Document Detail


Light regulation of circadian clock-controlled gene expression in rice.
MedLine Citation:
PMID:  11489174     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Using transgenic rice seedlings expressing a firefly luciferase (luc) gene under the control of a rice CAB (chlorophyll a/b binding protein) promoter, we demonstrated how light affects circadian clocks in the transcription of the CAB gene. Rhythmic luc expression was observed for more than 5 d under constant light and dark (DD) conditions after light/dark entrainment. After a light pulse was applied at different time points in DD various temporal patterns of CAB gene expression were individually observed. We first examined two distinct properties related to the entrainment mechanism of the circadian clock: fluence-rate dependence of free-running periods (FRPs) and phase resetting by a light pulse. Although fluence-rate dependent shortening of FRP was demonstrated, the FRP in DD was almost equal to that in constant light of a middle fluence-rate, indicating that this fluence-rate dependence may not fully describe the entrainment of the circadian clock in rice. Typical phase responses of the circadian clock by a single light pulse were also observed at the transcriptional level in rice seedlings. Thus, the phase resettings upon the light/dark transitions of daily cycles may be sufficient to explain the entrainment mechanisms of rice. We have further demonstrated that, in addition to having a gating effect to acute response, a light pulse can activate the circadian clock-controlled CAB1R gene expression at the first circadian peak in a phase-dependent manner. This suggests that light activates circadian clock activity in the diurnal CAB gene expression under daily light/dark cycles.
Authors:
N Sugiyama; T Izawa; T Oikawa; K Shimamoto
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Plant journal : for cell and molecular biology     Volume:  26     ISSN:  0960-7412     ISO Abbreviation:  Plant J.     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-08-07     Completed Date:  2001-10-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9207397     Medline TA:  Plant J     Country:  England    
Other Details:
Languages:  eng     Pagination:  607-15     Citation Subset:  IM    
Affiliation:
Laboratory of Plant Molecular Genetics, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0101, Japan.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/D12629;  X13908
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MeSH Terms
Descriptor/Qualifier:
Circadian Rhythm / genetics*
Gene Expression Regulation, Plant / radiation effects*
Light*
Light-Harvesting Protein Complexes*
Luciferases / genetics
Molecular Sequence Data
Oryza sativa / genetics*
Photosynthetic Reaction Center Complex Proteins / genetics*
RNA, Messenger / genetics
Chemical
Reg. No./Substance:
0/Light-Harvesting Protein Complexes; 0/Photosynthetic Reaction Center Complex Proteins; 0/RNA, Messenger; 0/fucoxanthin-, chlorophyll a-c-containing protein; EC 1.13.12.-/Luciferases

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