心叶日中花对盐胁迫的生理响应

Physiological Response of Salt Stress on Mesembryanthemum Cordifolium L.f.

在本研究中,为探索以心叶日中花(Mesembryanthemum cordifolium L.f.)对盐胁迫的生理响应,以心叶日中花水培苗为材料,经不同浓度Na Cl溶液处理(50mmol/L、100mmol/L、150mmol/L、200mmol/L、250mmol/L),检测叶片的相对电导率、丙二醛含量(MDA)、过氧化物酶活性(POD)、抗坏血酸过氧化物酶(APX)活性、过氧化氢酶(CAT)活性等各项生理生化指标。结果表明,心叶日中花叶片相对电导率随Na Cl溶液浓度的升高而增加,MDA含量不断增大。盐胁迫显著提高了心叶日中花叶片中POD的活性,随着盐浓度的增加,CAT与APX活性呈现出先增大后减小的规律。由此可见,心叶日中花在生理上具有较强的耐盐性。

This research aims to explore the physiological response of salt stress on Mesembryanthemum cordifolium L.f..After treatment with different concentrations of NaCl solution （50mmol/L, 100mmol/L, 150mmol/L, 200mmol/L,250mmol/L）, relative electrical conductivity of leaves, MDA, POD, activities of APX, and activities of CAT are measured on Mesembryanthemum cordifolium L. f.. Results show as concentrations of NaCl solution increase, the relative electrical conductivity of leaves and MDA content rise gradually. Salt stress significantly improves the POD＇ s activity among leaves of Mesembryanthemum cordifolium L. f.. And with the increase of salt concentration, APX activity increases first and then decreases. Therefore, Mesembryanthemum cordifolium L. f. presents relatively strong salt tolerance in physiology.