NaCl对渗透胁迫下三角叶滨藜光合作用和水分状况的调节  

Effect of NaCl on Photosynthesis and Water Status in Arrowleaf Saltbush Under Osmotic Stress

作　　者：柏新富[1] 卜庆梅[1] 谭永芹[1] 朱建军[1] 刘林德[1] 

机构地区：[1]鲁东大学生命科学学院,烟台264025

出　　处：《植物学报》2012年第5期500-507,共8页Chinese Bulletin of Botany

基　　金：国家重点基础研究发展计划(No.2009CB421303)

摘　　要：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10-40mmol·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 NaCI 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 NaCI 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.

关 键 词：三角叶滨藜 NACL 渗透胁迫 光合作用 水分吸收 

分 类 号：Q945[生物学—植物学]