生命科学研究2012，Vol.16Issue(6)：521-525,5.
脱水和复水过程中金发藓(Polytrichum commune)与湿地匐灯藓(Plagiomnium acutum)叶绿素荧光特性变化的比较研究
Comparison on Alternation of Chlorophyll Fluoroscence Between Polytrichum commune and Plagiomnium acutum During Dehydration and Rehydration
摘要
Abstract
Polytrichum commune from relative drought habitat and Plagiomnium acutum from wet habitat were used as materials, and their chlorophyll fluroscence characteristics, such as ETR-PAR (Photosyntheti-cally Active Radiation-electron transportation rate) light respond curves, Fv/Fm (ratio of chlorophyll variation fluorescence), Y( II) (quantum yielding of PS II), qP (photochemical quenching) and NPQ (none-photochemical quenching) in diferent dehydration and rehydration treatments were detected by IMAGING-PAM analyzer (WALZ). In the procedure of desiccation, P. commune could sustain a higher inhibit light intensity (over 800 μmol/(m2·s)) and a stable ETR value (about 20), but inhibit light intensity of P. acutum menifested a dramatic decline and decreased to about 400 μmol/(m2·s), and ETR value could be inhibited to null. Fv/Fm, Y (II), qP of both two bryophyta species displayed a drop trends, nevertheless, P. commune contain a higher value. NPQ of two bryophytes manifested an obvious peak, and the peak of P. commune occured early and possess a lower alternative range. In the process of rehydration, inhibit light intensity and ETR value of both species recover rapidly, and P. commnue menifested slowly and was provide with less alternation. Fv/Fm, Y (II) of both species recover to normal state, and values of P. commune was higher. Results indicated that desiccation tolerance of bryophytes primarily rely on the repair ability in recovery process. But bryophytes from difer-ent habitat should reflect distinct response on desiccation, P. commune from relative drought habitat possess stronger desicccation tolerance than P. acutum from wet habitat.关键词
脱水与复水/叶绿素荧光光响应曲线/光系统Ⅱ光能转化效率/光系统Ⅱ光化学量子效率/光化学猝灭系数/非光化学猝灭系数Key words
dehydration and rehydration/ ETR-PAR (photosynthetically active radiation-electron transportation rate) curve/ Fv/Fm (ratio of chlorophyll variation fluorescence)/ Y (II) (quantum yielding of PS II)/ qP (photochemical quenching)/ NPQ (none-photochemical q分类
农业科技引用本文复制引用
杜晓濛,田向荣,李菁,石进校..脱水和复水过程中金发藓(Polytrichum commune)与湿地匐灯藓(Plagiomnium acutum)叶绿素荧光特性变化的比较研究[J].生命科学研究,2012,16(6):521-525,5.基金项目
国家自然科学基金面上项目(30470181) （30470181）
湖南省教育厅优秀青年项目(09B082) （09B082）
湖南省重点学科建设项目(JSU0713Z11) （JSU0713Z11）
湖南省高校科技创新团队支撑计划项目(201208Z02) （201208Z02）
