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为研究白刺(Nitratia tangutorum)对盐碱生境的适应能力,对二年生白刺实生苗进行了20组不同盐、碱浓度的胁迫处理。研究结果表明:随着盐、碱浓度加大,白刺叶片质膜所受伤害逐渐增加,在300mmol·L-1盐浓度下,白刺膜透性大幅度增加,电解质大量外渗,质膜的选择透过性遭到破坏;丙二醛作为膜脂过氧化的产物,它的变化规律与质膜透性的变化规律相一致,两者呈极显著正相关(r=0.796);白刺叶片中的超氧化物歧化酶、过氧化物酶和过氧化氢酶活性随着盐胁迫浓度和pH的增加而有不同程度的升高,增强了清除细胞内活性氧的能力,对膜系统起到了一定的保护作用;线性回归分析表明对白刺生长有重要影响的4个胁迫因素的重要性排序是盐浓度>pH>[HCO3-]>[CO32-]。综合各项指标,盐浓度在300mmol·L-1以下,pH小于10.59时,白刺能够较好耐受,具有较强的耐盐碱适应能力。
In order to study the adaptability of Nitratia tangutorum to saline-alkali habitat, twenty-year-old Nitratia tangutorum plants were treated with 20 different salt and alkali concentrations. The results showed that with the increase of salt and alkali concentration, the injury of the plasma membrane of Nitraria tangutorum leaves increased gradually. At the concentration of 300mmol·L-1, the permeability of Nitraria bidentata membrane increased significantly, the electrolyte extravasation, plasma membrane (P <0.05). Malondialdehyde (MDA), a product of membrane lipid peroxidation, is consistent with the change of plasma membrane permeability (r = 0.796) The activities of superoxide dismutase, peroxidase and catalase in leaves increased with the increase of salt stress concentration and pH, enhanced the ability of removing reactive oxygen species in cells, To a certain extent. The linear regression analysis showed that the order of importance of the four stress factors, which had an important influence on the growth of A. pricker, was salt concentration> pH> [HCO3 -]> [CO32-]. When the salt concentration is below 300mmol·L-1 and the pH is less than 10.59, the white pricker can tolerate better, and has stronger ability of adapting to salt and alkali.