| Nonphotosynthetic retardation of chloroplast senescence by light. | |
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MedLine Citation:
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PMID: 16657249 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Excised apical portions of green wheat leaf sections were treated with aminotriazole to prevent formation of new chloroplasts. Illumination retarded the decline in chlorophyll content per leaf section, the disintegration of chloroplast ultrastructure, and the loss of capacity for photosynthetic carbon fixation. We interpret these 3 effects of illumination as facets of a single light effect in retarding chloroplast senescence. This light effect in retarding chloroplast senescence has features differing from characteristics of photosynthetic carbon fixation. For example, A) application of the photosynthetic inhibitor 3-(3,4-dichlorophenyl)-1, 1-dimethylurea did not decrease, and may have even slightly increased, the effectiveness of light; B) although the action spectrum contains peaks in the blue and red regions, it differs from the action spectrum for photosynthetic CO(2) assimilation in wheat; C) in nonphotosynthesizing tissue, application of sugars did not retard chloroplast senescence; D) light saturation was achieved by only a few hundred microwatts/cm(2). Considered together with the well-known light requirement for chloroplast formation, our results indicate that light has a dual, photomorphogenetic control in maintaining the green status of the plant by also exerting a second effect: retarding of senescence of chloroplasts already present. |
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Authors:
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A H Haber; P J Thompson; P L Walne; L L Triplett |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Plant physiology Volume: 44 ISSN: 0032-0889 ISO Abbreviation: Plant Physiol. Publication Date: 1969 Nov |
Date Detail:
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Created Date: 2010-06-29 Completed Date: 2010-06-29 Revised Date: 2010-09-15 |
Medline Journal Info:
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Nlm Unique ID: 0401224 Medline TA: Plant Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 1619-28 Citation Subset: - |
Affiliation:
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Biology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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