Potential Outdoor Cultivation of Green Microalgae Based on Response to Changing Temperatures and by Combining with Air Temperature Occurrence
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In this study, our working hypothesis was to examine whether temperature alters biomass and metabolite production by microalgae according to strain. We also addressed whether it is possible to choose a strain suitable for growing in each season of a given region. A factorial experiment revealed a significant interaction between chlorophylls a and b (Chl a and Chl b), carotenoid/Chl (a + b) ratio, biomass and total lipid productivity of six green microalgae (four Chlorella spp., Chlorella sorokiniana and Neochloris oleoabundans) after 15 days at four temperatures. At 39/35 °C, two Chlorella sp. strains (IPR7115 and IPR7117) showed higher total carotenoids/Chl (a + b) (0.578 and 0.830), respectively. N. oleoabundans had the highest Chl a (8210 μg L−1) and Chl b (1909 μg L−1) at 19/15 °C and highest maximum dry biomass (2900 mg L−1), specific growth rate (0.538 day−1) and total lipids (1003 mg L−1) at 15/8 °C. We applied a method to infer the growth of these six green microalgae in outdoor ponds, as based on their response to changing temperatures and by combining with historical data on day/night air temperature occurrence for a given region. We conclude that the use of regionalized maps based on air temperature is a good strategy for predicting microalgal cultivation in outdoor ponds based on their features and tolerance to changing temperature.
KeywordsBiomass Chlorophylls Carotenoids Total lipids Chlorella sorokiniana Neochloris oleoabundans
L. A. Maroubo acknowledges MSc. scholarship from the National Council for the Improvement of Higher Education (CAPES). D.S. Andrade is also a research fellow of CNPq (312996/2017-9).
DSA, LAM and JHC did the conception and design of the study. LAM, GTN, JHC and GML performed acquisition of data. Analysis and interpretation of the data were done by all authors. All authors have reviewed and approved the manuscript for publication.
The study was partially supported by Conselho Nacional de Desenvolvimento Científico (CNPq) project (407297/2013-8).
Compliance with Ethical Standards
Conflict of Interest
The authors declare no conflict of interest. Mention of trade names or commercial products in this paper is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the authors.
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