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Published on: December 1, 2015
EMF genes maintain vegetative development by repressing the flower program in Arabidopsis
Yong-Hwan Moon1, Lingjing Chen, Rong Long Pan
1Department of Plant and Microbial Biology, University of California, Berkeley, California 94720, USA.
The Plant Cell
|March 5, 2003
Summary
Embryonic Flower (EMF) genes EMF1 and EMF2 repress flower development, maintaining vegetative growth. EMF mutants prematurely activate floral genes, indicating EMF genes control the switch to reproductive fate.
Area of Science:
- Plant Molecular Biology
- Developmental Genetics
- Gene Regulation
Background:
- The EMBRYONIC FLOWER (EMF) genes, EMF1 and EMF2, are crucial for maintaining vegetative development and suppressing premature flowering.
- EMF1 functions as a transcriptional regulator, while EMF2 is a homolog of Polycomb group proteins, suggesting complex regulatory roles.
Purpose of the Study:
- To investigate the gene expression profiles of emf mutants using GeneChip technology.
- To elucidate the mechanism by which EMF genes repress floral organ development and maintain vegetative growth.
Main Methods:
- Gene expression profiling of emf1 and emf2 mutants compared to wild-type plants using GeneChip technology.
- Analysis of ectopic expression of floral organ genes in emf seedlings.
- Investigation of the regulatory relationship between EMF1 and key flowering time genes (CO, FT, LFY, etc.).
Main Results:
- emf1 and emf2 mutants exhibit highly overlapping expression changes, confirming their functional similarity.
- Germinating emf seedlings display expression profiles resembling Arabidopsis flowers and ectopically express floral organ genes.
- EMF1 does not appear to directly regulate key flowering genes like CONSTANS (CO), FLOWERING LOCUS T (FT), or LEAFY (LFY).
Conclusions:
- EMF genes repress the floral developmental program, ensuring vegetative growth.
- The repression mechanism mediated by EMF genes is independent of major flowering time pathways (CO, FT, LFY).
- A novel mechanism for EMF-mediated floral repression is proposed, highlighting the distinct role of EMF genes in plant development.
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