Document Detail

A light-regulated genetic module was recruited to carpel development in Arabidopsis following a structural change to SPATULA.
MedLine Citation:
PMID:  22851763     Owner:  NLM     Status:  MEDLINE    
A key innovation of flowering plants is the female reproductive organ, the carpel. Here, we show that a mechanism that regulates carpel margin development in the model flowering plant Arabidopsis thaliana was recruited from light-regulated processes. This recruitment followed the loss from the basic helix-loop-helix transcription factor SPATULA (SPT) of a domain previously responsible for its negative regulation by phytochrome. We propose that the loss of this domain was a prerequisite for the light-independent expression in female reproductive tissues of a genetic module that also promotes shade avoidance responses in vegetative organs. Striking evidence for this proposition is provided by the restoration of wild-type carpel development to spt mutants by low red/far-red light ratios, simulating vegetation shade, which we show to occur via phytochrome B, PHYTOCHROME INTERACTING FACTOR4 (PIF4), and PIF5. Our data illustrate the potential of modular evolutionary events to generate rapid morphological change and thereby provide a molecular basis for neo-Darwinian theories that describe this nongradualist phenomenon. Furthermore, the effects shown here of light quality perception on carpel development lead us to speculate on the potential role of light-regulated mechanisms in plant organs that, like the carpel, form within the shade of surrounding tissues.
Mathieu C Reymond; Géraldine Brunoud; Aurélie Chauvet; Jaime F Martínez-Garcia; Marie-Laure Martin-Magniette; Françoise Monéger; Charles P Scutt
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-07-31
Journal Detail:
Title:  The Plant cell     Volume:  24     ISSN:  1532-298X     ISO Abbreviation:  Plant Cell     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-08-24     Completed Date:  2013-02-14     Revised Date:  2013-07-12    
Medline Journal Info:
Nlm Unique ID:  9208688     Medline TA:  Plant Cell     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2812-25     Citation Subset:  IM    
Laboratoire de Reproduction et Développement des Plantes (Unité Mixte de Recherche 5667, Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique-Université de Lyon), Ecole Normale Supérieure de Lyon, 69364 Lyon cedex 07, France.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/HE610412; GEO/GSE12913
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MeSH Terms
Amino Acid Sequence
Arabidopsis / cytology,  genetics*,  growth & development,  radiation effects
Arabidopsis Proteins / genetics*,  metabolism
Base Sequence
Basic Helix-Loop-Helix Transcription Factors / genetics*,  metabolism
Evolution, Molecular
Flowers / cytology,  genetics*,  growth & development,  radiation effects
Gene Expression Regulation, Developmental / genetics*
Gene Expression Regulation, Plant / genetics
Models, Molecular
Molecular Sequence Data
Nucleotide Motifs / genetics
Phytochrome B / genetics
Plants, Genetically Modified
Promoter Regions, Genetic
Protein Structure, Tertiary / genetics
Sequence Analysis, DNA
Reg. No./Substance:
0/Arabidopsis Proteins; 0/Basic Helix-Loop-Helix Transcription Factors; 0/PIF4 protein, Arabidopsis; 0/PIF5 protein, Arabidopsis; 0/SPT protein, Arabidopsis; 136250-22-1/Phytochrome B

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