Strategies to maintain redox homeostasis during photosynthesis under changing conditions

Autor(en): Scheibe, R 
Backhausen, JE
Emmerlich, V
Holtgrefe, S
Stichwörter: ARABIDOPSIS-THALIANA; CYCLIC ELECTRON-TRANSPORT; EXPRESSION PROFILES; light acclimation; LIGHT ENVIRONMENT; malate valve; MEHLER REACTION; METABOLIC ENZYMES; NADP-MALATE DEHYDROGENASE; OVER-REDUCTION; OXIDATIVE STRESS; photosynthesis; Plant Sciences; poising mechanisms; REACTIVE OXYGEN; redox control; redox homeostasis; regulatory networks
Erscheinungsdatum: 2005
Volumen: 56
Ausgabe: 416
Startseite: 1481
Seitenende: 1489
Plants perform photosynthesis and assimilatory processes in a continuously changing environment. Energy production in the various cell compartments and energy consumption in endergonic processes have to be well adjusted to the varying conditions. In addition, dissipatory pathways are required to avoid any detrimental effects caused by over-reduction. A large number of short-term and long-term mechanisms interact with each other in a flexible way, depending on intensity and the type of impact. Therefore, all levels of regulation are involved, starting from energy absorption and electron flow events through to post-transcriptional control. The simultaneous presence of strong oxidants and strong reductants during oxygenic photosynthesis is the basis for regulation. However, redox-dependent control also interacts with other signal transduction pathways in order to adapt metabolic processes and redox-control to the developmental state. Examples are given here for short-term and long-term control following changes of light intensity and photoperiod, focusing on the dynamic nature of the plant regulatory systems. An integrating network of all these mechanisms exists at all levels of control. Cellular homeostasis will be maintained as long as the mechanisms for acclimation are present in sufficiently high capacities. If an impact is too rapid, and acclimation on the level of gene expression cannot occur, cellular damage and cell death are initiated.
17th International Botanical Congress, Vienna, AUSTRIA, JUL 17-23, 2005
ISSN: 00220957
DOI: 10.1093/jxb/eri181

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