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

Björn, Lars Olof LU (1995) In Photosynthesis Research 46(1-2). p.203-206
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Photosynthesis Research
volume
46
issue
1-2
pages
203 - 206
publisher
Springer
external identifiers
  • scopus:34249755198
ISSN
0166-8595
language
English
LU publication?
yes
id
41c922d8-1462-4c1c-b910-aa2e95f915b2 (old id 134489)
date added to LUP
2007-07-30 14:27:01
date last changed
2017-01-01 06:44:48
@article{41c922d8-1462-4c1c-b910-aa2e95f915b2,
  abstract     = {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.},
  author       = {Björn, Lars Olof},
  issn         = {0166-8595},
  language     = {eng},
  number       = {1-2},
  pages        = {203--206},
  publisher    = {Springer},
  series       = {Photosynthesis Research},
  title        = {Effect of back reactions in the S-cycle on photosynthesis in very weak light},
  volume       = {46},
  year         = {1995},
}