Green light as supplementary light for enhancing biomass production of Ettlia sp. and preventing population invasion from other microalgae
The biomass and carotenoid productivities of a freshwater microalga, Ettlia sp. YC001 (Chlorophyta, Chlamydomonadales), were investigated in continuous culture systems irradiated with various LEDs. Green light was effectively used by Ettlia sp. for its biomass growth compared to blue and red LED light. This effective use of green light was assumed to be beneficial for Ettlia sp., especially in competition with other microalgae. Thus, in a competition between Ettlia sp. and Chlorella vulgaris, Ettlia sp. out-competed C. vulgaris without losing any overall biomass productivity when green and white LEDs were used simultaneously. However, since Ettlia sp. also showed relatively low oxygen production under green light, further studies are needed on its photosynthesis and biomass production mechanisms. Notwithstanding, LEDs are potentially useful for identifying strain-specific photosynthetic characteristics of microalgae, thereby increasing their biomass productivity and controlling contamination from other microalgae in open culture systems.
KeywordsMicroalgae Green light Competition Biomass productivity
We would like to offer special thanks to Dr. HJ La, who, although no longer with us, was a warm and creative scientist and continues to inspire by his example.
Jae-Yon Lee and Hyun-Joon La made the primary conception and design of the study, experiments, analysis and interpretation of data, and drafting the article; Seong-Hyun Seo and Ankita Srivastava revised it critically; Chi-Yong Ahn, Chang Soo Lee, and Kwang-Guk An suggested important intellectual content; and Hee-Mock Oh has done final approval of the version to be submitted.
This research was supported by a grant from the Advanced Biomass R&D Center (ABC), a Global Frontier Program funded by the Korean Ministry of Science and ICT.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflicts of interest.
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