,根、茎对K+、Ca2+的运输选择性高于Na+,有效降低茎、叶中Na+含量,说明离子区域化是盐生植物白刺的重要耐盐机制,外源Ca2+能有效降低植物体内Na+水平,缓解盐胁迫对植物的伤害。An experiment was conducted to study the effects of different concentrations of salt stress on ion uptake and distribution of Nitraria tangutorum Bobr. and the regulation effects of exogenous Ca2＋. The results showed that with the increase of salt concentration, single plant biomass and the degree of leaf succulence elevated, and the absorption of root for Na＋and Cl-substantial y increased, while for K＋and Ca2＋decreased, and Na＋, K＋and Ca2＋mainly concentrated in the shoot. Exogenous Ca2＋effectively reduced the Na＋absorption of roots and enhanced the selective absorption of K＋and Ca2＋. The transportion selectivity of K＋and Ca2＋in roots and stems were higher than that of Na＋, which was effective to reduce the Na＋content of stems and leaves. The results suggested that ion compartmentalization was an important salt tolerant mechanism of N. tangutorum, and exogenous Ca2＋ could effectively reduce the Na＋ content in plants and relieve salt stress damage on plant.

关 键 词：白刺 盐胁迫 CA2+ 离子吸收与运输 

分 类 号：Q948[生物学—植物学]