A salinity-induced C3-CAM transition increases energy conservation in the halophyte Mesembryanthemum crystallinum L |
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Authors: | Niewiadomska Ewa Karpinska Barbara Romanowska Elzbieta Slesak Ireneusz Karpinski Stanislaw |
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Institution: | Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239 Krakow. e.niewiadomska@ifr-pan.krakow.pl |
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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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