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Effect of back reactions in the S-cycle on photosynthesis in very weak light

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Author

Summary, in English

Photosynthesis in light which is so weak that excitation rates are comparable to the decay rates of S-states is modelled. It is found that oxygen evolution rate varies in a non-linear way with Photosystem II excitation rate in this region, but asymptotically approaches a linear relationship (with a slope of one oxygen molecule per four excitations) as excitation rate increases. The asymptote gives an intercept (zero oxygen evolution rate) on the excitation rate axis. The question is raised, whether this model is compatible with photoautotrophy in a red alga found at 268 m depth and able to carry out photosynthesis in extremely weak light. It is found that no unorthodox mechanisms for the S-cycle in this alga have to be assumed to explain its performance.

Publishing year

1995

Language

English

Pages

203-206

Publication/Series

Photosynthesis Research

Volume

46

Issue

1-2

Document type

Journal article

Publisher

Springer

Topic

  • Biological Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 0166-8595