Document Detail


Responses of ferns to red light are mediated by an unconventional photoreceptor.
MedLine Citation:
PMID:  12529647     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Efficient photosynthesis is essential for plant survival. To optimize photosynthesis, plants have developed several photoresponses. Stems bend towards a light source (phototropism), chloroplasts move to a place of appropriate light intensity (chloroplast photorelocation) and stomata open to absorb carbon dioxide. These responses are mediated by the blue-light receptors phototropin 1 (phot1) and phototropin 2 (phot2) in Arabidopsis (refs 1-5). In some ferns, phototropism and chloroplast photorelocation are controlled by red light as well as blue light. However, until now, the photoreceptor mediating these red-light responses has not been identified. The fern Adiantum capillus-veneris has an unconventional photoreceptor, phytochrome 3 (phy3), which is a chimaera of the red/far-red light receptor phytochrome and phototropin. We identify here a function of phy3 for red-light-induced phototropism and for red-light-induced chloroplast photorelocation, by using mutational analysis and complementation. Because phy3 greatly enhances the sensitivity to white light in orienting leaves and chloroplasts, and PHY3 homologues exist among various fern species, this chimaeric photoreceptor may have had a central role in the divergence and proliferation of fern species under low-light canopy conditions.
Authors:
Hiroko Kawai; Takeshi Kanegae; Steen Christensen; Tomohiro Kiyosue; Yoshikatsu Sato; Takato Imaizumi; Akeo Kadota; Masamitsu Wada
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Nature     Volume:  421     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  2003 Jan 
Date Detail:
Created Date:  2003-01-16     Completed Date:  2003-02-25     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  287-90     Citation Subset:  IM    
Affiliation:
Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/AB089917;  AB089918;  AB089919
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MeSH Terms
Descriptor/Qualifier:
Adiantum / genetics,  physiology*,  radiation effects*
Color*
Genes, Plant / genetics
Genetic Complementation Test
Light*
Molecular Sequence Data
Mutation / genetics
Phenotype
Photoreceptor Cells / physiology*,  radiation effects*
Phototropism / radiation effects
Plant Leaves / genetics,  physiology,  radiation effects
Plant Proteins / genetics
Chemical
Reg. No./Substance:
0/Plant Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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