Estimation of Light Compensation Point for Low Light Irradiation Storage of Harvested Lettuce (Lactuca sativa L.)

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  • Uchino Toshitaka
    Laboratory of Postharvest Science, Division of Bioproduction System Science, Department of Bioproduction Environmental Science, Faculty of Agriculture, Kyushu University
  • Suzuki Mizue
    Laboratory of Agricultural Process Engineering, Department of Agricultural Engineering, Graduate School of Bioresource and Bioenvironmental Science, Kyushu University
  • Harada Fumika
    Laboratory of Agricultural Process Engineering, Department of Agricultural Engineering, Graduate School of Bioresource and Bioenvironmental Science, Kyushu University
  • Hu Wenzhong
    Laboratory of Postharvest Science, Division of Bioproduction System Science, Department of Bioproduction Environmental Science, Faculty of Agriculture, Kyushu University
  • Hori Yoshiaki
    Laboratory of Postharvest Science, Division of Bioproduction System Science, Department of Bioproduction Environmental Science, Faculty of Agriculture, Kyushu University

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  • 収穫後サラダナの弱光照射貯蔵のための光補償点推定法
  • シュウカク ゴ サラダナ ノ ジャクコウ ショウシャ チョゾウ ノ タメ ノ ヒカリ ホショウテン スイテイホウ

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Abstract

The light compensation point was considered as the optimum incident light intensity for storage of green plants under the condition of very low light irradiation (Kozai et al., 1996). However it was obtained from the complicated experiment under various light intensity in previous reports (Fujiwara et al., 1999). A simple theoretical method for estimation of the light compensation point was developed. Namely, the light compensation point lc was derived from the simple equation of φIc＝Rd under the condition of low light irradiation, where φ is the quantum yield; Rd the dark respiration rate. As φ is considered as O.0891 mol CO2 mol quanta－i regardless of species, the light compensation point can be obtained by the equation when the dark respiration rate is determined. The estimated value of the light compensation point was agreed approximately with the experimental value using harvested lettuce independently of the experimental condition. lt is suggested that the developed method may be suitable for the estimation of the light compensation point of other green plant.

光補償点は弱光照射貯蔵において品質維持のために最も良い光強度とさ蔓ている搬の値を見つけるためには煩雑な実験を行わなければならない．著者らは弱光照一下で貯蔵中の青果物の光補償点を暗呼吸速度から簡便に見出す方法を考案した．光補償点の推定値はサラダナの弱光照射貯蔵で得られた実験値と比較した結果，比較的よい一致が見られた．この方法はサラダナ以外の青果物の弱光照射貯蔵時の光補償点算出にも利用可能と思われる．

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