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

"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 CO2 m-2s-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-2s-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。"

"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 CO2 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 (Pof' 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'."