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Plant and Cell Physiology, 2004, Vol. 45, No. 6 789-794
© 2004 Oxford University Press

Short Communication

A Salinity-Induced C3-CAM Transition Increases Energy Conservation in the Halophyte Mesembryanthemum crystallinum L.

Ewa Niewiadomska1,4, Barbara Karpinska2, Elzbieta Romanowska3, Ireneusz Slesak1 and Stanislaw Karpinski2

1 Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239 Krakow, Poland
2 Department of Botany, Stockholm University, Lilla Frescativ. 5, Frescati, SE-10691 Stockholm, Sweden
3 Department of Plant Physiology, Botanical Institute, Warsaw University, Miecznikowa 1, 02-926 Warsaw, Poland

Abstract

A strongly increased ATP/ADP ratio was found during the nocturnal phase I in crassulacean acid metabolism (CAM)-induced Mesembryanthemum crystallinum plants. Conversely, during the daytime phase III in CAM-performing plants the ATP/ADP ratio dropped to a similar level to that of C3 plants, cytochrome c oxidase activity was stimulated and mitochondrial Mn-superoxide dismutase activity was strongly increased. The findings suggest that a salinity-induced C3-CAM transition might be an efficient energy-conserving strategy for M. crystallinum plants, in which the strong nocturnal ATP production seems to be, at least partially, independent from the coupled mitochondrial electron transport.

Footnotes

4 Corresponding author: E-mail, e.niewiadomska{at}ifr-pan.krakow.pl; Fax, +48-12-4251844.


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