Document Detail


The circadian clock-associated small GTPase LIGHT INSENSITIVE PERIOD1 suppresses light-controlled endoreplication and affects tolerance to salt stress in Arabidopsis.
MedLine Citation:
PMID:  23144185     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Circadian clocks are biochemical timers regulating many physiological and molecular processes according to the day/night cycle. The small GTPase LIGHT INSENSITIVE PERIOD1 (LIP1) is a circadian clock-associated protein that regulates light input to the clock. In the absence of LIP1, the effect of light on free-running period length is much reduced. Here, we show that in addition to suppressing red and blue light-mediated photomorphogenesis, LIP1 is also required for light-controlled inhibition of endoreplication and tolerance to salt stress in Arabidopsis (Arabidopsis thaliana). We demonstrate that in the processes of endoreplication and photomorphogenesis, LIP1 acts downstream of the red and blue light photoreceptors phytochrome B and cryptochromes. Manipulation of the subcellular distribution of LIP1 revealed that the circadian function of LIP1 requires nuclear localization of the protein. Our data collectively suggest that LIP1 influences several signaling cascades and that its role in the entrainment of the circadian clock is independent from the other pleiotropic effects. Since these functions of LIP1 are important for the early stages of development or under conditions normally experienced by germinating seedlings, we suggest that LIP1 is a regulator of seedling establishment.
Authors:
Kata Terecskei; Réka Tóth; Péter Gyula; Eva Kevei; János Bindics; George Coupland; Ferenc Nagy; László Kozma-Bognár
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-11-08
Journal Detail:
Title:  Plant physiology     Volume:  161     ISSN:  1532-2548     ISO Abbreviation:  Plant Physiol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2012-12-31     Completed Date:  2013-06-18     Revised Date:  2014-01-09    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  278-90     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Active Transport, Cell Nucleus
Arabidopsis / enzymology*,  genetics,  radiation effects
Arabidopsis Proteins / genetics,  metabolism*
Cell Nucleus / enzymology,  genetics
Cell Shape
Circadian Clocks*
Cotyledon / metabolism,  radiation effects,  ultrastructure
Cryptochromes / genetics,  metabolism
Endoreduplication*
Genetic Complementation Test
Genetic Pleiotropy
Germination
Microscopy, Electron, Scanning
Monomeric GTP-Binding Proteins / genetics,  metabolism*
Photoreceptors, Plant / genetics,  metabolism
Phytochrome B / genetics,  metabolism
Ploidies
Recombinant Fusion Proteins / genetics,  metabolism
Salt-Tolerant Plants / enzymology,  genetics,  radiation effects
Sodium Chloride / pharmacology
Stress, Physiological*
Chemical
Reg. No./Substance:
0/Arabidopsis Proteins; 0/CRY1 protein, Arabidopsis; 0/Cryptochromes; 0/PHYB protein, Arabidopsis; 0/Photoreceptors, Plant; 0/Recombinant Fusion Proteins; 136250-22-1/Phytochrome B; 7647-14-5/Sodium Chloride; EC 3.6.5.2/LIP1 small GTPase, Arabidopsis; EC 3.6.5.2/Monomeric GTP-Binding Proteins
Comments/Corrections

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


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