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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




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