Aug 3, 2016

NUCLEAR FACTOR Y, subunit A (NF-YA) proteins positively regulate flowering and act through FLOWERING LOCUS T

BioRxiv : the Preprint Server for Biology
Chamindika SiriwardanaBen F Holt

Abstract

Photoperiod dependent flowering is one of several mechanisms used by plants to initiate the developmental transition from vegetative growth to reproductive growth. The NUCLEAR FACTOR Y (NF-Y) transcription factors are heterotrimeric complexes composed of NF-YA and histone-fold domain (HFD) containing NF-YB/NF-YC, that initiate photoperiod-dependent flowering by cooperatively interacting with CONSTANS (CO) to drive the expression of FLOWERING LOCUS T (FT). This involves NF-Y and CO binding at distal CCAAT and proximal CORE elements, respectively, in the FT promoter. While this is well established for the HFD subunits, there remains some question over the potential role of NF-YA as either positive or negative regulators of this process. Here we provide strong support, in the form of genetic and biochemical analyses, that NF-YA, in complex with NF-YB/NF-YC proteins, can directly bind the distal CCAAT box in the FT promoter and are positive regulators of flowering in an FT-dependent manner.

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Mentioned in this Paper

Nuclear Transcription Factor Y Subunit Alpha
Histone antigen
Nuclear factor Y
Complex (molecular entity)
Transcription, Genetic
Promoter
Developmental Vegetative Growth
Protein Subunits
CONSTANS protein, Arabidopsis
CCAAT-binding Factor Complex

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