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Plant Physiology 56:613-616 (1975)
© 1975 American Society of Plant Biologists

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Articles

Effects of Osmotic Gradients on Vacuolar Malic Acid Storage

A Basic Principle in Oscillatory Behavior of Crassulacean Acid Metabolism 1

Ulrich Lüttge, Manfred Kluge and Erika Ball

a Botanisches Institut, Fachbereich Biologie, Technische Hochschule Darmstadt, D-6100 Darmstadt, Germany

Malate synthesis by CO2 dark fixation and malate accumulation in the vacuoles of leaf slices of Kalanchoë daigremontiana Hamet et Perrier, a plant performing crassulacean acid metabolism, occurs only in external solutions where the osmotic pressure difference between the cells and the medium is low. Conversely, malate loss from the vacuoles depends on a high osmotic pressure difference between the cells and the medium and is observed in media of low osmotic pressure. This suggests that the diurnal oscillations of malate levels in crassulacean acid metabolism leaf cells are regulated by osmotic gradients. These findings support a model which is introduced to explain how the rhythm of crassulacean acid metabolism may function in the intact plant.

1 This work was supported by the Deutsche Forschungsgemeinschaft in connection with two specially funded programs, "Structure and Function of Biological Membranes" (U.L.) and "Biochemical Basis of Ecological Adaptations in Plants" (M.K.).




This article has been cited by other articles:


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T. P. Wyka and U. E. Luttge
Contribution of C3 carboxylation to the circadian rhythm of carbon dioxide uptake in a Crassulacean acid metabolism plant Kalanchoe daigremontiana
J. Exp. Bot., May 1, 2003; 54(386): 1471 - 1479.
[Abstract] [Full Text] [PDF]

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U. Luttge
CO2-concentrating: consequences in crassulacean acid metabolism
J. Exp. Bot., November 1, 2002; 53(378): 2131 - 2142.
[Abstract] [Full Text] [PDF]


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Copyright © 1975 by the American Society of Plant Biologists