Journal Article

FE Controls the Transcription of Downstream Flowering Regulators Through Two Distinct Mechanisms in Leaf Phloem Companion Cells

Mio Shibuta and Mitsutomo Abe

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 58, issue 11, pages 2017-2025
Published in print November 2017 | ISSN: 0032-0781
Published online September 2017 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pcx133
FE Controls the Transcription of Downstream Flowering Regulators Through Two Distinct Mechanisms in Leaf Phloem Companion Cells

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Abstract

In the facultative long-day plant Arabidopsis thaliana, FLOWERING LOCUS T (FT), encoding the mobile hormone florigen, plays an essential role in modulating the optimal timing of flowering to ensure reproductive success. Under inductive long-day conditions, the transcription of FT is activated by the CONSTANS (CO)/NUCLEAR FACTOR-Y (NF-Y) protein complex in leaf phloem companion cells. FT is transported to the shoot apical meristem through interaction with florigen transporters, such as SODIUM POTASSIUM ROOT DEFECTIVE 1 (NaKR1). Some regulators involved in photoperiod-dependent FT function have been reported previously; however, the molecular mechanism that coordinates FT protein synthesis and transport efficiently needs to be investigated. The present study examined the role of an Myb-related transcription factor, FE, in the activation of FT gene transcription and FT protein transport. Expression analysis using FE-inducible systems and chromatin immunoprecipitation assays showed that FE directly bound to the FT and NaKR1 promoters and activated the transcription of downstream target genes. FE failed to activate FT expression without CO function, whereas FE-mediated NaKR1 induction was not affected by CO function. Taken together, our data indicate that FE regulates the transcription of FT and florigen transporter genes via different mechanisms.

Keywords: Arabidopsis thaliana; FE; Flowering; FT transcription; FT transport; NaKR1 (SODIUM POTASSIUM ROOT DEFECTIVE 1)

Journal Article.  5886 words.  Illustrated.

Subjects: Molecular Biology and Genetics ; Biotechnology ; Biochemistry ; Bioinformatics and Computational Biology ; Molecular and Cell Biology ; Plant Sciences and Forestry ; Plant Physiology

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