Extra O2 evolution reveals an O2-independent alternative electron sink in photosynthesis of marine diatoms

Shimakawa, Ginga; Matsuda, Yusuke

doi:10.1007/s11120-023-01073-3

Photosynth Res

2024

DOI: 10.1007/s11120-023-01073-3

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Extra O2 evolution reveals an O2-independent alternative electron sink in photosynthesis of marine diatoms

Ginga Shimakawa,

Yusuke Matsuda

Abstract: Funding information: This work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI (19H01153 to G.S. and Y.M.) and by JST CREST "Cell dynamics" (JPMJCR20E1 to Y.M.).

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Comparative transcriptome and metabolomic analysis reveal key genes and mechanisms responsible for the dark-green leaf color of a strawberry mutant

Peng,

Jiang,

Chen

et al. 2025

Plant Physiology and Biochemistry

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Comparative transcriptome and metabolomic analysis reveal key genes and mechanisms responsible for the dark-green leaf color of a strawberry mutant

Peng,

Jiang,

Chen

et al. 2025

Plant Physiology and Biochemistry

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Alternative electron pathways of photosynthesis power green algal CO2 capture

Peltier,

Stoffel,

Findinier

et al. 2024

The Plant Cell

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Microalgae contribute to about half of global net photosynthesis, which converts sunlight into the chemical energy (ATP and NADPH) used to transform CO2 into biomass. Alternative electron pathways of photosynthesis have been proposed to generate additional ATP that is required to sustain CO2 fixation. However, the relative importance of each alternative pathway remains elusive. Here, we dissect and quantify the contribution of cyclic, pseudo-cyclic and chloroplast-to-mitochondria electron flows for their ability to sustain net photosynthesis in the microalga Chlamydomonas reinhardtii. We show that (i) each alternative pathway can provide sufficient additional energy to sustain high CO2 fixation rates, (ii) the alternative pathways exhibit cross-compensation, and (iii) the activity of at least one of the three alternative pathways is necessary to sustain photosynthesis. We further show that all pathways have very different efficiencies at energizing CO2 fixation, with the chloroplast–mitochondria interaction being the most efficient. Overall, our data lay bioenergetic foundations for biotechnological strategies to improve CO2 capture and fixation.

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Extra O2 evolution reveals an O2-independent alternative electron sink in photosynthesis of marine diatoms

Abstract: Funding information: This work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI (19H01153 to G.S. and Y.M.) and by JST CREST "Cell dynamics" (JPMJCR20E1 to Y.M.).

Cited by 2 publications

References 50 publications

Comparative transcriptome and metabolomic analysis reveal key genes and mechanisms responsible for the dark-green leaf color of a strawberry mutant

Comparative transcriptome and metabolomic analysis reveal key genes and mechanisms responsible for the dark-green leaf color of a strawberry mutant

Alternative electron pathways of photosynthesis power green algal CO2 capture

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