CO[sub.2] Levels Modulate Carbon Utilization, Energy Levels and Inositol Polyphosphate Profile in IChlorella/I

Microalgae have a growing recognition of generating biomass and capturing carbon in the form of CO[sub.2] . The genus Chlorella has especially attracted scientists’ attention due to its versatility in algal mass cultivation systems and its potential in mitigating CO[sub.2] . However, some aspects of...

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Bibliographic Details
Published in:Plants (Basel) 2022-12, Vol.12 (1)
Main Authors: Morales-Pineda, María, García-Gómez, Maria Elena, Bedera-García, Rodrigo, García-González, Mercedes, Couso, Inmaculada
Format: Article
Language:English
Subjects:
Analysis
Biomass energy
Carbon dioxide
Chlorella
Growth
Influence
Inositol
Photosynthesis
Physiological aspects
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Summary:Microalgae have a growing recognition of generating biomass and capturing carbon in the form of CO[sub.2] . The genus Chlorella has especially attracted scientists’ attention due to its versatility in algal mass cultivation systems and its potential in mitigating CO[sub.2] . However, some aspects of how these green microorganisms respond to increasing concentrations of CO[sub.2] remain unclear. In this work, we analyzed Chlorella sorokiniana and Chlorella vulgaris cells under low and high CO[sub.2] levels. We monitored different processes related to carbon flux from photosynthetic capacity to carbon sinks. Our data indicate that high concentration of CO[sub.2] favors growth and photosynthetic capacity of the two Chlorella strains. Different metabolites related to the tricarboxylic acid cycle and ATP levels also increased under high CO[sub.2] concentrations in Chlorella sorokiniana, reaching up to two-fold compared to low CO[sub.2] conditions. The signaling molecules, inositol polyphosphates, that regulate photosynthetic capacity in green microalgae were also affected by the CO[sub.2] levels, showing a deep profile modification of the inositol polyphosphates that over-accumulated by up to 50% in high CO[sub.2] versus low CO[sub.2] conditions. InsP[sub.4] and InsP[sub.6] increased 3- and 0.8-fold, respectively, in Chlorella sorokiniana after being subjected to 5% CO[sub.2] condition. These data indicate that the availability of CO[sub.2] could control carbon flux from photosynthesis to carbon storage and impact cell signaling integration and energy levels in these green cells. The presented results support the importance of further investigating the connections between carbon assimilation and cell signaling by polyphosphate inositols in microalgae to optimize their biotechnological applications.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants12010129