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PMID: 22549837 Published · epublish English Journal Article Research Support, Non-U.S. Gov't

TEMPRANILLO genes link photoperiod and gibberellin pathways to control flowering in Arabidopsis.

Nature communications ·Vol. 3 ·2012-05-01 ·Pages 808

Osnato M, Castillejo C, Matías-Hernández L, Pelaz S

Abstract

In Arabidopsis, FLOWERING LOCUS T (FT) promotes flowering in response to long days in the photoperiod pathway, while signalling downstream gibberellin (GA) perception is critical for flowering under short days. Previously we have established that the TEMPRANILLO (TEM) genes have a pivotal role in the direct repression of FT. Here we show that TEM genes directly regulate the expression of the GA(4) biosynthetic genes GA 3-oxidase1 and 2 (GA3OX1 and GA3OX2). Plants overexpressing TEM genes resemble GA-deficient mutants, and conversely, TEM downregulation give rise to elongated hypocotyls perhaps as a result of an increase in GA content. We consistently find that TEM1 represses GA3OX1 and GA3OX2 by directly binding a regulatory region positioned in the first exon. Our results indicate that TEM genes seem to link the photoperiod and GA-dependent flowering pathways, controlling floral transition under inductive and non-inductive day lengths through the regulation of the floral integrators.

MeSH Terms
Arabidopsis/genetics,growth & development,metabolism,radiation effects Arabidopsis Proteins/genetics,metabolism Flowers/genetics,growth & development,metabolism,radiation effects Gene Expression Regulation, Developmental/radiation effects Gene Expression Regulation, Plant/radiation effects Gibberellins/metabolism Photoperiod Signal Transduction Transcription Factors/genetics,metabolism
Chemicals
Arabidopsis Proteins Gibberellins TEM1 protein, Arabidopsis Transcription Factors
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Osnato Michela
Centre for Research in Agricultural Genomics, CSIC-IRTA-UAB-UB, Molecular Genetics Department, Parc de Recerca UAB, Bellaterra (Cerdanyola del Vallés), 08193 Barcelona, Spain.
Castillejo Cristina
Matías-Hernández Luis
Pelaz Soraya
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Article Info
Journal
Nature communications
Abbr.
Nat Commun
ISSN
2041-1723
DOI
10.1038/ncomms1810
Published
2012-05-01
Epub
2012-00-01
Pages
808
Language
English
Region
England
NLM ID
101528555
Subset
IM
External Links
PubMed source DOI: 10.1038/ncomms1810 View journal details
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