By the same authors

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From the same journal

The GI-CDF module of Arabidopsis affects freezing tolerance and growth as well as flowering

Research output: Contribution to journalArticle

Published copy (DOI)

Author(s)

  • Fabio Fornara
  • Amaury de Montaigu
  • Alfredo Sánchez-Villarreal
  • Yasuyuki Takahashi
  • Emiel Ver Loren van Themaat
  • Bruno Huettel
  • Seth J Davis
  • George Coupland

Department/unit(s)

Publication details

JournalThe Plant journal
DateE-pub ahead of print - 24 Feb 2015
DatePublished (current) - Mar 2015
Issue number5
Volume81
Number of pages12
Pages (from-to)695-706
Early online date24/02/15
Original languageEnglish

Abstract

Plants monitor and integrate temperature, photoperiod and light quality signals to respond to continuous changes in their environment. The GIGANTEA (GI) protein is central in diverse signaling pathways, including photoperiodic, sugar and light signaling pathways, stress responses and circadian clock regulation. Previously, GI was shown to activate expression of the key floral regulators CONSTANS (CO) and FLOWERING LOCUS T (FT) by facilitating degradation of a family of CYCLING DOF FACTOR (CDF) transcriptional repressors. However, whether CDFs are implicated in other processes affected by GI remains unclear. We investigated the contribution of the GI-CDF module to traits that depend on GI. Transcriptome profiling indicated that mutations in GI and the CDF genes have antagonistic effects on expression of a wider set of genes than CO and FT, whilst other genes are regulated by GI independently of the CDFs. Detailed expression studies followed by phenotypic assays showed that the CDFs function downstream of GI, influencing responses to freezing temperatures and growth, but are not necessary for proper clock function. Thus GI-mediated regulation of CDFs contributes to several processes in addition to flowering, but is not implicated in all of the traits influenced by GI.

Bibliographical note

© 2015 The Authors The Plant Journal published by Society for Experimental Biology and John Wiley & Sons Ltd.

    Research areas

  • Arabidopsis, Arabidopsis Proteins, Circadian Clocks, Cotyledon, Flowers, Freezing, Gene Expression Profiling, Gene Expression Regulation, Plant, Hypocotyl, Light, Mutation, Oligonucleotide Array Sequence Analysis, Oxidative Stress, Phenotype, Photoperiod, Repressor Proteins, Signal Transduction, Transcription Factors

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