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Photosynthetic performance of Chlorella vulgaris R117 mass culture is moderated by diurnal oxygen gradients in an outdoor thin layer cascade
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SYSNO ASEP 0541930 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Photosynthetic performance of Chlorella vulgaris R117 mass culture is moderated by diurnal oxygen gradients in an outdoor thin layer cascade Author(s) Rearte, T. A. (AR)
Celis-Pla, P. S. M. (CL)
Neori, A. (IL)
Masojídek, Jiří (MBU-M) RID, ORCID
Torzillo, G. (IT)
Gomez-Serrano, C. (ES)
Silva Benavides, A. M. (CR)
Alvarez-Gomez, F. (ES)
Abdala-Diaz, R. T. (ES)
Ranglová, Karolína (MBU-M) ORCID
Caporgno, Martín (MBU-M)
Massocato, T. F. (BR)
da Silva, J. C. (BR)
Al Mahrouqui, H. (ES)
Atzmuller, R. (AT)
Figueroa, F. L. (ES)Article number 102176 Source Title Algal Research-Biomass Biofuels and Bioproducts. - : Elsevier - ISSN 2211-9264
Roč. 54, APR 21 (2021)Number of pages 13 s. Language eng - English Country NL - Netherlands Keywords Chlorophyll fluorescence monitoring ; Outdoor mass cultivation ; PSII down-regulation ; Oxygen production ; Photoadaptation Subject RIV EE - Microbiology, Virology OECD category Microbiology R&D Projects LO1416 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support MBU-M - RVO:61388971 UT WOS 000632338300016 EID SCOPUS 85099225640 DOI 10.1016/j.algal.2020.102176 Annotation Dissolved oxygen concentration is a critical point for microalgae in large scale cultivation systems. Highly productive cultures inevitably generate a build-up of oxygen gradients along the reactor which can affect photosynthetic performance. In this study, a fast-growing strain of Chlorella vulgaris R117 was cultured outdoors in a thin-layer cascade during a one-week trial reaching a biomass productivity of 4 g DW L-1 d(-1) (27 g DW m(-2) d(-1)). High photosynthetic activity led to oxygen oversaturation of up to 400% in some parts along the culture units at midday. The aim was to examine the effect of high dissolved oxygen concentration on diurnal changes in the photosynthetic performance and growth of the Chlorella culture using multi-technique approach. Photosynthetic activity of Chlorella R117 culture was estimated in situ and ex situ using oxygen production and in vivo Chl a fluorescence measurements, which showed good correlation. The rates of electron transport and of oxygen production were related, but the values of the mu mol(electrons)/mu molO(2) ratio was higher than predicted, suggesting the probable involvement of electron and oxygen consuming processes such as photorespiration and Mehler reaction. These processes probably function as photoprotective mechanisms, since no photodamage was observed in the Chlorella R-117 cultures. Depression (down-regulation) of photosynthetic activity due to the exposition to high dissolved oxygen concentration along the cascade area over time was observed. The usefulness of on-line measurements was demonstrated to obtain immediate and in-situ information on the physiological status of the culture. This data can be used in models of operation control for large-scale microalgae production units. Workplace Institute of Microbiology Contact Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S2211926420310444
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