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Plant Physiology 86:946-950 (1988)
© 1988 American Society of Plant Biologists

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Environmental and Stress Physiology

Fluorescence Characteristics of Photoinhibition and Recovery in a Sun and a Shade Species of the Red Algal Genus Porphyra1

Salil Bose, Stephen K. Herbert and David C. Fork

Centre for Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India, Friday Harbor Laboratories, Friday Harbor, Washington 98250, Carnegie Institution of Washington, Department of Plant Biology, Stanford, California 94305

The effects of light treatment (2000 micromole photons per square meter per second) for varying periods (up to 60 minutes) on chlorophyll fluorescence characteristics and light-limited rates of O2 evolution were examined in two Porphyra species. Brief light exposures (5-60 seconds) produced a large decrease in variable fluorescence which was not accompained by photoinhibition of light-limited O2 evolution rates. This rapid decrease in variable fluorescence was suppressed by carbonylcyanide m-chlorophenylhydrazone, indicating that it was related to formation of a proton gradient across the thylakiod membranes. A second phase of fluorescence quenching started after 5 minutes of illumination in the case of the shade species, Porphyra nereocystis Anderson, and after 30 minutes of illumination in the case of the sun species, Porphyra perforata J. Agardh. The rate of fluorescence quenching in the second phase was similar to the rate of photoinhibition of light-limited O2 evolution in both cases. The dark recovery of variable fluorescence in light-treated plants was also biphasic consisting of a rapid first phase and a slower second phase in both the Porphyra species. Recovery of P. perforata was more complete than that of P. nereocystis over the same recovery period. This greater capacity for recovery could represent a mechanism by which P. perforata is more resistant to photoinhibition than P. nereocystis.

1 Carnegie Institution of Washington-Department of Plant Biology Publication No. 1006. S. B. and S. K. H, acknowledge fellowship support from the Carnegie Institution of Washington, Department of Plant Biology during this study.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1988 by the American Society of Plant Biologists