The relationship between P-680 and C-550.

Abstract:

:The published reports of flash-induced absorbance changes in the 680-690 nm spectral region, which have been attributed to bleaching of the primary reaction center chlorophyll of photosystem II (PSII) P-680, are discussed in light of what is known about the primary electron acceptor of PSII, C-550. The question of whether the fluorescence yield changes, which accompany the photoreduction of C-550, might influence the measurements of chlorophyll bleaching is examined. The responses attributed to P-680 and their relationship to C-550 indicate that, if the absorbance measurements are valid, P-680 probably functions as the primary electron donor to PSII rather than as a photochemical sensitizer of the primary redox reaction.

journal_name

Biophys J

journal_title

Biophysical journal

authors

Butler WL

doi

10.1016/S0006-3495(72)86128-9

subject

Has Abstract

pub_date

1972-07-01 00:00:00

pages

851-7

issue

7

eissn

0006-3495

issn

1542-0086

pii

S0006-3495(72)86128-9

journal_volume

12

pub_type

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