Plant Physiol. Drug Metab Dispos
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Plant Physiology 68:355-357 (1981)
© 1981 American Society of Plant Biologists

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Articles

Nocturnal Accumulation of Malic Acid Occurs in Mesophyll Tissue without Proton Transport to Epidermal Tissue in the Inducible Crassulacean Acid Metabolism Plant Mesembryanthemum crystallinum1

EVIDENCE AGAINST A PREVIOUS HYPOTHESIS

Klaus Winter2, Gerald E. Edwards2,3 and Joseph A. M. Holtum4

2 Department of Horticulture, University of Wisconsin, Madison, Wisconsin 53706, 4 Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706

The inducible Crassulacean acid metabolism plant, Mesembryanthemum crystallinum, accumulates malic acid, i.e. equivalent amounts of malate anions and protons in the mesophyll cells at night. Levels of malate and titratable acidity are low in the epidermal tissue and do not change significantly during the day/night cycle. This result is in contrast to a recent report (Bloom 1979 Plant Physiol 64: 919-923) that the synthesis of malic acid during dark CO2 fixation is associated with an equivalent exchange of inorganic cations from epidermal tissue with protons in the mesophyll cells.

3 To whom requests for reprints should be addressed, at Department of Botany, Washington State University, Pullman, WA 99164.

1 Supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, National Science Foundation Grant PCM 77-09384 (to G. E. E.), and Grant 59-2551-0-1-447-0, Research Grants Office, United States Department of Agriculture (to M. H. O'Leary, Department of Chemistry, whose funds help support J. A. M. H.).




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U. LUTTGE
Ecophysiology of Crassulacean Acid Metabolism (CAM)
Ann. Bot., June 1, 2004; 93(6): 629 - 652.
[Abstract] [Full Text] [PDF]


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Copyright © 1981 by the American Society of Plant Biologists