| The Impact of Light Intensity on Shade-Induced Leaf Senescence. | |
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MedLine Citation:
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PMID: 22171633 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Plants often have to cope with altered light conditions, which in leaves induces various physiological responses ranging from photosynthetic acclimation to leaf senescence. However, our knowledge of the regulatory pathways by which shade and darkness induce leaf senescence remains incomplete. To determine to what extent reduced light intensities regulate the induction of leaf senescence, we performed a functional comparison between Arabidopsis leaves subjected to a range of shading treatments. Individually-covered leaves, which remained attached to the plant, were compared with respect to chlorophyll, protein, histology, expression of senescence-associated genes, capacity for photosynthesis and respiration, and Light Compensation Point (LCP). Mild shading induced photosynthetic acclimation and resource partitioning, which, together with a decreased respiration, lowered the LCP. Leaf senescence was induced only under strong shade, coinciding with a negative carbon balance and independent of the red / far-red ratio. Interestingly, while senescence was significantly delayed at very low light compared to darkness, phytochrome A mutant plants showed enhanced chlorophyll degradation under all shading treatments except complete darkness. Taken together, our results suggest that the induction of leaf senescence during shading depends on the efficiency of carbon fixation, which in turn appears to be modulated via light receptors such as phytochrome A. © 2011 Blackwell Publishing Ltd. |
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Authors:
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Bastiaan Brouwer; Agnieszka Ziolkowska; Matthieu Bagard; Olivier Keech; Per Gardeström |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-15 |
Journal Detail:
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Title: Plant, cell & environment Volume: - ISSN: 1365-3040 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-16 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9309004 Medline TA: Plant Cell Environ Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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© 2011 Blackwell Publishing Ltd. |
Affiliation:
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Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, S-90187 Umeå, Sweden. Unité Mixte de Recherche Bioemco, Équipe IBIOS, Université Paris Est Créteil, 94010 Créteil cedex, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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