通过盆栽试验,研究了对盐胁迫具不同抗性水平反应的作物大麦和菠菜,在不同盐分离子种类Na₂CO₃和NaCl₃、个盐分水平(2.0,3.5,5.0gkg^-1)条件下的生长、生理指标变化,揭示其对盐胁迫的不同适应机理。结果表明,随土壤盐浓度的升高,大麦的株高、有效分蘖数、产量和生物量均有所下降,菠菜生长受到的抑制状况更加明显。随土壤盐浓度的升高,大麦叶片丙二醛(MDA)的含量逐渐增加,Na₂CO₃处理的叶片中MDA含量最高。与大麦相比,菠菜在盐胁迫下,更多的Na⁺通过根部向地上部运输,使叶中积累了更多的Na⁺。大麦有较强的阻止盐分离子向叶片运输、维持叶片正常功能的能力。Na₂CO₃更易对植株叶片产生伤害。

Pot experiments were conducted in greenhouse on effects of salts different in type and concentration on growth and physiological indexes of crops to find out mechanisms of their adaptability and tolerance to salt.The results showed that plant height, number of effective tillers, yield and biomass of the ground parts of barley dropped along with the increasing soil salt concentration and the growth of spinach was inhibited even more significantly.The content of malondialdehyde(MDA) in barley leaves increased with the increasing NaCl concentration and reached summit under Na₂CO₃ stress.Compared with barley, more Na⁺ was transported through roots to the ground parts and accumulated in spinach leaves under salt stress. Barley has the capability of restraining transportation of salt ions to leaves and sustaining normal function of leaves.Na₂CO₃ is more harmful to leaves of the plants.

* 中国科学院农业科技开发研究(NK十五-A-06)项目;国家重点基础研究发展规划项目(G1999011803);国家“863”项目(2002AA2Z4061)资助