High salt stress in coupled and uncoupled thylakoid membranes: A comparative study
| العنوان: | High salt stress in coupled and uncoupled thylakoid membranes: A comparative study |
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| المؤلفون: | Anjana Jajoo, Pooja Mehta, Sonal Mathur, Suleyman I. Allakhverdiev, Sudhakar Bharti |
| المصدر: | Biochemistry (Moscow). 74:620-624 |
| بيانات النشر: | Pleiades Publishing Ltd, 2009. |
| سنة النشر: | 2009 |
| مصطلحات موضوعية: | Chlorophyll, Chlorophyll a, Photosystem II, macromolecular substances, Sodium Chloride, Thylakoids, Biochemistry, Fluorescence, Divalent, Electron Transport, chemistry.chemical_compound, Osmotic Pressure, Spinacia oleracea, Stress, Physiological, Cations, F-ATPase, polycyclic compounds, chemistry.chemical_classification, Chromatography, biology, Uncoupling Agents, Osmolar Concentration, Photosystem II Protein Complex, food and beverages, General Medicine, biology.organism_classification, Electron transport chain, Coupling (electronics), Kinetics, chemistry, Thylakoid, Biophysics, Spinach |
| الوصف: | The effect of high salt concentration on photosystem II (PS II) electron transport rates and chlorophyll a fluorescence induction kinetics was investigated in coupled and uncoupled spinach thylakoid membranes. With increase in salt concentration, the rates of electron transport mediated by PS II and the F(v)/F(m) ratio were affected more in uncoupled thylakoids as compared to coupled thylakoid membranes. The uncoupled thylakoid membranes seemed to behave like coupled thylakoid membranes at high NaCl concentration (approximately 1 M). On increasing the salt concentration, the uncoupler was found to be less effective and Na+ probably worked as a coupling enhancer or uncoupling suppressor. We suggest that positive charge of Na+ mimics the function of positive charge of H+ in the thylakoid lumen in causing coupled state. The function of NaCl (monovalent cation) could be carried out by even lower concentration of Ca2+ (divalent cation) or Al3+ (trivalent cation). We conclude that this function of NaCl as coupling enhancer is not specific, and in general a positive charge is required for causing coupling in uncoupled thylakoid membranes. |
| تدمد: | 1608-3040 0006-2979 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1c27a1d1e38b87000f6a33e4e6bfc4e3Test https://doi.org/10.1134/s0006297909060054Test |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....1c27a1d1e38b87000f6a33e4e6bfc4e3 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 16083040 00062979 |
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