Universität zu Köln

Andres, Fernando ORCID: 0000-0003-4736-8876, Romera-Branchat, Maida ORCID: 0000-0002-6685-5066, Martinez-Gallegos, Rafael, Patel, Vipul, Schneeberger, Korbinian, Jang, Seonghoe, Altmueller, Janine, Nuernberg, Peter and Coupland, George ORCID: 0000-0001-6988-4172 (2015). Floral Induction in Arabidopsis by FLOWERING LOCUS T Requires Direct Repression of BLADE-ON-PETIOLE Genes by the Homeodomain Protein PENNYWISE. Plant Physiol., 169 (3). S. 2187 - 2200. ROCKVILLE: AMER SOC PLANT BIOLOGISTS. ISSN 1532-2548

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Abstract

Flowers form on the flanks of the shoot apical meristem (SAM) in response to environmental and endogenous cues. In Arabidopsis (Arabidopsis thaliana), the photoperiodic pathway acts through FLOWERING LOCUS T (FT) to promote floral induction in response to day length. A complex between FT and the basic leucine-zipper transcription factor FD is proposed to form in the SAM, leading to activation of APETALA1 and LEAFY and thereby promoting floral meristem identity. We identified mutations that suppress FT function and recovered a new allele of the homeodomain transcription factor PENNYWISE (PNY). Genetic and molecular analyses showed that ectopic expression of BLADE-ON-PETIOLE1 (BOP1) and BOP2, which encode transcriptional coactivators, in the SAM during vegetative development, confers the late flowering of pny mutants. In wild-type plants, BOP1 and BOP2 are expressed in lateral organs close to boundaries of the SAM, whereas in pny mutants, their expression occurs in the SAM. This ectopic expression lowers FD mRNA levels, reducing responsiveness to FT and impairing activation of APETALA1 and LEAFY. We show that PNY binds to the promoters of BOP1 and BOP2, repressing their transcription. These results demonstrate a direct role for PNY in defining the spatial expression patterns of boundary genes and the significance of this process for floral induction by FT.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Andres, Fernando UNSPECIFIED orcid.org/0000-0003-4736-8876 UNSPECIFIED Romera-Branchat, Maida UNSPECIFIED orcid.org/0000-0002-6685-5066 UNSPECIFIED Martinez-Gallegos, Rafael UNSPECIFIED UNSPECIFIED UNSPECIFIED Patel, Vipul UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneeberger, Korbinian UNSPECIFIED UNSPECIFIED UNSPECIFIED Jang, Seonghoe UNSPECIFIED UNSPECIFIED UNSPECIFIED Altmueller, Janine UNSPECIFIED UNSPECIFIED UNSPECIFIED Nuernberg, Peter UNSPECIFIED UNSPECIFIED UNSPECIFIED Coupland, George UNSPECIFIED orcid.org/0000-0001-6988-4172 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-389049
DOI:	10.1104/pp.15.00960
Journal or Publication Title:	Plant Physiol.
Volume:	169
Number:	3
Page Range:	S. 2187 - 2200
Date:	2015
Publisher:	AMER SOC PLANT BIOLOGISTS
Place of Publication:	ROCKVILLE
ISSN:	1532-2548
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SHORT VEGETATIVE PHASE; MERISTEM IDENTITY; HOMEOBOX GENES; POUND-FOOLISH; FT PROTEIN; TRANSCRIPTION FACTORS; CIRCADIAN CLOCK; LIGHT QUALITY; SEASONAL CUES; INTEGRATOR FT Multiple languages Plant Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38904