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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

12 Issues per year


IMPACT FACTOR 2016: 0.631

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1865-7117
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Volume 26, Issue 11 (Nov 1971)

Issues

On the Reaction between Chlorophyll-a, and its Primary Electron Donors in Photosynthesis

W. Haehnel
  • Max-Volmer-Institut, I. Institut für Physikalische Chemie der Technischen Universität Berlin
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/ G. Döring
  • Max-Volmer-Institut, I. Institut für Physikalische Chemie der Technischen Universität Berlin
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/ H. T. Witt
  • Max-Volmer-Institut, I. Institut für Physikalische Chemie der Technischen Universität Berlin
  • Other articles by this author:
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Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/znb-1971-1118

Electrons produced by Chl-aII in a short flash are finally transfered to Chl-ai after having passed several intermediates. The reaction between Chl-aI and its primary electron donators PD (probably Cyt-f and PC) has been studied by means of high time resolution flash photometry in isolated spinach chloroplasts with the following results:

1. When PD are in the oxidized state, the reduction of Chl-aI takes place with the rate limiting reaction time of the electron transport chain (≈ 20 ms).

2. When PD are in the reduced state, the reduction of Chl-aI takes place with the reaction times between the PD and Chl-ai. We found two half life times: one of about 200 μs and one of about 10 μs.

The reduced state of PD is realized when weak monitoring light or hvII-preillumination is used.

The two reaction times of ≈ 200 μs and of ≈ 10 µs are interpreted to represent the electron transfers between Cyt-f and Chl-aI and between PC and Chl-aI resp.

Equilibrium constants of the electron transfer from PD to Chl-aI and the arrangement of the intermediates in the electron transport chain are discussed.

About the article

Received: 1971-04-04

Published Online: 2014-06-02

Published in Print: 1971-11-01


Citation Information: Zeitschrift für Naturforschung B, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-1971-1118.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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