The FT/TFL1 Regulatory Module: A Synthesis of Gene Duplication, Functional Divergence, and Environmental Modulation...

Area of Science:

• Plant Biology
• Genetics
• Evolutionary Biology

Background:

• The FLOWERING LOCUS T/TERMINAL FLOWER 1 (FT/TFL1) gene family, part of the PEBP superfamily, is crucial for regulating flowering time and inflorescence architecture.
• While FT generally promotes flowering and TFL1 delays it, creating an antagonistic balance, this simple model is insufficient to explain the complexity of expanded FT/TFL1 families across species and conditions.

Purpose of the Study:

• To synthesize current knowledge on FT/TFL1 gene family evolution, functional diversification, and environmental regulation.
• To provide a unified framework for understanding the evolutionary and environmental factors shaping FT/TFL1 function.
• To offer theoretical guidance for future research in plant reproductive development and trait manipulation.

Main Methods:

• Comparative genomics to analyze FT/TFL1 copy-number variation and expansion patterns across plant evolution.
• Molecular studies to investigate mechanisms of functional diversification within the FT/TFL1 gene family.
• Integration of insights from protein-protein interactions and environmental signal integration.

Main Results:

• FT/TFL1 gene families exhibit significant copy-number variation and expansion during plant evolution.
• Functional divergence among FT/TFL1 members is substantial, challenging the simple activator/repressor model.
• Protein interaction networks and environmental signals play key roles in modulating FT/TFL1 activity.

Conclusions:

• The classical FT activator/TFL1 repressor paradigm is an oversimplification of FT/TFL1 gene family functions.
• A unified framework integrating evolutionary, functional, and environmental aspects is necessary for a comprehensive understanding of FT/TFL1.
• This review provides a foundation for future studies on plant reproductive strategies, adaptation, and crop improvement through flowering time manipulation.