Abstract
Alternative oxidase (AOX), the unique terminal oxidase in plant mitochondria, catalyzes the energy-wasteful cyanide-resistant respiration. Although it has been suggested that AOX would prevent chloroplast over-reduction via the efficient dissipation of excess reducing equivalents, its direct evidence in the physiological context has been lacking. In the present study, we assessed this possibility using Arabidopsis mutants defective in the cyclic electron flow around PSI. In these mutants, AOX was up-regulated concomitant with the accumulation of reducing equivalents in the chloroplasts and an increase in the activities of enzymes needed to transport reducing equivalents. The presented results indicate that AOX can dissipate the excess light energy and serve in efficient photosynthesis.
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Yoshida, K., Terashima, I., Noguchi, K. (2008). Functional Analysis of Mitochondrial Respiratory Chain as a Dissipation System of Excess Light Energy. In: Allen, J.F., Gantt, E., Golbeck, J.H., Osmond, B. (eds) Photosynthesis. Energy from the Sun. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6709-9_234
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DOI: https://doi.org/10.1007/978-1-4020-6709-9_234
Publisher Name: Springer, Dordrecht
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