Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 347496
Title Mathematical review of literature to assess alternative electron transports and interphotosystem excitation partitioning of steady-state C3 photosynthesis under limiting light
Author(s) Yin, X.; Harbinson, J.; Struik, P.C.
Source Plant, Cell & Environment 29 (2006)9. - ISSN 0140-7791 - p. 1771 - 1782.
Department(s) Crop and Weed Ecology
Horticultural Supply Chains
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) restricted energy-transfer - radical-pair equilibrium - water-water cycle - chlorophyll fluorescence - photosystem-ii - quantum yield - carbon assimilation - quenching analysis - biochemical-model - co2 assimilation
Abstract Linear whole-chain electron (e) transport plays a dominant role in generating NADPH and ATP required for carbon fixation in chloroplasts. However, other e pathways may be present to contribute to the flexibility of e transport in meeting demands by various downstream metabolic processes. The estimation of the fluxes of these alternative pathways in vivo is difficult, as they are not amenable to direct experimental measurement. A recently developed model based on the generalized stoichiometry for the chloroplast e transport pathways makes it possible to indirectly but quantitatively assess the fractions of e that follow the alternative pathways. This model approach is used to review data from the literature on concurrent measurements of gas exchange and chlorophyll (Chl) fluorescence under steady-state, limiting light, non-photorespiratory conditions. The review suggests possible in vivo occurrence of cyclic e transport (CET) under such conditions. About 10% of e from the reduced ferredoxin follow the pseudocyclic mode, notably in support of nitrate reduction. The estimated fraction of e from the reduced plastoquinone that follows the Q-cycle ( fQ) depends on the number of protons required per ATP synthesis. Our model approach also allows the excitation partitioning to photosystem II (PSII) to be assessed quantitatively. Most important, the model helps assess the limit value to uncertain physiological parameters and answer the 'what-if' question with regard to the effect of non-measured processes or measurement uncertainties on the estimations of alternative e transports.
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