Document Detail

Bell-like homeodomain selectively regulates the high-irradiance response of phytochrome A.
MedLine Citation:
PMID:  19666535     Owner:  NLM     Status:  MEDLINE    
Plant responses mediated by phytochrome A display a first phase saturated by transient light signals and a second phase requiring sustained excitation with far-red light (FR). These discrete outcomes, respectively so-called very-low-fluence response (VLFR) and high-irradiance response (HIR), are appropriate in different environmental and developmental contexts but the mechanisms that regulate the switch remain unexplored. Promoter analysis of a light-responsive target gene revealed a motif necessary for HIR but not for VLFR. This motif is required for binding of the Bell-like homeodomain 1 (BLH1) to the promoter in in vitro and in yeast 1-hybrid experiments. Promoter substitutions that increased BLH1 binding also enhanced HIR. blh1 mutants showed reduced responses to continuous FR and to deep canopy shadelight, but they retained normal responses to pulsed FR or red light and unfiltered sunlight. BLH1 enhanced BLH1 expression and its promotion by FR. We conclude that BLH1 specifically regulates HIR and not VLFR of phytochrome A.
Roberto J Staneloni; María José Rodriguez-Batiller; Danilo Legisa; María R Scarpin; Adamantia Agalou; Pablo D Cerdán; Annemarie H Meijer; Pieter B F Ouwerkerk; Jorge J Casal
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-07-28
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  106     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2009 Aug 
Date Detail:
Created Date:  2009-08-26     Completed Date:  2009-09-21     Revised Date:  2013-06-02    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  13624-9     Citation Subset:  IM    
Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas Buenos Aires, Consejo Nacional de Investigaciones Cientificas y Técnicas and Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1405BWE Buenos Aires, Argentina.
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MeSH Terms
Arabidopsis / genetics,  metabolism*,  radiation effects*
Arabidopsis Proteins / genetics,  metabolism*
Base Sequence
Gene Expression Profiling
Homeodomain Proteins / metabolism*
Mutation / genetics
Phytochrome A / metabolism*
Promoter Regions, Genetic / genetics
Protein Binding / radiation effects
Transcription Factors / genetics,  metabolism*
Reg. No./Substance:
0/Arabidopsis Proteins; 0/BLH1 protein, Arabidopsis; 0/Homeodomain Proteins; 0/Phytochrome A; 0/Transcription Factors

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