PSII Complexes with Destabilized Primary Quinone Acceptor of Electrons in Dark-Adapted Chlorella

PSII Complexes with Destabilized Primary Quinone Acceptor of Electrons in Dark-Adapted Chlorella Incubation of the alga Chlorella pyrenoidosa Chick in darkness (at 37°C) for 24 h did not change the initial (F 0) and maximum (F m) yield of chlorophyll fluorescence in diuron-treated cells. In dark-incubated alga, the contribution of the slow (rise time 10–15 min) phases to the kinetics of F m rise and, correspondingly, to variable fluorescence F v (where F v = F m – F 0) increased twofold. In addition, F m was attained at higher concentrations of diuron, which inhibits electron transfer between the primary (Q A) and secondary (Q B) quinone acceptors of electron in the PSII. Inhibition of photosynthetic electron transfer with o-phenanthroline, which, at high concentrations, competitively replaces both Q B and Q A, decreased F m yield due to selective suppression of the slow phase of fluorescence rise. It was assumed that the slow phase in the kinetics of F m rise reflects the functioning of PSII complexes with destabilized Q A. Such destabilization can result from the modification of the major PSII proteins (D1 and D2) in dark-adapted Chlorella cells. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

PSII Complexes with Destabilized Primary Quinone Acceptor of Electrons in Dark-Adapted Chlorella

Loading next page...
 
/lp/springer_journal/psii-complexes-with-destabilized-primary-quinone-acceptor-of-electrons-yPooJ5N5DR
Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2004 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/B:RUPP.0000011297.46160.e6
Publisher site
See Article on Publisher Site

Abstract

Incubation of the alga Chlorella pyrenoidosa Chick in darkness (at 37°C) for 24 h did not change the initial (F 0) and maximum (F m) yield of chlorophyll fluorescence in diuron-treated cells. In dark-incubated alga, the contribution of the slow (rise time 10–15 min) phases to the kinetics of F m rise and, correspondingly, to variable fluorescence F v (where F v = F m – F 0) increased twofold. In addition, F m was attained at higher concentrations of diuron, which inhibits electron transfer between the primary (Q A) and secondary (Q B) quinone acceptors of electron in the PSII. Inhibition of photosynthetic electron transfer with o-phenanthroline, which, at high concentrations, competitively replaces both Q B and Q A, decreased F m yield due to selective suppression of the slow phase of fluorescence rise. It was assumed that the slow phase in the kinetics of F m rise reflects the functioning of PSII complexes with destabilized Q A. Such destabilization can result from the modification of the major PSII proteins (D1 and D2) in dark-adapted Chlorella cells.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 18, 2004

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 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

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

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off