Document Detail

Light, the circadian clock, and sugar perception in the control of lignin biosynthesis.
MedLine Citation:
PMID:  15878986     Owner:  NLM     Status:  MEDLINE    
Experiments were undertaken to investigate some of the mechanisms that may function to regulate lignin biosynthesis (lignification) in Arabidopsis thaliana. Northern blot analyses revealed that several genes encoding enzymes involved in the synthesis of lignin monomers displayed significant changes in transcript abundance over a diurnal cycle. Northern blot analysis also suggested that some of the changes in diurnal transcript abundance were likely to be attributable to circadian regulation, whereas others were likely to be attributable to light perception. Comparison of circadian changes in transcript abundance of lignin biosynthetic genes between wild-type plants and the sex1 mutant, which is impaired in starch turnover, suggested that carbon availability related to starch turnover might determine the capacity to synthesize lignins. This hypothesis was supported by the observation that the sex1 mutant accumulated fewer lignins than wild-type plants. Consistent with the relationship between carbon availability and lignin accumulation, analysis of dark-grown wild-type A. thaliana seedlings uncovered a role for sugars in the regulation of lignin biosynthesis. Analysis of lignin accumulation, as determined by qualitative changes in phloroglucinol staining, suggested that metabolizable sugars positively influence the abundance of lignins. Transcriptome analysis supports the hypothesis that sugars are not merely a source of carbon skeletons for lignification, but they also function as a signal to enhance the capacity to synthesize lignins.
Louisa A Rogers; Christian Dubos; Ian F Cullis; Christine Surman; Mervin Poole; Janet Willment; Shawn D Mansfield; Malcolm M Campbell
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-05-05
Journal Detail:
Title:  Journal of experimental botany     Volume:  56     ISSN:  0022-0957     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-05-18     Completed Date:  2005-07-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  1651-63     Citation Subset:  IM    
Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK.
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MeSH Terms
Arabidopsis / genetics,  metabolism*
Arabidopsis Proteins / metabolism
Carbohydrates / physiology*
Circadian Rhythm*
Gene Expression Profiling
Gene Expression Regulation, Plant
Hypocotyl / ultrastructure
Lignin / biosynthesis*,  chemistry
Models, Chemical
Plant Leaves / metabolism
Reg. No./Substance:
0/Arabidopsis Proteins; 0/Carbohydrates; 9005-53-2/Lignin

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