Rapid screening test to estimate temperature optima for microalgae growth using photosynthesis activity measurements
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We have worked out a rapid 1-day test based on photosynthesis measurements to estimate suitable growth temperature of microalgae cultures. To verify the proposed procedure, several microalgae—Chlorella, Nostoc, Synechocystis, Scenedesmus, and Cylindrospermum—were cultured under controlled laboratory conditions (irradiance, temperature, mixing, CO2, and nutrient supply) to find the optima of photosynthetic activity using the range between 15 and 35 °C. These activities were recorded at each temperature step after 2 h of acclimation which should be sufficient as oxygen production and the PQ cycle are regulated by fast processes. Photosynthetic activity was measured using three techniques—oxygen production/respiration, saturating pulse analysis of fluorescence quenching, and fast fluorescence induction kinetics—to estimate the temperature optima which should correspond to high growth rate. We measured all variables that might have been directly related to growth—photosynthetic oxygen evolution, maximum photochemical yield of PSII, Fv/Fm, relative electron transport rate rETRmax, and the transients Vj and Vi determined by fast fluorescence induction curves. When the temperature optima for photosynthetic activity were verified in growth tests, we found good correlation. For most of tested microalgae strains, temperature around 30 °C was found to be the most suitable at this setting. We concluded that the developed test can be used as a rapid 1-day pre-screening to estimate a suitable growth temperature of microalgae strains before they are cultured in a pilot scale.
KeywordsChlorophyll fluorescence Electron transport rate Microalgae Photosynthesis measurements Rapid test Temperature optimisation
- F0, Fv, Fm
Minimal, variable, and maximal fluorescence in dark-adapted state
Maximal photochemical yield of PSII
Photosynthetic oxygen evolution and respiration
- OJIP curve
Fast Chl fluorescence induction kinetics
Photosynthetically active radiation
Relative electron transport rate through PSII
Rapid light-response curve
The authors thank Ms. Soňa Pekařová for technical assistance, Dr. Pavel Hrouzek and Dr. Michal Koblížek for revision of the manuscript and Mr. Jason Dean for language correction.
Karolína Ranglová, Gergely Lakatos, João Artur Câmara Manoel and Tomáš Grivalský carried out joint experiments, evaluated data and took a part in the preparation of the manuscript. Karolína Ranglová prepared the manuscript text and figures. Jiří Masojídek revised and finalized the manuscript.
This work received complex funding with partial support from National Sustainability Programme I of the Ministry of Education, Youth and Sports of the Czech Republic (project Algatech Plus LO1416) and in part by the EU programme Horizon 2020 (project SABANA, grant no. 727874).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
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