钙对NaCl胁迫下杂交酸模(Rumex K-1)幼苗叶片光抑制的减轻作用  

The Role of Calcium in Alleviating Photoinhibition in NaCl-stressed Leaves of Rumex K-1 Seedlings

作　　者：陈华新[1] 李卫军[2] 安沙舟[2] 高辉远[1] 

机构地区：[1]山东农业大学植物科学系,泰安271018 [2]新疆农业大学草业工程系,乌鲁木齐830052

出　　处：《植物生理与分子生物学学报》2003年第5期449-454,共6页Journal Of Plant Physiology and Molecular Biology

基　　金：国家重点基础研究发展规划项目 ( 199810 110 0 );国家自然科学基金项目 ( 3 9870 60 4)资助

摘　　要：一定浓度范围内的外源Ca2 + 能够减轻NaCl胁迫下杂交酸模 (RumexK 1)叶片的光抑制程度 ,其中浓度为 8mmol/L时效果最强。Ca2 + 增加NaCl胁迫下杂交酸模叶片光化学猝灭系数 (qP)、PSⅡ反应中心光能捕获效率 (Fv’/Fm’)和PSⅡ实际光化学效率 (ΦPSⅡ),降低QB 非还原性反应中心的相对含量。此外 ,Ca2 +还能降低NaCl胁迫下叶片的渗透势、增加可溶性蛋白和脯氨酸的含量 ,而对叶片水势无明显影响。探讨了Ca2 +The effect of calcium on photoinhibition was investigated in NaCl stressed Rumex K 1 leaves. Addition of calcium could alleviate photoinhibition in Rumex leaves. The alleviating effect increased with increasing calcium concentration in the Hoagland solution, and the maximum of its effect appeared at a concentration of 8 mmol/L (Fig.1). Under NaCl stress, photochemical quenching coefficient (q P), efficiency of light energy capture by open PS II reaction centers ( F v'/ F m'), and quantum yield of PS II electron transport (ФPS II decreased significantly in Rumex leaves. Addition of calcium (8 mmol/L) in the Hoagland solution significantly mitigated the decrease in q P, F v'/ F m' and ФPSⅡ (Fig.2), and lessened NaCl induced increase in the content of Q B non reducing PS II reaction centers (Fig.3). In addition, accession of calcium (8 mmol/L) decreased osmotic potential and increased the contents of soluble sugar and proline in NaCl stressed leaves (Fig.5), but had no significant effects on leaf water potential (Fig.4). Discussion was made on the possible mechanism of the alleviating effect of calcium on photoinhibition in NaCl stressed Rumex leaves.

关 键 词：杂交酸模 NACL胁迫 钙离子 叶绿素荧光 光抑制 

分 类 号：Q945.11[生物学—植物学]