Document Detail

Gene profiling of the red light signalling pathways in roots.
MedLine Citation:
PMID:  16908503     Owner:  NLM     Status:  MEDLINE    
Red light, acting through the phytochromes, controls numerous aspects of plant development. Many of the signal transduction elements downstream of the phytochromes have been identified in the aerial portions of the plant; however, very few elements in red-light signalling have been identified specifically for roots. Gene profiling studies using microarrays and quantitative Real-Time PCR were performed to characterize gene expression changes in roots of Arabidopsis seedlings exposed to 1 h of red light. Several factors acting downstream of phytochromes in red-light signalling in roots were identified. Some of the genes found to be differentially expressed in this study have already been characterized in the red-light-signalling pathway for whole plants. For example, PHYTOCHROME KINASE 1 (PKS1), LONG HYPOCOTYL 5 (HY5), EARLY FLOWERING 4 (ELF4), and GIGANTEA (GI) were all significantly up-regulated in roots of seedlings exposed to 1 h of red light. The up-regulation of SUPPRESSOR OF PHYTOCHROME A RESPONSES 1 (SPA1) and CONSTITUTIVE PHOTOMORPHOGENIC 1-like (COP1-like) genes suggests that the PHYA-mediated pathway was attenuated by red light. In addition, genes involved in lateral root and root hair formation, root plastid development, phenylpropanoid metabolism, and hormone signalling were also regulated by exposure to red light. Interestingly, members of the RPT2/NPH3 (ROOT PHOTOTROPIC 2/NON PHOTOTROPIC HYPOCOTYL 3) family, which have been shown to mediate blue-light-induced phototropism, were also differentially regulated in roots in red light. Therefore, these results suggest that red and blue light pathways interact in roots of seedlings and that many elements involved in red-light-signalling found in the aerial portions of the plant are differentially expressed in roots within 1 h of red light exposure.
Maria Lia Molas; John Z Kiss; Melanie J Correll
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2006-08-14
Journal Detail:
Title:  Journal of experimental botany     Volume:  57     ISSN:  0022-0957     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2006  
Date Detail:
Created Date:  2006-09-18     Completed Date:  2006-12-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  3217-29     Citation Subset:  IM    
Department of Botany, Miami University, Oxford, OH 45056, USA.
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MeSH Terms
ATP-Binding Cassette Transporters / genetics,  metabolism
Arabidopsis / genetics*,  metabolism,  radiation effects
Arabidopsis Proteins / genetics,  metabolism*
Chloroplasts / genetics,  metabolism
Gene Expression Profiling
Gene Expression Regulation, Plant / radiation effects*
Models, Biological
Oligonucleotide Array Sequence Analysis
Phenylalanine / metabolism
Phytochrome B / genetics,  metabolism
Plant Roots / genetics,  metabolism,  radiation effects
Plastids / genetics,  metabolism
Polymerase Chain Reaction
Signal Transduction / genetics*
Reg. No./Substance:
0/ATP-Binding Cassette Transporters; 0/Arabidopsis Proteins; 136250-22-1/Phytochrome B; 63-91-2/Phenylalanine

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