| 초록 |
Many aquatic photosynthetic organisms such as microalgae utilize carbon dioxide (CO2) and bicarbonate (HCO3-) as carbon sources through CO2 concentrating mechanism. In this point of view, we tried to verify the relationship between the extent of chemotactic response towards HCO3- and carbon dioxide fixation efficiency of microalgae. In this study, we observed the chemotactic behaviors of the wild-type and mutants of a motile microalga, Chlamydomonas reinhardtii CC125, in a microfluidic device. The results showed that the well-growing mutants had a tendency towards higher HCO3- concentration. In other words, the quantitative measurement of chemotactic responses of well-growing mutants showed higher values. In addition, the correlations between the chemotactic response and both the growth (△OD) and the photosynthetic efficiency (Y(II)) showed high linearities. In conclusion, the chemotactic response towards HCO3- and the CO2 fixation efficiency of microalgae are closely related. This result implies that this strategy can be used for high-throughput screening to identify superior microalgal strains with high CO2 fixation efficiency. |
