A salinity-induced C3-CAM transition increases energy conservation in the halophyte Mesembryanthemum crystallinum L.
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.
Niewiadomska
Ewa
E
Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239 Krakow. e.niewiadomska@ifr-pan.krakow.pl
Karpinska
Barbara
B
Romanowska
Elzbieta
E
Slesak
Ireneusz
I
Karpinski
Stanislaw
S
D000244:Adenosine Diphosphate / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000096:biosynthesis*; D003624:Darkness; D004579:Electron Transport / Q000502:physiology; D003576:Electron Transport Complex IV / Q000378:metabolism; D004734:Energy Metabolism / Q000502:physiology*; D008027:Light; D035723:Mesembryanthemum / Q000378:metabolism*; D008928:Mitochondria / Q000378:metabolism; D010788:Photosynthesis / Q000502:physiology*; D012492:Salts / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000378:metabolism
D012492:Salts; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D013482:Superoxide Dismutase; D003576:Electron Transport Complex IV