The Plant cell, 2012-07, Vol.24 (7), p.2934-2948
2012
Details
- Autor(en) / Beteiligte
- Titel
- PROTON GRADIENT REGULATION5 Is Essential for Proper Acclimation of Arabidopsis Photosystem I to Naturally and Artificially Fluctuating Light Conditions
- Ist Teil von
- The Plant cell, 2012-07, Vol.24 (7), p.2934-2948
- Ort / Verlag
- England: American Society of Plant Biologists
- Erscheinungsjahr
- 2012
- Link zum Volltext
- Quelle
- EZB-FREE-00999 freely available EZB journals
- Beschreibungen/Notizen
- In nature, plants are challenged by constantly changing light conditions. To reveal the molecular mechanisms behind acclimation to sometimes drastic and frequent changes in light intensity, we grew Arabidopsis thaliana under fluctuating light conditions, in which the low light periods were repeatedly interrupted with high light peaks. Such conditions had only marginal effect on photosystem II but induced damage to photosystem I (PSI), the damage being most severe during the early developmental stages. We showed that PROTON GRADIENT REGULATIONS (PGR5)—dependent regulation of electron transfer and proton motive force is crucial for protection of PSI against photodamage, which occurred particularly during the high light phases of fluctuating light cycles. Contrary to PGR5, the NAD(P)H dehydrogenase complex, which mediates cyclic electron flow around PSI, did not contribute to acclimation of the photosynthetic apparatus, particularly PSI, to rapidly changing light intensities. Likewise, the Arabidopsis pgr5 mutant exhibited a significantly higher mortality rate compared with the wild type under outdoor field conditions. This shows not only that regulation of PSI under natural growth conditions is crucial but also the importance of PGR5 in PSI protection.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 1040-4651, 1532-298XeISSN: 1532-298XDOI: 10.1105/tpc.112.097162Titel-ID: cdi_swepub_primary_oai_DiVA_org_umu_61231
- Format
- –
- Schlagworte
- Acclimatization, Acclimatization - physiology, Acclimatization - radiation effects, Analysis, Antioxidants - metabolism, Arabidopsis - genetics, Arabidopsis - physiology, Arabidopsis - radiation effects, Arabidopsis Proteins - genetics, Arabidopsis Proteins - metabolism, Arabidopsis thaliana, Cell Respiration - radiation effects, Electron transfer, Electron Transport - radiation effects, Gene Expression Regulation, Plant - radiation effects, Leaves, Light, Luminous intensity, Models, Molecular, Mutation, Oxidation-Reduction - radiation effects, Oxidative Stress - radiation effects, Phenotype, Photons, Photosynthesis, Photosynthetic Reaction Center Complex Proteins - genetics, Photosynthetic Reaction Center Complex Proteins - metabolism, Photosystem I Protein Complex - radiation effects, Photosystem II Protein Complex - radiation effects, Physiological aspects, Plant cells, Plant growth, Plant Leaves - genetics, Plant Leaves - physiology, Plant Leaves - radiation effects, Plants, Protein-protein interactions, Proton-Motive Force - radiation effects, Reactive Oxygen Species - metabolism, Seedlings, Seedlings - genetics, Seedlings - physiology, Seedlings - radiation effects, Thylakoids