| Characterization of the photosynthetic apparatus in cortical bark chlorenchyma of Scots pine. | |
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MedLine Citation:
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PMID: 16333639 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Winter-induced inhibition of photosynthesis in Scots pine (Pinus sylvestris L.) needles is accompanied by a 65% reduction of the maximum photochemical efficiency of photosystem II (PSII), measured as Fv/Fm, but relatively stable photosystem I (PSI) activity. In contrast, the photochemical efficiency of PSII in bark chlorenchyma of Scots pine twigs was shown to be well preserved, while PSI capacity was severely decreased. Low-temperature (77 K) chlorophyll fluorescence measurements also revealed lower relative fluorescence intensity emitted from PSI in bark chlorenchyma compared to needles regardless of the growing season. Nondenaturating SDS-PAGE analysis of the chlorophyll-protein complexes also revealed much lower abundance of LHCI and the CPI band related to light harvesting and the core complex of PSI, respectively, in bark chlorenchyma. These changes were associated with a 38% reduction in the total amount of chlorophyll in the bark chlorenchyma relative to winter needles, but the Chl a/b ratio and carotenoid composition were similar in the two tissues. As distinct from winter pine needles exhibiting ATP/ADP ratio of 11.3, the total adenylate content in winter bark chlorenchyma was 2.5-fold higher and the estimated ATP/ADP ratio was 20.7. The photochemical efficiency of PSII in needles attached to the twig recovered significantly faster (28-30 h) then in detached needles. Fluorescence quenching analysis revealed a high reduction state of Q(A) and the PQ-pool in the green bark tissue. The role of bark chlorenchyma and its photochemical performance during the recovery of photosynthesis from winter stress in Scots pine is discussed. |
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Authors:
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Alexander G Ivanov; Marianna Krol; Dimitri Sveshnikov; Gunilla Malmberg; Per Gardeström; Vaughan Hurry; Gunnar Oquist; Norman P A Huner |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2005-12-07 |
Journal Detail:
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Title: Planta Volume: 223 ISSN: 0032-0935 ISO Abbreviation: Planta Publication Date: 2006 May |
Date Detail:
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Created Date: 2006-05-05 Completed Date: 2006-07-24 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 1250576 Medline TA: Planta Country: Germany |
Other Details:
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Languages: eng Pagination: 1165-77 Citation Subset: IM |
Affiliation:
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Department of Biology and the Biotron, University of Western Ontario, 1151 Richmond Str. N, London, ON, Canada N6A 5B7. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adenosine Diphosphate
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metabolism Adenosine Triphosphate / metabolism Chlorophyll / metabolism, physiology Chromatography, High Pressure Liquid Fluorescence Malate Dehydrogenase / metabolism Oxidation-Reduction Peptides / metabolism Phosphoenolpyruvate Carboxylase / metabolism Photosynthesis / physiology* Photosystem II Protein Complex / chemistry*, physiology Pigments, Biological / analysis Pinus sylvestris / anatomy & histology, metabolism*, physiology Plant Bark / anatomy & histology, metabolism*, physiology Seasons Temperature |
| Chemical | |
Reg. No./Substance:
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0/Peptides; 0/Photosystem II Protein Complex; 0/Pigments, Biological; 1406-65-1/Chlorophyll; 56-65-5/Adenosine Triphosphate; 58-64-0/Adenosine Diphosphate; EC 1.1.1.37/Malate Dehydrogenase; EC 1.1.1.38/malate dehydrogenase-(oxaloacetate-decarboxylating) (NAD+); EC 1.1.1.40/malate dehydrogenase (oxaloacetate-decarboxylating) (NADP+); EC 4.1.1.31/Phosphoenolpyruvate Carboxylase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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