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Identifier

000438775

Title

Μεταβολική και λειτουργική διαφοροποίηση του χλωροφύκους Chlorella vulgaris σε διαφορετικές εντάσεις φωτισμού και διαφορετικές συγκεντρώσεις CO2

Alternative Title

Metabolic and functional differentiation of the green alga Chlorella vulgaris at different light intensities and different CO2 concentrations

Author

Μουντουράκης, Φανούριος Ε.

Thesis advisor

Κοτζαμπάσης, Κυριάκος

Reviewer

Πυρίντσος, Στέργιος
Μόσχου, Παναγιώτης

Abstract

In the context of the present work was studied the differentiation in the molecular structure and function of the photosynthetic apparatus of the unicellular green alga Chlorella vulgaris at different light intensities and at different extreme CO₂ concentrations, in completely autotrophic conditions, aiming at the determination of optimal biomass production. The results showed that Chlorella vulgaris reaches its biomass maximum at light intensities between 50-100 μmol m^-2 s^-1 and a CO₂ concentration of 30%. The optimal cultivation time in such systems is estimated at around 5-6 days, where we record about 400% increase in microalgal biomass, capturing extreme CO₂ concentrations. In the treatments of the present work, we did not observe significant differences of lipids and carbohydrates in the biomass of the microalgae. However, the results obtained from the analysis of biomass at the end of the experimental process, showed in general an increase in lipids as the light intensity decreases (and in complete darkness) and as the CO₂ concentration increases simultaneously. Carbohydrates seems to have the highest values in high light conditions (200-400 μmol m^-2 s^-1) and extreme CO₂ concentrations (60% CO₂). All of the above suggest that Chlorella vulgaris not only tolerates extreme high CO₂ concentrations, but the increasing CO₂ concentrations have a beneficial effect on the molecular structure and function of its photosynthetic mechanism and consequently on the increase of biomass. Therefore, it is a system with perspectives for future biotechnological and environmental applications.

Language

Greek, English

Subject

Biofuels

Biomass

CO2 capture

CO2 stress

Chlorophyll fluoresence

Greenhouse effect

Light stress

OJIP test

Photosynthesis