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Light at night resynchronizes the evening-phased rhythms of TOC1 and ELF4 in Phaseolus vulgaris.
MedLine Citation:
PMID:  22284718     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Circadian clocks regulate the adaptation of the organisms' physiology to the environmental light-dark cycles. Photic resetting of the clock differs among plant species. In Arabidopsis thaliana, morning-phased genes are not responsive to light signals at night, while in Phaseolus vulgaris, morning-phased genes are responsive to light at trough phases that are reached during the night. In order to explore this further, in this work we investigated the light-responsiveness at night of two P. vulgaris evening phased genes, the orthologs of TOC1 and ELF4. Our results demonstrate that the oscillation of their expression is symphasic under all applied photic conditions. Thus, under photoperiod peak phases are obtained in the evening (LD 12:12) or early at night (LD 6:18). Light application at the beginning of the night under LD 6:18 results in a phase shift of the PvTOC1 and PvELF4 oscillation, while at the end of the night the phase remains unchanged. Moreover, when light is applied at the narrow time window of the peak phase, a significant transient increase in the expression of both PvTOC1 and PvELF4 is caused. These results indicate that, depending on the plant species, evening-phased genes may also participate in the resetting of the circadian clock machinery by light.
Authors:
Angeliki Galeou; Anastasia Prombona
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Publication Detail:
Type:  Journal Article     Date:  2012-01-03
Journal Detail:
Title:  Plant science : an international journal of experimental plant biology     Volume:  184     ISSN:  1873-2259     ISO Abbreviation:  Plant Sci.     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-01-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882015     Medline TA:  Plant Sci     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  141-7     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.
Affiliation:
Institute of Biology, Chronobiology Laboratory, NCSR Demokritos, 15310 Aghia Paraskevi, Attiki, Greece.
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