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Plant Physiology 80:843-847 (1986)
© 1986 American Society of Plant Biologists

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Articles

The Effects of Osmotic Tissue Dehydration and Air Drying on Morphology and Energy Transfer in Two Species of Porphyra1

Celia M. Smith2, Kazuhiko Satoh3 and David C. Fork

Carnegie Institution of Washington, Department of Plant Biology, Stanford, California 94305

Studies were conducted to document the effects on morphology and energy transfer in photosynthesis of severe tissue dehydration induced either by air-drying or by immersing the tissues of two Porphyra species in hyperosmotic solutions. These studies showed that the dehydration-tolerant intertidal alga, Porphyra perforata J.Ag., was almost unaffected by either of these treatments, while the dehydration-sensitive Porphyra nereocystis Anders. was damaged similary by both treatments. Damage to that sensitive species was characterized by ruptured organelles as seen by interference microscopy as well as by increased fluorescence emission at 682 nanometers emanating from allophycocyanin. These results suggest that a disruption of energy transfer between allophycocyanin and chlorophyll a occurs because of the damage to membranes following tissue dehydration, and that the increase in the yield of phycobilin fluorescence is a good indicator of these phenomena. Thus, air-drying and osmotic-dehydration appear to have similar physiological consequences in a dehydration-sensitive alga but almost no effect in a tolerant species.

2 Present address: Department of Botany, National Museum of Natural History, Smithsonian Institute, Washington DC 20560

3 Present address: Department of Pure and Applied Sciences, College of Arts and Sciences, University of Tokyo, 3-8-1, Komaba, Meguro-ku, Tokyo 153, Japan.

1 Carnegie Institution of Washington, Department of Plant Biology, Publication No. 859.






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Copyright © 1986 by the American Society of Plant Biologists