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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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    0541930 - MBÚ 2022 RIV NL eng J - Journal Article
    Rearte, T. A. - Celis-Pla, P. S. M. - Neori, A. - Masojídek, Jiří - Torzillo, G. - Gomez-Serrano, C. - Silva Benavides, A. M. - Alvarez-Gomez, F. - Abdala-Diaz, R. T. - Ranglová, Karolína - Caporgno, Martín - Massocato, T. F. - da Silva, J. C. - Al Mahrouqui, H. - Atzmuller, R. - Figueroa, F. L.
    Photosynthetic performance of Chlorella vulgaris R117 mass culture is moderated by diurnal oxygen gradients in an outdoor thin layer cascade.
    Algal Research-Biomass Biofuels and Bioproducts. Roč. 54, APR 21 (2021), č. článku 102176. ISSN 2211-9264. E-ISSN 2211-9264
    R&D Projects: GA MŠk(CZ) LO1416
    EU Projects: European Commission(XE) 727874 - SABANA; European Commission(CZ) ATCZ15
    Institutional support: RVO:61388971
    Keywords : Chlorophyll fluorescence monitoring * Outdoor mass cultivation * PSII down-regulation * Oxygen production * Photoadaptation
    Subject RIV: EE - Microbiology, Virology
    OECD category: Microbiology
    Impact factor: 4.401, year: 2020
    Method of publishing: Limited access
    https://www.sciencedirect.com/science/article/pii/S2211926420310444

    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.
    Permanent Link: http://hdl.handle.net/11104/0319435

     
     
Number of the records: 1