Document Detail

Branching of the PIF3 regulatory network in Arabidopsis: roles of PIF3-regulated MIDAs in seedling development in the dark and in response to light.
MedLine Citation:
PMID:  22499182     Owner:  NLM     Status:  MEDLINE    
Plants need to accurately adjust their development after germination in the underground darkness to ensure survival of the seedling, both in the dark and in the light upon reaching the soil surface. Recent studies have established that the photoreceptors phytochromes and the bHLH phytochrome interacting factors PIFs regulate seedling development to adjust it to the prevailing light environment during post-germinative growth. However, complete understanding of the downstream regulatory network implementing these developmental responses is still lacking. In a recent work, published in The Plant Cell, we report a subset of PIF3-regulated genes in dark-grown seedlings that we have named MIDAs (MISREGULATED IN DARK). Analysis of their functional relevance using mutants showed that four of them present phenotypic alterations in the dark, and that each affected a particular facet of seedling development, suggesting organ-specific branching in the signal that PIF3 relays downstream. Furthermore, our results also showed an altered response to light in seedlings with an impaired PIF3/MIDA regulatory network, indicating that these factors might also be essential to initiate and optimize the developmental adjustment of the seedling to the light environment.
Maria Sentandreu; Pablo Leivar; Guiomar Martín; Elena Monte
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-04-01
Journal Detail:
Title:  Plant signaling & behavior     Volume:  7     ISSN:  1559-2324     ISO Abbreviation:  Plant Signal Behav     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-09-17     Completed Date:  2013-02-07     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  101291431     Medline TA:  Plant Signal Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  510-3     Citation Subset:  IM    
Departament de Genètica Molecular, Center for Research in Agricultural Genomics (CRAG) CSIC-IRTA-UAB-UB, Campus UAB, Bellaterra, Barcelona, Spain.
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MeSH Terms
Arabidopsis / genetics*,  radiation effects*
Arabidopsis Proteins / genetics,  metabolism*
Basic Helix-Loop-Helix Transcription Factors / genetics,  metabolism*
Gene Expression Regulation, Plant / radiation effects
Gene Regulatory Networks / genetics*
Organ Specificity / genetics
Seedling / genetics,  growth & development*,  radiation effects
Signal Transduction / genetics
Transcription, Genetic
Reg. No./Substance:
0/Arabidopsis Proteins; 0/Basic Helix-Loop-Helix Transcription Factors; 0/PIF3 protein, Arabidopsis

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