| Photosynthesis-dependent but neochrome1-independent light positioning of chloroplasts and nuclei in the fern Adiantum capillus-veneris. | |
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MedLine Citation:
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PMID: 21248076 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Chloroplasts change their positions in the cell depending on the light conditions. In the dark, chloroplasts in fern prothallia locate along the anticlinal wall (dark position). However, chloroplasts become relocated to the periclinal wall (light position) when the light shines perpendicularly to the prothallia. Red light is effective in inducing this relocation in Adiantum capillus-veneris, and neochrome1 (neo1) has been identified as the red light receptor regulating this movement. Nevertheless, we found here that chloroplasts in neo1 mutants still become relocated from the dark position to the light position under red light. We tested four neo1 mutant alleles (neo1-1, neo1-2, neo1-3, and neo1-4), and all of them showed the red-light-induced chloroplast relocation. Furthermore, chloroplast light positioning under red light occurred also in Pteris vittata, another fern species naturally lacking the neo1-dependent phenomenon. The light positioning of chloroplasts occurred independently of the direction of red light, a response different to that of the neo1-dependent movement. Photosynthesis inhibitors 3-(3,4 dichlorophenyl)-1,1-dimethylurea or 2,5-dibromo-3-isopropyl-6-methyl-p-benzoquinone blocked this movement. Addition of sucrose (Suc) or glucose to the culture medium induced migration of the chloroplasts to the periclinal wall in darkness. Furthermore, Suc could override the effects of 3-(3,4 dichlorophenyl)-1,1-dimethylurea. Interestingly, the same light positioning was evident for nuclei under red light in the neo1 mutant. The nuclear light positioning was also induced in darkness with the addition of Suc or glucose. These results indicate that photosynthesis-dependent nondirectional movement contributes to the light positioning of these organelles in addition to the neo1-dependent directional movement toward light. |
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Authors:
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Yuka Sugiyama; Akeo Kadota |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2011-01-19 |
Journal Detail:
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Title: Plant physiology Volume: 155 ISSN: 1532-2548 ISO Abbreviation: Plant Physiol. Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-03-02 Completed Date: 2011-05-31 Revised Date: 2011-08-29 |
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: 1205-13 Citation Subset: IM |
Affiliation:
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Department of Biological Sciences, Graduate School of Science and Engineering, Tokyo Metropolitan University, Tokyo 192-0397, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adiantum
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cytology*,
drug effects,
metabolism,
radiation effects* Cell Nucleus / drug effects, metabolism*, radiation effects Chloroplasts / drug effects, metabolism*, radiation effects Darkness Diuron / pharmacology Glucose / pharmacology Light* Movement / drug effects, radiation effects Mutation / genetics Photosynthesis / drug effects, radiation effects* Sucrose / pharmacology Xanthophylls / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Xanthophylls; 0/neochrome; 330-54-1/Diuron; 50-99-7/Glucose; 57-50-1/Sucrose |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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