中文摘要：

通过盆栽试验，采用原子吸收分光光度法和非损伤微测技术，研究了NaHCO3胁迫（300mmol·L^-1）对大洋洲滨藜、四翅滨藜和宁夏枸杞3种灌木离子吸收及运转的影响．结果表明：随着NaHCO，浓度升高，两种滨藜和宁夏枸杞叶片中Na^＋含量升高，300mmol·L—Nail—CO3胁迫下，宁夏枸杞叶肉细胞Na^＋的外排增加，两种滨藜净Na^＋外排降低；随着胁迫时间的延长，大洋洲滨藜和宁夏枸杞叶片的K^＋含量下降，Na^＋／K^＋升高，四翅滨藜叶片K^＋含量升高，Na^＋／K^＋降低；随着浓度的升高，宁夏枸杞叶片积累Ca^2＋减少，Na^＋／Ca^＋高于对照，叶肉细胞Ca^2＋外排；两种滨藜叶Ca2＋含量总体呈升高趋势，叶肉细胞can表现为内流．在NaHCO3胁迫下，3种灌木通过不同的策略来消除Na^＋毒害．宁夏构杞叶片Na^＋的积累抑制了对Ca^2＋的吸收；两种滨藜Ca^2＋的内流促使细胞质中游离Ca^2＋增加，增加的细胞质[Ca^2＋]cyt防治质膜H^＋-AT—Pase去极化，限制K^＋的外排，从而维持细胞内Na^＋／K^＋的平衡，其中四翅滨藜调控Na^＋／K^＋平衡的能力较强．

英文摘要：

We detected absorption and transportation of ions in the leaves of Atriplex nummularia, Atriplex canescens and Lycium barbarum under NaHCO3 stress （300 mmol. L^-1 ） by using atomic absorption spectrophotometry and non-invasive ion flux measurement. The results showed that leaves of the A. nummularia, A. canescens and L. barbarum exhibited a high capacity to induce the Na^＋ accumulation when compared with that of control. The higher the concentration of NaHCO3 treatment, the more Na^＋ accumulated in the leaves of the three plants under experimental condition. L. barbarum showed a higher Na^＋ efflux in the mesophyll cells, whereas A. nummularia and A. canescens showed a relative lower efflux. A lower K＋ content and a higher Na^＋/K^＋ ratio were detected in leaves of A. nummularia and L. barbarum. However, a higher K^＋ content and a lower Na^＋/K^＋ ratio were seen in leaves of A. canescens. Due to induction of Ca^2＋ efflux under the NaHCO3 treatment, a lower Ca2. content and a higher Na^＋/Ca^2＋ratio were observed in L. barbarum. On the contrary, a higher Ca^2＋ influx was observed in A. nummularia and A. canescens. These results suggested that the three shrubs species had different Na^＋ segmentation strategies. The accumulation of Na^＋ inhibited Ca^2＋ absorption in leaves of L. barbarum, while in the A. nummularia and A. canescens, Ca2＋ influx induced [ Ca^2＋] cyt which preserved a less-depolarized PM and then inhibited K efflux. The maintaining of cellular K^＋/Na^＋ homeostasis in A. nummularia and A. canescens might be achieved by the induction of [ Ca^2＋ ] eyt under the NaHCO3 treatment.