Carbon-Concentrating Mechanism of Microalgae

Singh, Shailendra Kumar; Sundaram, Shanthy; Kishor, Kaushal

doi:10.1007/978-3-319-09123-5_4

Cited by 2 publications

(1 citation statement)

References 79 publications

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“…CCM is an inducible, energy-dependent, light-regulated process that operates by transporting inorganic carbon (CO 2 or HCO 3 -) from the external environment to the inside of the cell or converting inorganic carbon to organic carbon (C 4 acids). This mechanism enables a high concentration of CO 2 near the active centers of RuBisCO, thereby improving the efficiency of the C 3 photosynthetic pathway and suppressing photorespiration (Singh et al, 2014). Cyanobacteria and other eukaryotic microalgae exhibit different structural features in their CCM, with cyanobacteria possessing a unique structural feature known as carboxysomes.…”

Section: Photosynthesis In Microalgaementioning

confidence: 99%

Emerging technologies for advancing microalgal photosynthesis and metabolism toward sustainable production

Hu,

Meng,

et al. 2023

Front. Mar. Sci.

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Microalgae are unicellular photosynthetic microorganisms that play a vital role in primary production and have diverse applications in various industries. They have high photosynthetic and metabolic capacities and can produce a variety of valuable metabolites, such as lipids, carbohydrates, pigments, and proteins. However, practical applications of microalgae are limited to high-value products due to the high production costs. Algal biotechnology faces challenges such as low energy utilization efficiency and product yield that are currently inadequate to fulfill commercial production. To overcome these challenges, emerging technologies have shown promise to achieve higher production efficiency, including molecular manipulation of photosynthetic efficiency and metabolic activities. Here, we provided an overview of the importance, diversity, and photosynthesis of microalgae, as well as strategies for enhancing their photosynthetic efficiency. We discussed various approaches for improving microalgal photosynthesis, including strain selection and optimization, rational genetic modification, and innovative technologies such as spectral recomposition of light, nanomaterials, advanced cultivation systems, and symbiotic systems. Additionally, we summarized metabolic engineering strategies that focus on optimizing the synthesis of value-added metabolites, such as pigments, long-chain polyunsaturated fatty acids, starch, proteins, and hydrogen in microalgae. By concentrating on improving photosynthetic efficiency and the synthesis of bioactive metabolites, this review provided valuable insights into enhancing microalgae production yields. Overcoming limitations in microalgae production costs can lead to broader applications in various industries. Furthermore, we highlight the potential of these strategies in increasing the efficiency of microalgae as a sustainable source for high-value products.

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Section: Photosynthesis In Microalgaementioning

confidence: 99%

Emerging technologies for advancing microalgal photosynthesis and metabolism toward sustainable production

Hu,

Meng,

et al. 2023

Front. Mar. Sci.

View full text Add to dashboard Cite

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Impacts of CO2 concentration on growth, lipid accumulation, and carbon-concentrating-mechanism-related gene expression in oleaginous Chlorella

Fan

Luo

et al. 2015

Appl Microbiol Biotechnol

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Biodiesel production by microalgae with photosynthetic CO2 biofixation is thought to be a feasible way in the field of bioenergy and carbon emission reduction. Knowledge of the carbon-concentrating mechanism plays an important role in improving microalgae carbon fixation efficiency. However, little information is available regarding the dramatic changes of cells suffered upon different environmental factors, such as CO2 concentration. The aim of this study was to investigate the growth, lipid accumulation, carbon fixation rate, and carbon metabolism gene expression under different CO2 concentrations in oleaginous Chlorella. It was found that Chlorella pyrenoidosa grew well under CO2 concentrations ranging from 1 to 20 %. The highest biomass and lipid productivity were 4.3 g/L and 107 mg/L/day under 5 % CO2 condition. Switch from high (5 %) to low (0.03 %, air) CO2 concentration showed significant inhibitory effect on growth and CO2 fixation rate. The amount of the saturated fatty acids was increased obviously along with the transition. Low CO2 concentration (0.03 %) was suitable for the accumulation of saturated fatty acids. Reducing the CO2 concentration could significantly decrease the polyunsaturated degree in fatty acids. Moreover, the carbon-concentrating mechanism-related gene expression revealed that most of them, especially CAH2, LCIB, and HLA3, had remarkable change after 1, 4, and 24 h of the transition, which suggests that Chlorella has similar carbon-concentrating mechanism with Chlamydomonas reinhardtii. The findings of the present study revealed that C. pyrenoidosa is an ideal candidate for mitigating CO2 and biodiesel production and is appropriate as a model for mechanism research of carbon sequestration.

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Carbon-Concentrating Mechanism of Microalgae

Cited by 2 publications

References 79 publications

Emerging technologies for advancing microalgal photosynthesis and metabolism toward sustainable production

Emerging technologies for advancing microalgal photosynthesis and metabolism toward sustainable production

Impacts of CO2 concentration on growth, lipid accumulation, and carbon-concentrating-mechanism-related gene expression in oleaginous Chlorella

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