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• W3153406276 abstract "Abstract When C 4 leaves are exposed to low light, CO 2 concentration in the bundle sheath (BS) cells decreases, causing an increase in photorespiration relative to assimilation, and a consequent reduction in biochemical efficiency. These effects can be mitigated by complex acclimation syndromes, which are of primary importance for crop productivity, but not well studied. We unveil an acclimation strategy involving regulation of electron transport processes. Firstly, we characterise anatomy, gas-exchange and electron transport of C 4 Setaria viridis grown under low light. Through a purposely developed biochemical model, we resolve the photon fluxes and reaction rates to explain how the concerted acclimation strategies sustain photosynthetic efficiency. Our results show that a smaller BS in low light-grown plants limited leakiness (the ratio of CO 2 leak rate out of the BS over the rate of supply via C 4 acid decarboxylation) but sacrificed light harvesting and ATP production. To counter ATP shortage and maintain high assimilation rates, plants facilitated light penetration through the mesophyll and upregulated cyclic electron flow in the BS. This shade tolerance mechanism based on optimisation of light reactions is potentially more efficient than the known mechanisms involving the rearrangement of carbon metabolism, and can potentially lead to innovative strategies for crop improvement. Significance We mechanistically link the optical cross-section of leaf compartments with the rate of electron transport, the engagement of cyclic electron flow, the relative rate of ATP and NADPH generation, and fluxes through the carbon metabolism. The striking capacity of Setaria viridis to counter the decrease in light absorption in the bundle sheath with an increase of cyclic electron flow presents perhaps the most efficient mechanism of shade acclimation." @default.
• W3153406276 created "2021-04-26" @default.
• W3153406276 creator A5064471976 @default.
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• W3153406276 date "2021-04-11" @default.
• W3153406276 modified "2023-09-25" @default.
• W3153406276 title "Reduction of bundle sheath size boosts cyclic electron flow in C₄<i>Setaria viridis</i> acclimated to low light" @default.
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• W3153406276 doi "https://doi.org/10.1101/2021.04.11.439306" @default.
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