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CO2 fixation by microalgae Chlorophyceae: photosynthesis and biochemical composition under different CO2 concentrations


Climate change and increased levels of CO2 and other greenhouse gases in the atmosphere became important environmental issues in recent years. Specific CO2 emissions as processes of energy generation and cement production are contributors of this increase. Biological CO2 mitigation by microalgae is a potentially viable option to reduce atmospheric levels of this gas, since these microorganisms present high growth rates, exhibit high rates of carbon fixation, and in many cases, are able to withstand severe conditions imposed by industrial wastes. Microalgae have biotechnological attributes such as physiological plasticity, which result in ability to adjust their metabolism to increased concentration of CO2. The survival of microalgae for increasing CO2 concentrations can be stimulated by induction using a metabolic acclimation process. This investigation is a contribution to the study of photosynthesis in conditions of altered CO2 and its importance is related to the increased levels of atmospheric CO2 that are predicted for a short future. We expect to obtain results that will help clarify the potentials and limitations of microalgae in the process of CO2 remediation, as well as what effects this may cause in the biomass both in qualitative and quantitative terms. We complement that microalgae are organisms base of food chains in aquatic environments and any factor that affects its dynamics can unbalance these ecosystems. This project aims to quantify the CO2 fixation by two microalgae Chlorophyceae using the techniques of photosynthetic efficiency through modulated fluorescence ( PhytoPAM ) and the 14C method, well known for its application in the determination of primary production. Through modulated fluorescence we will quantify the quantum yield of photosystem II, the rate of electron transport, and based on this information, the carbon fixation. The cultures will be monitored for chlorophyll a concentration, elemental composition (CHNS), growth rate and biochemical composition of the biomass. The study will focus on laboratory scale experiments (up to 1000 mL) with both species, and 200 L cultures with one Chlorophyceae that will be defined based on the results obtained in laboratory. We expect that the results contribute significantly to applications of microalgae in the remediation of CO2. Moreover, it is expected to provide support for the chlorophyll fluorescence base methodology (simple and noninvasive) for the quantitation of carbon fixation by microalgae. (AU)

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Scientific publications (7)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MARCHELLO, ADRIANO EVANDIR; OLIVEIRA, NATALIA LOMBARDI; LOMBARDI, ANA TERESA; POLPO, ADRIANO. An investigation onto Cd toxicity to freshwater microalga Chlorella sorokiniana in mixotrophy and photoautotrophy: A Bayesian approach. Chemosphere, v. 211, p. 794-803, NOV 2018. Web of Science Citations: 2.
SILVA, JAQUELINE CARMO; ECHEVESTE, PEDRO; TERESA LOMBARDI, ANA. Higher biomolecules yield in phytoplankton under copper exposure. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, v. 161, p. 57-63, OCT 15 2018. Web of Science Citations: 4.
MARCHELLO, ADRIANO EVANDIR; DOS SANTOS, ALEXSANDRO CLAUDINO; LOMBARDI, ANA TERESA; OLIVEIRA DE SOUZA, CLOVIS WESLEY; MONTANHIM, GRAZIELA CRISTINA. Physiological and Ecological Aspects of Chlorella sorokiniana (Trebouxiophyceae) Under Photoautotrophic and Mixotrophic Conditions. MICROBIAL ECOLOGY, v. 76, n. 3, p. 791-800, OCT 2018. Web of Science Citations: 1.
ROSSI, RAQUEL ANDRADE; CAMARGO, EDUARDO CAFFAGNI; GARCIA MANOEL CRNKOVIC, PAULA CRISTINA; LOMBARDI, ANA TERESA. Physiological and Biochemical Responses of Chlorella vulgaris to Real Cement Flue Gas Under Controlled Conditions. WATER AIR AND SOIL POLLUTION, v. 229, n. 8 AUG 2018. Web of Science Citations: 1.
MARCHELLO, ADRIANO EVANDIR; BARRETO, DANIELA MARIANO; LOMBARDI, ANA TERESA. Effects of Titanium Dioxide Nanoparticles in Different Metabolic Pathways in the Freshwater Microalga Chlorella sorokiniana (Trebouxiophyceae). WATER AIR AND SOIL POLLUTION, v. 229, n. 2 FEB 2018. Web of Science Citations: 5.
CHIA, MATHIAS AHII; LOMBARDI, ANA TERESA; MELAO, MARIA DA GRACA G.; PARRISH, CHRISTOPHER C. Phosphorus levels determine changes in growth and biochemical composition of Chlorella vulgaris during cadmium stress. JOURNAL OF APPLIED PHYCOLOGY, v. 29, n. 4, p. 1883-1891, AUG 2017. Web of Science Citations: 5.
CANDIDO, CAMILA; LOMBARDI, ANA TERESA. Growth of Chlorella vulgaris in treated conventional and biodigested vinasses. JOURNAL OF APPLIED PHYCOLOGY, v. 29, n. 1, p. 45-53, FEB 2017. Web of Science Citations: 6.

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