ユーグレナの光合成生育に与える光質とCO_2濃度の影響

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World population is rapidly increasing, while the current food production cannot meet the need of the exponentially growing population. Accordingly, we are planning to develop a new food resource system by photosynthetically culturing a microalga Euglena gracilis. Moreover, it is aimed to reduce the excessive CO2 in the atmosphere by making use of culturing Euglena. As a fundamental study on this new food resource system, this paper investigated the effect of light quality and CO2 concentration on photosynthetic growth of Euglena. Light emitting diodes (LEDs) were used as red and blue light sources to examine the effect of light quality. On the air condition (with 0.04 % CO2), red and blue (PPF ratio = 9:1) LEDs showed the best effect on the growth of Euglena, while blue LEDs the worst. On the condition of high CO2 (with 10 % CO2), no significant difference was found in the growth of Euglena among all of the light quality treatments. Chlorophyll content and Chlorophyll a/b ratio may account for these results. On the air condition with blue LEDs, energy level of photons is higher than those in other light quality treatments. The synthetic amount of protein of photosystem II (PS II) is more than the destructive one, and consequently the amount of protein in Chlorophyll b increased. Thus Chlorophyll a/b ratio decreased with the increase of Chlorophyll b. As a result, photosynthetic growth of Euglena decreased due to the decrease of photosynthetic activity. In contrast, on the condition of high CO2, since Euglena does not have the mechanism of CO2 concentration, much CO2 available for reduction presented in cells. Thus by increasing the CO2 reduction and photosynthetic activity, Euglena in high CO2 grew better than in the air.
生態工学会の論文
2007-01-31

ユーグレナの光合成生育に与える光質とCO_2濃度の影響

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