Photomorphogenesis in the Cyanobacterium Fremyella diplosiphon Improves Photosynthetic Efficiency

Kumar, Vinod; Maurya, Pankaj Kumar; Mondal, Soumila; Sinha, Rajeshwar P.; Singh, Shailendra P.

doi:10.1016/b978-0-12-814667-5.00006-4

Cited by 7 publications

(4 citation statements)

References 73 publications

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“…aeruginosa was grown under NH 4 + -N-only, the expression of the petH gene (coding FNR) was largely downregulated ( p < 0.05), while the expression of the petF gene (coding Fd) was upregulated and it was almost 2.5 times as high as that of NO 3 – -N-only on day 7. The percentage of the absorbed protons transferred to RCs for a high degree of oxygen reduction in cyanobacteria is close to 50%, which is much higher than 15% in higher plants . Therefore, electrons accumulation in photosynthetic organisms commonly occurs, particularly when the rate of electron transport outstrips that of electron consumption during photosynthetic carbon fixation, which can cause a CEF enhancement in thylakoid dissipating excess electron energy to alleviate the PSII photodamage.…”

Section: Resultsmentioning

confidence: 99%

“…The percentage of the absorbed protons transferred to RCs for a high degree of oxygen reduction in cyanobacteria is close to 50%, which is much higher than 15% in higher plants. 52 Therefore, electrons accumulation in photosynthetic organisms commonly occurs, particularly when the rate of electron transport outstrips that of electron consumption during photosynthetic carbon fixation, 49 which can cause a CEF enhancement in thylakoid dissipating excess electron energy to alleviate the PSII photodamage. In the CEF, Fd generally transfers the electrons to NDH rather than FNR.…”

Section: Effects Of Different N Forms On the Oxidative Stressmentioning

confidence: 99%

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Uncovering the Differential Growth of Microcystis aeruginosa Cultivated under Nitrate and Ammonium from a Photophysiological Perspective

Yang

Dong

Liu³

et al. 2023

ACS EST Water

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Cyanobacteria have a relatively high affinity for NH4 +, yet a NO3 –-rich environment is comparatively conducive to their proliferation. To date, little information is available on why NO3 –-N favors cyanobacterial biomass accumulation. This study investigated the dependence of biomass, nitrogen assimilation characteristics, and photophysiological performance of Microcystis aeruginosa on the forms of nitrogen supply, including NO3 –-N-only, NH4 +-N-only, and NO3 –-N + NH4 +-N. The results indicated that despite the retarded growth of M. aeruginosa, cells supplied with NO3 –-N-only maintained a simultaneous promotion in the growth rate, nitrogen assimilation efficiency, and photosynthetic capacity, resulting in high biomass production. Cells supplied with NH4 +-N-only and NO3 –-N + NH4 +-N were able to rapidly assimilate nitrogen during initial cell proliferation, showing a preferential use of NH4 +-N and the inhibition of NO3 – uptake by NH4 +. However, growth repression occurred as cultivation time was prolonged when NH4 +-N was excessively supplied, mainly due to PSII photodamage, intracellular redox imbalance, and increased electron energy accumulation. Thus, cells supplied with NH4 +-N-only had to reduce light energy capture, increase photoprotection, and consume excess electrons to mitigate the damage. These findings are critical for improving our understanding of the role of different nitrogen forms in the regulation of cyanobacterial photophysiological performance and growth.

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Section: Resultsmentioning

confidence: 99%

Section: Effects Of Different N Forms On the Oxidative Stressmentioning

confidence: 99%

Uncovering the Differential Growth of Microcystis aeruginosa Cultivated under Nitrate and Ammonium from a Photophysiological Perspective

Yang

Dong

Liu³

et al. 2023

ACS EST Water

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“…It has attracted attention because of its exceptional chromatic acclimation capabilities. In this process, F. diplosiphon changes its pigment composition to maximally absorb the available photons of light to support photosynthesis [ 69 ]. It is equipped with one of the most intricate light-sensing systems composed of 27 different phytochrome superfamily members for light color sensing [ 70 ].…”

Section: Model Organisms and Emerging Speciesmentioning

confidence: 99%

Current Metabolic Engineering Strategies for Photosynthetic Bioproduction in Cyanobacteria

2023

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Cyanobacteria are photosynthetic microorganisms capable of using solar energy to convert CO2 and H2O into O2 and energy-rich organic compounds, thus enabling sustainable production of a wide range of bio-products. More and more strains of cyanobacteria are identified that show great promise as cell platforms for the generation of bioproducts. However, strain development is still required to optimize their biosynthesis and increase titers for industrial applications. This review describes the most well-known, newest and most promising strains available to the community and gives an overview of current cyanobacterial biotechnology and the latest innovative strategies used for engineering cyanobacteria. We summarize advanced synthetic biology tools for modulating gene expression and their use in metabolic pathway engineering to increase the production of value-added compounds, such as terpenoids, fatty acids and sugars, to provide a go-to source for scientists starting research in cyanobacterial metabolic engineering.

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“…It has attracted attention because of its exceptional chromatic acclimation capabilities. In this process, F. diplosiphon changes its pigment composition to maximally absorb the available photons of light to support photosynthesis [67]. It is equipped with one of the most intricate light-sensing systems composed of 27 different phytochrome superfamily members for light color sensing [68].…”

Section: Synechococcus Elongatus Sp Pcc 7942 (Syn7942) (Former Anacys...mentioning

confidence: 99%

Current Metabolic Engineering Strategies for Photosynthetic Bioproduction in Cyanobacteria

Satta¹,

Esquirol²,

Ebert³

2022

Preprint

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Cyanobacteria are photosynthetic microorganisms capable of using solar energy to convert CO2 and H2O into O2 and energy-rich organic compounds, thus enabling sustainable production of a wide range of bio-products. More and more strains of cyanobacteria are identified that show great promise as cell platforms for the generation of bioproducts. However, strain development is still required to optimize their biosynthesis and increase titers for industrial applications. This review describes the most well-known and newest most promising strains available to the community and gives an overview of current cyanobacterial biotechnology and the latest innovative strategies used for engineering cyanobacteria. We summarize advanced synthetic biology tools for modulating gene expression and their use in metabolic pathway engineering to increase the production of value-added compounds, such as terpenoids, fatty acids, and sugars, to provide a go-to source for scientists starting research in cyanobacterial metabolic engineering.

show abstract

Photomorphogenesis in the Cyanobacterium Fremyella diplosiphon Improves Photosynthetic Efficiency

Cited by 7 publications

References 73 publications

Uncovering the Differential Growth of Microcystis aeruginosa Cultivated under Nitrate and Ammonium from a Photophysiological Perspective

Uncovering the Differential Growth of Microcystis aeruginosa Cultivated under Nitrate and Ammonium from a Photophysiological Perspective

Current Metabolic Engineering Strategies for Photosynthetic Bioproduction in Cyanobacteria

Current Metabolic Engineering Strategies for Photosynthetic Bioproduction in Cyanobacteria

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