赤色 LED 点滅光が Euglena の光合成速度に及ぼす影響

抄録

The objective of our study is to clarify the optimum irradiation conditions for the efficient cultivation of Euglena, in order to increase the yields. First, we measured the blinking light response curve of photosynthesis and investigated the effect of the blinking cycle on the photosynthesis, using red light emitting diodes (LEDs). Second, we determined the photosynthetic photon flux density (PPFD) value at which the photosynthetic efficiency was maximum. Here, we measured the difference in the photosynthetic rate of Euglena using red LEDs under blinking and continuous light conditions. In cases where the blinking cycle was 1.0 x 10^-3 s, there was no difference in the photosynthetic rate of Euglena between the two conditions. On the other hand, at a PPFD value of 35 μmol·m^-2·s^-1, the photosynthetic efficiency was the highest. In cases where the PPFD value ranged from 0 to 200 μmol·m^-2·s^-1, the photosynthetic rate increased rapidly. Then, it increased slightly and reached a saturation point at a PPFD value of 400 μmol·m^-2·s^-1.