- 期刊
不同光量對文心蘭檸檬綠氣體交換與葉綠素螢光之影響
Effects of Gas Exchange and Chlorophyll Fluorescence on Oncidesa Gower Ramsey 'Honey Angel' under Different Irradiation
摘要
本研究量測文心蘭檸檬綠（Oncidesa Gower Ramsey 'Honey Angel'）於不同光量梯度下之氣體交換及葉綠素螢光參數，結果顯示檸檬綠具有高水分利用效率，同時具有較高的光飽和點（light saturation point, LSP）（1,200-1,500 μmol photon m^(-2) s^(-1)）及光補償點（light compensation point, LCP）（45.07±8.99 μmol photon m^(-2) s^(-1))，以及較低的暗呼吸速率（dark respiration rate, Rd）（1.04±0.12 μmol CO_2 m^(-2) s^(-1)）。在光化學效能方面，電子傳遞速率（electron transport rate, ETR）與淨光合速率（net photosynthesis rate, Pn）呈現顯著相關 （P ＜ 0.0001）。而高光下（1,200-2000 μmol photon m^(-2) s^(-1)），非光化學消散能量 （non-photochemical quenching, NPQ）比例佔全部能量之61%，顯示檸檬綠不耐高光，而其光合系統能隨著光量上升而調升非光化學消散能力。藉由葉綠素螢光量測的技術，具方便、快速及非破壞性等優點，監測檸檬綠生態生理的狀態，有助於瞭解光合系統的特性，以期應用於現行栽培技術，提高產量及品質。
並列摘要
The gas exchange and chlorophyll fluorescence parameters of Oncidesa Gower Ramsey 'Honey Angel' were measured under different irradiation gradients. The results show that 'Honey Angel' had high water use efficiency and high light saturation point (1,200-1,500 μmol photon m^(-2) s^(-1)), light compensation point (45.07±8.99μmol photon m^(-2) s^(-1)), and low dark respiration rate (1.04±0.12μmol CO_2 m^(-2) s^(-1)), suggesting that is difficult to grasp the production micro-environmental conditions. In terms of photochemical efficiency, similar to the photosynthetic system functions of other C4 and C3 vascular bundles plants, ETR of 'Honey Angel' was positively and significantly correlated with photosynthetic rate (P ＜0.0001) under high light (1,200-2000 μmol photon m^(-2) s^(-1)), the proportion of non-photochemical quenching energy accounted for 61% of the total energy, indicating that 'Honey Angel' was not resistant to high light, and its photosynthetic system could increase the non-photochemical quenching ability with the change of irradiation. Further studies on the photoprotection and photoinhibition mechanisms of 'Honey Angel' are needed to understand better ecological niche. The chlorophyll fluorescence measurement technology has the advantages of convenience, speed and non-destructiveness which can monitor the ecological and physiological state of' Honey Angel'. Understanding the characteristics of the photosynthetic system is expected, and apply to current cultivation techniques, and improve quantity and quality of 'Honey Angel'.