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The chlorophyll fluorescence characteristics of plants in different irradiance and temperature
leaf spectral reflectance
|引用:||Adams, III W.W., Demmig-Adams, B., Logan, B.A., Barker, D.H., and Osmond, C.B. (1999). Rapid changes in xanthophylls cycle dependent energy dissipation and photosystem II efficiency in two vines, Stephania japonica and Smilax australis, growing in the understory of an open Eucalyptus forest. Plant, Cell and Environment, 22, 125-136. Adams, III W.W., Demmig-Adams, B., Rosenstiel T.N., and Ebbert, V. (2001). Dependence of photosynthesis and energy dissipation activity upon growth form and light environment during the winter. Photosynthesis Research, 67, 51-62. Adams, III W.W., Demmig-Adams, B., Rosenstiel, T.N., Brightwell, A.K., and Ebbert, V. (2002). Photosynthesis and photoprotection in overwintering pants. Plant Biology, 4, 545-557. Adams, III W.W., Ryanzarter, C., Ebbert, V., and Demmig-Adams, B. (2004) Photoprotective strategies of overwintering evergreens. BioScience. 54:41-49. Allen, D.J., and Ort, D.R. (2001). 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|摘要:||為了解不同光度及溫度對不同生態習性植物葉綠素螢光特性之影響，以芒果、玉米、甘藷、赤楊、皺葉黑葉芥藍與黃金芥藍為對象加以探討。結果顯示在不同光度及溫度下供試植物螢光參數之變化趨勢大致相同，唯幅度各異。其Fm´均隨光度上升及溫度下降而降低，其NPQ則反之，表示葉黃素循環會隨光度增加而逐漸啟動，且溫度越低熱消散能力越強。至於吸收光能之分配，低溫時Fv´/ Fm´之降低與過剩光能之增加無直接關係，故Fv´/ Fm´之降低應是光保護作用。玉米(C4植物)並無光呼吸，無法藉此排除過剩光能，故分配至熱消散的比例較C3植物大。此外尚發現，在低溫下，芒果在極低光照(20 μmol m-2s-1)，其PSII效能即會大幅向下調節，且分別與PRI及NPQ呈極高的正相關及負相關，且關燈後PRI的回復速度較Fv/Fm緩慢，推論芒果藉由較慢的葉黃素循環啟動及去環氧化回復速度，可抵抗冬天清晨突然出現的強光。芒果葉片之黎明Fv/Fm與PRI會隨黎明最低溫之下降而降低，此乃受低溫影響，大量A及Z會維持至隔日黎明。因PRI會受到黎明最低溫的影響，故在未照光前其值會隨溫度下降而變小，故ΔF/Fm´和PRI之關係隨季節而異。在照光下ΔF/Fm´會隨NPQ增加而直線降低，但是受溫度影響約略分成三群，在NPQ相同的情況下比較時，溫度愈低時所測得之ΔF/Fm´會愈低。由於黎明Fv/Fm之變化亦會隨溫度下降而降低，故當日實際光化學消散的下降比例以Fv/Fm -ΔF/Fm´之差值代表較佳。|
In order to understand the effects of irradiance and temperature on the chlorophyll fluorescence among different ecological habits plant species, mango, maize, sweet potato, Alnus formosana, and two varieties of Brassica oleracea (dark-green and light-green) were used as materials. The results indicated that almost the same tendency of chlorophyll fluorescence in responses to irradiance and temperature could be found among 6 species, however, the ranges varied with species. Among chlorophyll fluorescence parameters, Fm'' reduced with the rise of irradiance and the drop of temperature. But the converse tendency in response to the rise of irradiance and the drop of temperature was found in NPQ. These results indicated that the higher xanthophylls cycle and heat dissipation occurred under high irradiance and low temperature. For the allocation of absorbed light energy, the reduction of Fv´/ Fm´ was not directly related to the increase of excess light energy, rather than photoprotective. Maize, is a C4 plant, was unable to dissipate excess light energy by photorespiration, so it showed higher proportion of heat dissipation than C3 plants. In addition, in low temperature, the PSII efficiency of mango leaves would significantly down-regulate even the irradiance was extremely low (20 μmol m-2s-1). The PSII efficiency of mango leaves also showed higher positive and negative correlation with PRI and NPQ, respectively. After turning off the light, the recovery of PRI was slower than Fv/Fm. It suggested that mango could resist highlight which suddenly appeared in early morning in winter by slowly repaying depoxidation. At predawn, mango decline their Fv/Fm and PRI with the decrease of the minimum temperature, due to retained a large amount of the xanthophyll cycle pigment A and Z. Therefore, the regressionship between ΔF/Fm´ and PRI was varied with seasons. Under irradiance, ΔF/Fm´ reduced with the increase of NPQ, and it could divide roughly into three groups according to the minimum temperature of measured day. Compared with the same level of NPQ, the lower ΔF/Fm´ could be found at lower temperature. Because the Fv/Fm, measured at predawn, dropped with the decrease of temperature. So Fv/Fm - ΔF/Fm´ is significantly related to the decline proportion of photochemistry dissipation.
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