Skip Navigation

This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (12)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Thomas, D. J.
Right arrow Articles by Herbert, S. K.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Thomas, D. J.
Right arrow Articles by Herbert, S. K.
Agricola
Right arrow Articles by Thomas, D. J.
Right arrow Articles by Herbert, S. K.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Plant and Cell Physiology, 2001, Vol. 42, No. 8 803-812
© 2001 Oxford University Press

Photoinhibition and Light-Induced Cyclic Electron Transport in ndhB– and psaE– Mutants of Synechocystis sp. PCC 6803

David J. Thomas1, Jannette Thomas1, Philip A. Youderian2 and Stephen K. Herbert ,3,4

1 Biology and Chemistry Division, Lyon College, P.O. Box 2317, Batesville, AR 72501, U.S.A. 2 Department of Biology, Texas A & M University, College Station, TX 77843-3258, U.S.A. 3 Department of Botany, University of Wyoming, Laramie, WY 82071-3165, U.S.A.

The ndhB– and psaE– mutants of the cyanobacterium Synechocystis sp. PCC 6803 are partly deficient in PSI-driven cyclic electron transport. We compared photoinhibition in these mutants to the wild type to test the hypothesis that PSI cyclic electron transport protects against photoinhibition. Photoinhibitory treatment greatly accelerated PSI cyclic electron transport in the wild type and also in both the mutants. The psaE– mutant showed rates of PSI cyclic electron transport similar to the wild type under all conditions tested. The ndhB– mutant showed much lower rates of PSI cyclic electron transport than the wild type following brief dark adaptation but exceeded wild type rates after exposure to photoinhibitory light. The wild type and both mutants showed similar rates of photoinhibition damage and photoinhibition repair at PSII. Photoinhibition at PSI was much slower than at PSII and was also similar between the wild type and both mutants, despite the known instability of PSI in the psaE– mutant. We conclude that photoinhibitory light induces sufficient PSI-driven cyclic electron transport in both the ndhB– and psaE– mutants to fulfill any role that cyclic electron transport plays in protection against photoinhibition.

4 Corresponding author: E-mail, sherbert@uwyo.edu; Fax, +1-307-766-2851; Phone, +1-307-766-4353.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 Plant Cell PhysiolHome page
W. Zhao, Q. Guo, and J. Zhao
A Membrane-Associated Mn-Superoxide Dismutase Protects the Photosynthetic Apparatus and Nitrogenase from Oxidative Damage in the Cyanobacterium Anabaena sp. PCC 7120
Plant Cell Physiol., April 1, 2007; 48(4): 563 - 572.
[Abstract] [Full Text] [PDF]

Home page
 J Exp BotHome page
G. N. Johnson
Cyclic electron transport in C3 plants: fact or artefact?
J. Exp. Bot., January 1, 2005; 56(411): 407 - 416.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.