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Light Sheet Fluorescence Microscopy of Plant Roots Growing on the Surface of a Gel

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Florigen signaling.

Hiroyuki Tsuji¹, Ken-Ichiro Taoka¹

¹Laboratory of Plant Molecular Genetics, Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan.

|March 6, 2015

Summary

Florigen, a FLOWERING LOCUS T (FT) protein, signals flowering by forming a complex in the shoot meristem. This complex activates genes, controlling floral transition and plant development.

Area of Science:

Plant Biology
Molecular Genetics
Developmental Biology

Background:

Florigen is a key systemic signal regulating flowering time in plants.
The FLOWERING LOCUS T (FT) protein, a member of the PEBP family, is the molecular basis of florigen.
FT is synthesized in leaves and translocated to the shoot apical meristem to induce flowering.

Purpose of the Study:

To elucidate the molecular mechanism of florigen action.
To understand how FT interacts with other proteins to regulate floral transition.
To explore the role of FT in diverse plant functions and its regulation.

Main Methods:

Analysis of FT protein interactions within the shoot apical meristem.
Investigating the composition and function of the florigen activation complex (FAC).

Keywords:

14-3-3 Florigen Florigen activation complex Meristem Photoperiodic flowering

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Studying the photoperiodic control of FT expression and its regulatory networks.

Main Results:

FT forms the florigen activation complex (FAC) with 14-3-3 proteins and FD transcription factor.
FAC activates floral meristem identity genes, such as AP1, initiating the floral transition.
FT's surface regions are crucial for its transport and function, suggesting interaction with other factors.
FT expression is regulated by the conserved GIGANTEA-CONSTANS-FT module, with variations influencing flowering time.

Conclusions:

The FAC model provides a molecular framework for FT's role in flowering and other developmental processes.
FT's interactions and targets are adaptable, allowing for diverse functions beyond flowering.
Photoperiodic control via the GIGANTEA-CONSTANS-FT module explains natural variation in flowering time.