以溶液培养的三角叶滨藜(Atriplex triangularis)为材料, 测定分析了在PEG诱导的渗透胁迫条件下, 适量的NaCl对其光合作用和水分吸收的影响, 以探讨环境溶液中NaCl对植物适应干旱的影响。结果表明, PEG诱导的渗透胁迫导致三角叶滨藜植株吸水困难、叶绿素含量降低、光合系统受损、生长受抑制、生物量减少; 而在PEG渗透胁迫的处理液中添加10–40 mmol·L–1NaCl可以明显降低植株水势和叶片渗透势, 维持较高的细胞膨压, 减缓PEG渗透胁迫对光合系统的破坏作用, 保证相对较高的光合速率和生长速度, 从而有效增强了三角叶滨藜对渗透胁迫的适应能力。
We investigated the effect of moderate NaCl on photosynthesis and water absorption in arrowleaf saltbush (Atriplex triangularis) under PEG-induced osmotic stress to understand the effect of NaCl on plant adaptation to drought stress. PEG-induced osmotic stress led to reduced water absorption and chlorophyll content, injured photosystem and growth and reduced biomass. The addition of NaCl at 10–40 mmol·L–1 could reduce water potential and osmotic potential,
maintain a high turgor, alleviate the destructive effect of osmotic stress to the photosystem, ensure a relatively high rate of photosynthesis and plant growth, and thus increase the adaptability of the plant to osmotic stress.
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