Plant Physiol.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

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 Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Web of Science (40)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Götz, T.
Right arrow Articles by Sandmann, G.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Götz, T.
Right arrow Articles by Sandmann, G.
Agricola
Right arrow Articles by Götz, T.
Right arrow Articles by Sandmann, G.

Protection of Photosynthesis against Ultraviolet-B Radiation by Carotenoids in Transformants of the Cyanobacterium Synechococcus PCC79421

Thomas Götz, Ute Windhövel, Peter Böger, and Gerhard Sandmann*

Lehrstuhl für Physiologie und Biochemie der Pflanzen, Universität Konstanz, P.O. Box 5560, D-78434 Konstanz, Germany (T.G., U.W., P.B.); and Botanisches Institut, FB Biologie, J.W. Goethe Universität, P.O. Box 111932, D-60054 Frankfurt, Germany (G.S.)

The cyanobacterium Synechococcus PCC7942 was transformed with various carotenogenic genes, and the resulting transformants either accumulated higher amounts of beta -carotene and zeaxanthin or showed a shift in the carotenoid pattern toward the formation of zeaxanthin. These transformants were exposed to ultraviolet-B (UV-B) radiation, and the degradation of phycobilins, the inactivation of photosynthetic oxygen evolution, and the activity of photosystem II were determined. In the genetically modified cells, the influence on destruction of phycobilins was negligible. However, protection of photosynthetic reactions against UV-B damage was observed and was dependent on the carotenoid concentrations in the different transformants. Furthermore, it was shown that endogenous zeaxanthin is more effective than beta -carotene. Our results suggest that carotenoids exert their protective function as antioxidants to inactivate UV-B-induced radicals in the photosynthetic membrane.

1   This work was supported by a grant from the Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie, Germany (grant no. 07UVB07).
*   Corresponding author; e-mail Sandmann{at}em.uni-frankfurt.d400.de; fax 49-69-798-24822.

Plant Physiol. (1999) 120: 599-604
Copyright Clearance Center:   0032-0889/99/120//06
© 1999 American Society of Plant Physiologists




This article has been cited by other articles:


Home page
 Plant Cell PhysiolHome page
G. Holzl, U. Zahringer, D. Warnecke, and E. Heinz
Glycoengineering of Cyanobacterial Thylakoid Membranes for Future Studies on the Role of Glycolipids in Photosynthesis
Plant Cell Physiol., November 1, 2005; 46(11): 1766 - 1778.
[Abstract] [Full Text] [PDF]

Home page
 GlycobiologyHome page
G. Holzl, M. Leipelt, C. Ott, U. Zahringer, B. Lindner, D. Warnecke, and E. Heinz
Processive lipid galactosyl/glucosyltransferases from Agrobacterium tumefaciens and Mesorhizobium loti display multiple specificities
Glycobiology, September 1, 2005; 15(9): 874 - 886.
[Abstract] [Full Text] [PDF]

Home page
 Plant Physiol.Home page
F. Domergue, P. Spiekermann, J. Lerchl, C. Beckmann, O. Kilian, P. G. Kroth, W. Boland, U. Zahringer, and E. Heinz
New Insight into Phaeodactylum tricornutum Fatty Acid Metabolism. Cloning and Functional Characterization of Plastidial and Microsomal Delta 12-Fatty Acid Desaturases
Plant Physiology, April 1, 2003; 131(4): 1648 - 1660.
[Abstract] [Full Text] [PDF]

Home page
 Plant Cell PhysiolHome page
A. L. White and L. S. Jahnke
Contrasting Effects of UV-A and UV-B on Photosynthesis and Photoprotection of {beta}-carotene in two Dunaliella spp.
Plant Cell Physiol., August 15, 2002; 43(8): 877 - 884.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1999 by the American Society of Plant Biologists