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PLoS One. 2013;8(1):e53924. doi: 10.1371/journal.pone.0053924. Epub 2013 Jan 11.

Mediator subunit18 controls flowering time and floral organ identity in Arabidopsis.

Author information

1
Department of Biology, University of Florida, Gainesville, Florida, United States of America. patrickz@ufl.edu

Abstract

Mediator is a conserved multi-protein complex that plays an important role in regulating transcription by mediating interactions between transcriptional activator proteins and RNA polymerase II. Much evidence exists that Mediator plays a constitutive role in the transcription of all genes transcribed by RNA polymerase II. However, evidence is mounting that specific Mediator subunits may control the developmental regulation of specific subsets of RNA polymerase II-dependent genes. Although the Mediator complex has been extensively studied in yeast and mammals, only a few reports on Mediator function in flowering time control of plants, little is known about Mediator function in floral organ identity. Here we show that in Arabidopsis thaliana, MEDIATOR SUBUNIT 18 (MED18) affects flowering time and floral organ formation through FLOWERING LOCUS C (FLC) and AGAMOUS (AG). A MED18 loss-of-function mutant showed a remarkable syndrome of later flowering and altered floral organ number. We show that FLC and AG mRNA levels and AG expression patterns are altered in the mutant. Our results support parallels between the regulation of FLC and AG and demonstrate a developmental role for Mediator in plants.

PMID:
23326539
PMCID:
PMC3543355
DOI:
10.1371/journal.pone.0053924
[Indexed for MEDLINE]
Free PMC Article

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