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Related Experiment Videos

The relationship between P-680 and C-550.

W L Butler

    Biophysical Journal
    |July 1, 1972
    PubMed
    Summary

    Flash-induced absorbance changes in photosystem II (PSII) are re-examined. Findings suggest P-680 acts as the primary electron donor, not a sensitizer, in PSII primary redox reactions.

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    Area of Science:

    • Photosynthesis research
    • Plant biochemistry
    • Photophysics

    Background:

    • Flash-induced absorbance changes in the 680-690 nm region are linked to photosystem II (PSII) P-680 chlorophyll bleaching.
    • The primary electron acceptor in PSII is known as C-550.

    Purpose of the Study:

    • To re-evaluate reports on flash-induced absorbance changes attributed to P-680 bleaching.
    • To investigate the potential influence of fluorescence yield changes on chlorophyll bleaching measurements.
    • To clarify the functional role of P-680 in PSII primary redox reactions.

    Main Methods:

    • Analysis of published reports on flash-induced absorbance changes.
    • Comparison of P-680 responses with known C-550 photoreduction data.
    • Examination of fluorescence yield changes during C-550 photoreduction.

    Main Results:

    • Absorbance changes attributed to P-680 bleaching are discussed in relation to C-550.
    • The potential impact of fluorescence yield changes on absorbance measurements was considered.
    • Observed responses suggest P-680's role in PSII primary reactions.

    Conclusions:

    • If absorbance measurements are accurate, P-680 likely functions as the primary electron donor in PSII.
    • P-680's role is likely that of a donor, rather than a sensitizer, in the primary redox reaction of PSII.

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