Influence of electrochemical proton gradient on electron flow in photosystem I of pea leaves

Influence of electrochemical proton gradient on electron flow in photosystem I of pea leaves Photoinduced changes in the redox state of photosystem I (PSI) primary donor, chlorophyll P700 were studied by measuring differential absorbance changes of pea leaves at 810 nm minus 870 nm (ΔA 810). The kinetics of ΔA 810 induced by 5-s pulses of white light were strongly affected by preillumination. In dark-adapted leaves, the light pulse caused a transient oxidation of P700 and its subsequent reduction. An identical pulse, applied after 30-s preillumination with white light, induced sequential appearance of two peaks of P700 oxidation. These kinetic differences of ΔA 810 reflect regulatory changes of electron flow on the donor and acceptor sides of PSI induced by illumination of leaf for 20–40 s. The amplitude of ΔA 810 second peak depended nonmonotonically on the dark interval preceding illumination: it increased with the length of dark period in the range 3–10 s and decreased upon longer dark intervals. The second wave of ΔA 810 disappeared after the treatment with combination of ionophores preventing ΔpH and electric potential formation at the thylakoid membrane. In leaves treated with monensin eliminating ΔpH only, the ΔA 810 signals become incompletely reversible and were characterized by slow relaxation in darkness. The results indicate an important role of electrochemical proton gradient in generation of the second wave of light-induced P700 oxidation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Influence of electrochemical proton gradient on electron flow in photosystem I of pea leaves

Loading next page...
 
/lp/springer_journal/influence-of-electrochemical-proton-gradient-on-electron-flow-in-JNPX9zMAQ0
Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2008 by MAIK Nauka
Subject
Life Sciences; Plant Sciences ; Plant Physiology
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443708040018
Publisher site
See Article on Publisher Site

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • No expiration
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches

$49/month

Start Free Trial

14-day Free Trial

Best Deal — 39% off

Annual Plan

  • All the features of the Professional Plan, but for 39% off!
  • Billed annually
  • No expiration
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.

$588

$360/year

billed annually
Start Free Trial

14-day Free Trial