A Salinity-Induced C 3 -CAM Transition Increases Energy Conservation in the Halophyte Mesembryanthemum crystallinum L.

Author： Niewiadomska Ewa   Karpinska Barbara   Romanowska Elzbieta   Slesak Ireneusz   Karpinski Stanislaw  

Publisher： Oxford University Press

ISSN： 0032-0781

Source： Plant and Cell Physiology, Vol.45, Iss.6, 2004-06, pp. : 789-794

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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.

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