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 559903
Title The kinetics of P‐700+ reduction in leaves : a novel in situ probe of thylakoid functioning
Author(s) Harbinson, J.; Hedley, C.L.
Source Plant, Cell & Environment 12 (1989)4. - ISSN 0140-7791 - p. 357 - 369.
DOI https://doi.org/10.1111/j.1365-3040.1989.tb01952.x
Publication type Refereed Article in a scientific journal
Publication year 1989
Keyword(s) electron transport - irradiance response - PSI - P‐700 - quantum efficiency
Abstract

Abstract. The half time (t1/2) of the reduction of P‐700+ in the millisecond time frame is known to be limited by the reaction between plastoquinol and the cytochrome cytb6f complex. This is considered to be the rate limiting reaction of thylakoid electron transport and measurements of it provide a means of analysing how thylakoid election transport is regulated in vivo. The half time for the reduction of photochemically oxidized P‐700 has been measured in vivo using absorbance changes around 820 nm. The results showed that t1/2 is independent of irradiance and decreases as photosynthetic induction progresses. Even with a constant t1/2 the quantum efficiency of PSI declined as irradiance increased. The significance of the concept of photosynthetic control of electron transport is discussed in the light of these observations.

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