Protection of photosystem II against UV-A and UV-B radiation in the cyanobacterium Plectonema boryanum: The role of growth temperature and growth irradiance

Photochemistry and Photobiology, Dec 2000 by Ivanov, Alexander G, Miskiewicz, Ewa, Clarke, Adrian K, Greenberg, Bruce M, Huner, Norman P A

Acknowledgements-This work was financially supported by the Natural Science and Engineering Research Council of Canada with a Collaborative Research Grant to B.G. and N.P.A.H. N.P.A.H. and A.K.C. acknowledge the financial support of the Swedish Foundation for International Cooperation in Research and Higher Education. The authors are grateful to Dr. Gunnar Oquist, Department of Plant Physiology, University of Umea, Umed, Sweden for the critical reading of the manuscript. This manuscript is dedicated to the memory of David E. Laudenbach.

[Posted on the website on 1 November 2000.

^Abbreviations: Chl, chlorophyll; Clp, ATP-dependent caseinolytic protease; Fm, maximal chlorophyll fluorescence in dark adapted state; F^sub omicron^, minimal chlorophyll fluorescence in dark adapted state; Fs, steady-state fluorescence yield; F,, variable fluorescence (Fm - F^sub omicron^); F,/Fm., maximal quantum efficiency of PSII; HPLC, highperformance liquid chromatography; OS-MAA, oligosaccharidemycosporine amino acid; PAR, photosynthetically active radiation; PPFD, photosynthetic photon flux density; PSH, photosystem II; qN, non-photochemical quenching coefficient; qP, photochemical quenching coefficient; Scy, scytonemin; TES, Ntris[hydroxymethyl]methyl-2-aminoethanesulfonic acid; UV-A, ultraviolet-A radiation; UV-B, ultraviolet-B radiation.

REFERENCES

1. Lao, K. and A. N. Glazer (1996) Ultraviolet-B photodestruction of a light-harvesting complex. Proc. Natl. Acad. Sci. USA 93, 5258-5263.

2. Pandey, R., S. Chauhan and G. S. Singhal (1997) UVB-induced photodamage to phycobilisomes of Synechococcus sp. PCC 7942. J. Photochem. Photobiol. B: Biol. 40, 228-232.

3. Campbell, D., MA. Eriksson, G. Oquist, P. Gustafsson and A. K. Clarke (1998) The cyanobacterium Synechococcus resists UV-B by exchanging potosystem II reaction-center Dl proteins. Proc. Natl. Acad. Sci. USA 95, 364-369.

4. Rai, L. C., B. Tyagi and N. Mallick (1996) Alternation in photosynthetic characteristics of Anabaena doliolum following exposure to UVB and Pb. Photochem. Photobiol. 64, 658-663.

5. D6hler, G., I. Biermann and J. Zink (1986) Impact of UV-B radiation on photosynthetic assimilation of '4C-bicarbonate and inorganic '5N-compounds by cyanobacteria. Z Naturforsch. 41c, 426-432.

6. Sinha, R. P., N. Singh, A. Kumar, H. D. Kumar, M. Haider and D.-P. Haider (1996) Effects of UV irradiation on certain physiological and biochemical processes in cyanobacteria. J. Photochem. Photobiol. B: Biol. 32, 107-113.

7. Giacometti, G. M., R. Barbato, S. Chiaramonte, G. Friso and F. Rigoni (1996) Effects of ultraviolet-B radiation on photosystem II of the cyanobacterium Synechocystis sp. PCC 6083. Eur. J. Biochem. 242, 799-806.

8. Vincent, W. F. and S. Roy (1993) Solar ultraviolet radiation and aquatic primary production: damage, protection and recovery. Environ. Rev. 1, 1-12.

9. Mittler, R. and E. Tel-Or (1991) Oxidative stress responses in the unicellular cyanobacterium Synechococcus PCC 7942. Free Radical Res. Commum. 12, 845-850.