NaCl胁迫增强杂交酸模(Rumex K-1)幼苗叶片光系统Ⅱ的耐热性  

NaCl Stress Increases the Heat Tolerance of PSII in Leaves of Rumex K-1 Seedlings

作　　者：陈华新[1] 安沙舟[2] 李卫军[2] 高辉远[1] 

机构地区：[1]山东农业大学生命科学学院,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》2004年第3期345-350,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(No.1998010100);国家自然科学基金项目(No.39870604)资助

摘　　要：NaCl胁迫对杂交酸模幼苗光系统Ⅱ(PS Ⅱ)的最大光化学效率没有影响,但是增强了PS Ⅱ的耐热性。热胁迫条件下,与未经盐胁迫处理的叶片相比,经NaCl 200 mmol/L处理的杂交酸模幼苗叶片,其PS Ⅱ最大光化学效率下降较小,反映OEC受伤程度的指标Fk/Fj上升较小。此外,光化学猝灭系数(qp)、PS Ⅱ反应中心光能捕获效率(Fv’/Fm’)、PS Ⅱ光化学转换效率(ΦPS Ⅱ)的下降以及QB-非还原性反应PS Ⅱ反应中心的相对含量上升程度也较小。探讨了盐胁迫增强杂交酸模幼苗叶片PS Ⅱ耐热性的可能机理。By measuring chlorophyll fluorescence, the effects of NaCl treatment on the maximal efficiency and heat tolerance of PS Ⅱ were examined in leaves of Rumex seedlings. NaCl 200 mmol/L treatment had no effect on the maximal efficiency of PS Ⅱ (Fig. 2), but increased the heat tolerance of PS Ⅱ in Rumex leaves. Compared with control leaves, the heat stress-induced decrease in Fv/Fm and the increase in Fk/Fj ratio were less in NaCl-treated leaves (Fig.3). In addition, the heat stress-induced decrease in photochemical quenching (qp), the efficiency of excitation energy capture by open PS Ⅱ reaction center (Fv'/Fm') and the quantum yield of electron transport (Φ PS Ⅱ) were less in NaCl-treated leaves (Fig.4). Moreover, the increase in the QB-non-reducing PS II reaction center content was less in NaCl-treated leaves than in control leaves (Fig.5). Discussion was made on the possible mechanisms of the increase in the heat tolerance of PSII in NaCl-treated leaves.

关 键 词：杂交酸模 NACL胁迫 热胁迫 叶绿素荧光 

分 类 号：Q945[生物学—植物学]