兩種文心蘭品種於光誘導期間之光保護與光抑制現象

Photoprotection and Photoinhibition During Light Induction in Two Oncidium Gower Ramsey Varieties

本研究量測文心蘭‘檸檬綠’(Oncidium Gower Ramsey‘Honey Angel’)及‘黃金之星’(Oncidium Gower Ramsey‘Golden Star’)於7種固定光量下之葉綠素螢光參數，得知兩品種適合光量為500μmol photon m-2 s-1以下的長時間(1 hr)照射，其暗回復快速及光抑制程度較低。人工光源的栽培技術，光量應介於300-500μmol photon m-2 s-1，以避免嚴重光抑制損壞光合系統。兩品種均不耐高光環境(1,000-2,000μmol photon m-2 s-1)，而導致過多能量產生，促使qE降低，提高qI，並增加光抑制比例。由於光抑制程度很容易在田間測得，應是一個田間可應用的生理監測指標。以上結果可提供文心蘭栽培管理、微環境營造及生理監測之參考。

The chlorophyll fluorescence parameters of Oncidesa Gower Ramsey ‘Honey Angel and ‘Golden Star’ varieties under seven irradiation gradients were studied. The results show that two varieties were suitable for long-term (1 hr) irradiation under 500 μmol photon m-2 s-1, indication of faster dark recovery and lower photoinhibition effect of photosystem. Thus, the light cultivate technology of the artificial light intensity should range from 300 to 500 μmol photon m-2 s-1 to avoid severe light inhibit damage to the photosynthetic system. The two varieties were both intolerant to high light environments, ranging from 1,000-2,000μmol photon m-2 s-1. High light intensities led to excessive energy reduced qE, and increased qI and the photoinhibition ratio. Since the photoinhibition effect is easy to measure in the field, it should be an ideal physiological monitoring index that can be applied in the field. The above results can provide references for Gower Ramsey cultivation management, micro-environment creation, and physiological monitoring.