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 431206
Title Effects of far-red light on fluorescence induction in infiltrated pea leaves under diminished ¿pH and ¿f components of the proton motive force
Author(s) Bulychev, A.A.; Osipov, V.A.; Matorin, D.N.; Vredenberg, W.J.
Source Journal of Bioenergetics and Biomembranes 45 (2013)1-2. - ISSN 0145-479X - p. 37 - 45.
Department(s) Laboratory of Plant Physiology
Publication type Refereed Article in a scientific journal
Publication year 2013
Keyword(s) photoprotective energy-dissipation - electron-transport - chlorophyll fluorescence - delayed fluorescence - photosystem-i - photosynthetic control - charge separation - chloroplasts - kinetics - activation
Abstract Chlorophyll fluorescence induction curves induced by an actinic pulse of red light follow different kinetics in dark-adapted plant leaves and leaves preilluminated with far-red light. This influence of far-red light was abolished in leaves infiltrated with valinomycin known to eliminate the electrical (¿f) component of the proton-motive force and was strongly enhanced in leaves infiltrated with nigericin that abolishes the ¿pH component. The supposed influence of ionophores on different components of the proton motive force was supported by differential effects of these ionophores on the induction curves of the millisecond component of chlorophyll delayed fluorescence. Comparison of fluorescence induction curves with the kinetics of P700 oxidation in the absence and presence of ionophores suggests that valinomycin facilitates a build-up of a rate-limiting step for electron transport at the site of plastoquinone oxidation, whereas nigericin effectively removes limitations at this site. Far-red light was found to be a particularly effective modulator of electron flows in chloroplasts in the absence of ¿pH backpressure on operation of the electron-transport chain.
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