| Phytochromes inhibit hypocotyl negative gravitropism by regulating the development of endodermal amyloplasts through phytochrome-interacting factors. | |
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MedLine Citation:
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PMID: 21220341 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Phytochromes are red and far-red light photoreceptors that regulate various aspects of plant development. One of the less-understood roles of phytochromes is the inhibition of hypocotyl negative gravitropism, which refers to the loss of hypocotyl gravitropism and resulting random growth direction in red or far-red light. This light response allows seedlings to curve toward blue light after emergence from the soil and enhances seedling establishment in the presence of mulch. Phytochromes inhibit hypocotyl negative gravitropism by inhibiting four phytochrome-interacting factors (PIF1, PIF3, PIF4, PIF5), as shown by hypocotyl agravitropism of dark-grown pif1 pif3 pif4 pif5 quadruple mutants. We show that phytochromes inhibit negative gravitropism by converting starch-filled gravity-sensing endodermal amyloplasts to other plastids with chloroplastic or etioplastic features in red or far-red light, whereas PIFs promote negative gravitropism by inhibiting the conversion of endodermal amyloplasts to etioplasts in the dark. By analyzing transgenic plants expressing PIF1 with an endodermis-specific SCARECROW promoter, we further show that endodermal PIF1 is sufficient to inhibit the conversion of endodermal amyloplasts to etioplasts and hypocotyl negative gravitropism of the pif quadruple mutant in the dark. Although the functions of phytochromes in gravitropism and chloroplast development are normally considered distinct, our results indicate that these two functions are closely related. |
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Authors:
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Keunhwa Kim; Jieun Shin; Sang-Hee Lee; Hee-Seok Kweon; Julin N Maloof; Giltsu Choi |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2011-01-10 |
Journal Detail:
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Title: Proceedings of the National Academy of Sciences of the United States of America Volume: 108 ISSN: 1091-6490 ISO Abbreviation: Proc. Natl. Acad. Sci. U.S.A. Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-01-26 Completed Date: 2011-04-26 Revised Date: 2011-08-01 |
Medline Journal Info:
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Nlm Unique ID: 7505876 Medline TA: Proc Natl Acad Sci U S A Country: United States |
Other Details:
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Languages: eng Pagination: 1729-34 Citation Subset: IM |
Affiliation:
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Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Arabidopsis
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genetics,
growth & development,
radiation effects Arabidopsis Proteins / genetics, physiology* Basic Helix-Loop-Helix Transcription Factors / genetics, physiology* Chloroplasts / metabolism, ultrastructure Gene Expression Profiling Gene Expression Regulation, Developmental / radiation effects Gene Expression Regulation, Plant / radiation effects Gravitropism / physiology*, radiation effects Hypocotyl / genetics, growth & development*, radiation effects Microscopy, Electron, Transmission Mutation Phytochrome A / genetics, physiology* Phytochrome B / genetics, physiology* Plants, Genetically Modified Plastids / metabolism, ultrastructure Seedling / genetics, growth & development, radiation effects |
| Chemical | |
Reg. No./Substance:
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0/Arabidopsis Proteins; 0/Basic Helix-Loop-Helix Transcription Factors; 0/PHYA protein, Arabidopsis; 0/PHYB protein, Arabidopsis; 0/PIF1 protein, Arabidopsis; 0/PIF3 protein, Arabidopsis; 0/PIF4 protein, Arabidopsis; 0/PIF5 protein, Arabidopsis; 0/Phytochrome A; 136250-22-1/Phytochrome B |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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