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 430846
Title Photosynthetic Quantum Yield Dynamics: From Photosystems to Leaves
Author(s) Hogewoning, S.W.; Wientjes, E.; Douwstra, P.; Trouwborst, G.; Ieperen, W. van; Croce, R.; Harbinson, J.
Source The Plant Cell 24 (2012)5. - ISSN 1040-4651 - p. 1921 - 1935.
Department(s) Horticultural Supply Chains
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) chlorophyll-protein complexes - singlet energy-transfer - plastid redox signals - arabidopsis-thaliana - light environment - state transitions - action spectrum - leaf photosynthesis - vascular plants - beta-carotene
Abstract The mechanisms underlying the wavelength dependence of the quantum yield for CO2 fixation (a) and its acclimation to the growth-light spectrum are quantitatively addressed, combining in vivo physiological and in vitro molecular methods. Cucumber (Cucumis sativus) was grown under an artificial sunlight spectrum, shade light spectrum, and blue light, and the quantum yield for photosystem I (PSI) and photosystem II (PSII) electron transport and a were simultaneously measured in vivo at 20 different wavelengths. The wavelength dependence of the photosystem excitation balance was calculated from both these in vivo data and in vitro from the photosystem composition and spectroscopic properties. Measuring wavelengths overexciting PSI produced a higher a for leaves grown under the shade light spectrum (i.e., PSI light), whereas wavelengths overexciting PSII produced a higher a for the sun and blue leaves. The shade spectrum produced the lowest PSI:PSII ratio. The photosystem excitation balance calculated from both in vivo and in vitro data was substantially similar and was shown to determine a at those wavelengths where absorption by carotenoids and nonphotosynthetic pigments is insignificant (i.e., >580 nm). We show quantitatively that leaves acclimate their photosystem composition to their growth light spectrum and how this changes the wavelength dependence of the photosystem excitation balance and quantum yield for CO2 fixation. This also proves that combining different wavelengths can enhance quantum yields substantially.
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