ArticlePlant physiology2023
Two cyclic electron flows around photosystem I differentially participate in C4 photosynthesis.
Article in Plant physiology, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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13 citing papers in PubMed, 31 citations in OpenAlex.
- Faster relaxation of nonphotochemical quenching in C4 than in C3 species.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Fitting photosynthetic carbon dioxide and irradiance response curves for C4 leaves.Journal of experimental botany · 2026Article
- OsRNase ZPlant communications · 2026Article
- Photosystem I-independent oxygenic photosynthesis in cyanobacteria.Nature communications · 2026Article
- Cyclic electron flow around photosystem I provides energy production and photoprotection in C4 plants.Plant physiology · 2026Article
- Inducibility of cyclic electron transport is linked to the transition from C3-C4 to C4 photosynthesis in Flaveria.Plant physiology · 2026Article
- Growth-stage dependent changes of leaf chlorophyll content as a proxy for photosynthetic capacity in maize.Frontiers in plant science · 2026Article
- Bundle sheath cell-specific expression of chloroplast genes encoding subunits of the NADH dehydrogenase-like complex in maize.The Plant journal : for cell and molecular biology · 2025Article
- Review
- PROTON GRADIENT REGULATION 5 enables efficient C4 photosynthesis under fluctuating light.Plant physiology · 2025Article
- In vivo two-photon FLIM resolves photosynthetic properties of maize bundle sheath cells.Photosynthesis research · 2025Article
- Agrobacterium-mediated transient transformation of Flaveria bidentis leaves: a novel method to examine the evolution of CPlant methods · 2024Article
- A pgr5 suppressor screen uncovers two distinct suppression mechanisms and links cytochrome b6f complex stability to PGR5.The Plant cell · 2024Article
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Authors and funding
7 authors at 3 institutions in 1 country.
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Abstract
C4 plants assimilate CO2 more efficiently than C3 plants because of their C4 cycle that concentrates CO2. However, the C4 cycle requires additional ATP molecules, which may be supplied by cyclic electron flow (CEF) around photosystem I. One CEF route, which depends on a chloroplast NADH dehydrogenase-like (NDH) complex, is suggested to be crucial for C4 plants despite the low activity in C3 plants. The other route depends on proton gradient regulation 5 (PGR5) and PGR5-like photosynthetic phenotype 1 (PGRL1) and is considered a major CEF route to generate the proton gradient across the thylakoid membrane in C3 plants. However, its contribution to C4 photosynthesis is still unclear. In this study, we investigated the contribution of the two CEF routes to the NADP-malic enzyme subtype of C4 photosynthesis in Flaveria bidentis. We observed that suppressing the NDH-dependent route drastically delayed growth and decreased the CO2 assimilation rate to approximately 30% of the wild-type rate. On the other hand, suppressing the PGR5/PGRL1-dependent route did not affect plant growth and resulted in a CO2 assimilation rate that was approximately 80% of the wild-type rate. Our data indicate that the NDH-dependent CEF substantially contributes to the NADP-malic enzyme subtype of C4 photosynthesis and that the PGR5/PGRL1-dependent route cannot complement the NDH-dependent route in F. bidentis. These findings support the fact that during C4 evolution, photosynthetic electron flow may have been optimized to provide the energy required for C4 photosynthesis.
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