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Comparing pulse amplitude modulated (PAM) fluorometry with radiocarbon technique for determination of inorganic carbon fixation in Chlorella vulgaris (Trebouxiophyceae, Chlorophyta)
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SYSNO ASEP 0554361 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Comparing pulse amplitude modulated (PAM) fluorometry with radiocarbon technique for determination of inorganic carbon fixation in Chlorella vulgaris (Trebouxiophyceae, Chlorophyta) Author(s) Camargo, E. (BR)
Rossi, R. (BR)
Silva, J. (BR)
Miwa, A. (BR)
Prášil, Ondřej (MBU-M) RID, ORCID
Calijuri, M. (BR)
Lombardi, A. (BR)Source Title European Journal of Phycology. - : Taylor & Francis - ISSN 0967-0262
Roč. 57, č. 1 (2022), s. 18-28Number of pages 11 s. Language eng - English Country GB - United Kingdom Keywords electron-transport ; photosystem-ii ; c-14 uptake ; fluorescence ; photosynthesis ; microphytobenthos ; dioxide ; light ; phytoplankton ; absorption ; Carbon-14 ; chlorophyll fluorescence ; electron transport rate ; microalgae ; photophysiology ; photosynthesis ; primary production Subject RIV EE - Microbiology, Virology OECD category Microbiology R&D Projects GA18-07822S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support MBU-M - RVO:61388971 UT WOS 000637274600001 EID SCOPUS 85103878701 DOI 10.1080/09670262.2021.1885065 Annotation Integration of pulse amplitude modulated (PAM) fluorometry and conventional methods for estimating carbon assimilation in microalgae is important for physiological, ecological and economic purposes. In this study, we compared PAM fluorometry and carbon-14 (C-14) uptake techniques to estimate the carbon fixation rate in Chlorella vulgaris under controlled laboratory conditions. The key parameter for this comparison was the electron yield for carbon fixation (CYRILLIC CAPITAL LETTER EFe ), commonly assumed when converting electron transport rate (ETR) values into the chlorophyll-specific carbon fixation rate (P-B ). Additional analyses of maximum (phi(M) ) and effective (phi'(M) ) quantum efficiency of photosystem II, photochemical (qP) and non-photochemical (NPQ) quenching, and photosynthesis-irradiance response curves demonstrated that the photophysiology of C. vulgaris did not change after a 2-h incubation with (NaHCO3)-C-14 and Na2CO3 (control). The association of P-B obtained through the C-14 method (151 +/- 8.77 mu mol C [mg chl a](-1) h(-1)) with ETR (411 +/- 3.91 mu mol e(-) [mg chl a](-1) h(-1)) resulted in an average CYRILLIC CAPITAL LETTER EFe of 0.37 +/- 0.02 mu mol C [mu mol e(-)](-1), which is higher than theoretical CYRILLIC CAPITAL LETTER EFe values usually reported in the literature (e.g. 0.20 and 0.25). We attributed this discrepancy to a possible inaccuracy in ETR due to underestimated values of chlorophyll-specific absorption cross-section (a*) and the common assumption that only 50% of total light is absorbed by photosystem II. We here demonstrate the importance of associating chlorophyll fluorescence with other primary production techniques, so that adjustments to calculation procedures can be made in accordance to species-specific physiological traits and particularities regarding culturing conditions. Workplace Institute of Microbiology Contact Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231 Year of Publishing 2023 Electronic address https://www.tandfonline.com/doi/full/10.1080/09670262.2021.1885065?scroll=top&needAccess=true
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