Journal Article

A Salinity-Induced C<sub>3</sub>-CAM Transition Increases Energy Conservation in the Halophyte <i>Mesembryanthemum crystallinum</i> L.

Ewa Niewiadomska, Barbara Karpinska, Elzbieta Romanowska, Ireneusz Slesak and Stanislaw Karpinski

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 45, issue 6, pages 789-794
Published in print June 2004 | ISSN: 0032-0781
Published online June 2004 | e-ISSN: 1471-9053 | DOI:
A Salinity-Induced C3-CAM Transition Increases Energy Conservation in the Halophyte Mesembryanthemum crystallinum L.

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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.

Keywords: Keywords: Alternative oxidase — ATP/ADP ratio — Cytochrome c oxidase — Mesembryanthemum crystallinum — MnSOD.; Abbreviations: AOX, alternative oxidase; CAM, crassulacean acid metabolism; COX, cytochrome c oxidase; ETC, electron transport chain; PAGE, polyacrylamide gel electrophoresis; PEPC, phosphoenolpyruvate carboxylase; SHAM, salicylhydroxamic acid; SOD, superoxide dismutase.

Journal Article.  3964 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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