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題名 | 缺水對茶樹葉片光合組織光反應能力之影響 |
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作者姓名(中文) | 陳國任; 蔡文福; | 書刊名 | 臺灣茶業研究彙報 |
卷期 | 14 1995.07[民84.07] |
頁次 | 頁11-25 |
分類號 | 434.817 |
關鍵詞 | 葉片水勢; 缺水; 螢光; 水分裂解系統; 量子生產; 捕光色素系統; 光合組織; Leaf water potential; Water stress; Fluorescence; Water splitting system; Quantum yield; Light harvesting system; Photosynthetic apparatus; |
語文 | 中文(Chinese) |
中文摘要 | 四年生缽植茶樹放置於日╱夜溫度為30╱25℃之人工控制氣候室中生長,每天灌溉200毫升(正常處理)或每天只灌溉20亳升,使土壤逐步缺水。當葉片水勢降至-1.4∼-1.6Mpa時(輕度缺水),快相螢光釋放Fp及Fm值與正常葉片(-0.7Mpa)比較差異不明顯,表示PSⅡ氧化端水分裂解系統及還原端接受電子之能力不受影響。當葉片水勢降至-2.4∼-2.5Mpa時(中度缺水),Fm值不變,Fp值上昇,△Fp(Fm-Fp)值下降,顯示PSⅡ還原端電子傳遞部分受到抑制。葉片水勢降至-4.0Mpa時(嚴重缺水),Fm及Fp值皆下降,顯示QA接受或放出電子之能力已受嚴重抑制,同時PSⅡ量子生產效率(Φ2)也受到影響。葉片水勢降至-5.5Mpa時,快相螢光釋放曲線中FI、FD及Fp點完全消失,同或(F0)685值降下,葉片捕光色素系統已無法將光能傳遞至反應中心。 |
英文摘要 | Four-year old tea plants grown in 1/20m2 Wagner pots under the day/night temperature of 30/25℃ in phytotron. One set of the pots was irrigated with 200 ml of water/pot every day to maintain soil moisture content at the field capacity condition. Another set was irrigated with 20 ml of water/pot every day to limit the water supply gradually. Tea shoots were sampled for chlorophyll a fluorescence induction during the treatment. Results obtained were summarized as follows: The fast chlorophyll a fluorescence induction at leaf water potential of -1.4∼-1.5Mpa, Fp and Fm were similar to normal irrigated leaves (-0.7MPa). This indicated that PSⅡ electron transport (PSⅡ reducing site) and water splitting system (PSⅡ oxidizing site) were not inhibited by mild water stress. When leaf water potential decreased to -2.4∼-2.5MPa, Fm value was unchanged and Fp value increased. This indicated that PSⅡ electron transport was partially inhibited by moderate water stress. When leaf water potential decreased to -0.4MPa, Fm and Fp values also decreased indicating that activity of oxidizing site and reducing site of PSⅡ were inhibited by severe water stress. PSⅡ quantum yield efficiency (Φ2) was affected simultaneously. When leaf water potential decreased to-5.5MPa, fast chlorophyll a fluorescence of FI, FD and Fp disappeared and (Fo) 685 value decreased simultaneously indicating that light harvesting pigment system was not able to deliver photons to the reaction center. |
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