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Mapping the Structure-Function Relationships of Disordered Oncogenic Transcription Factors Using Transcriptomic Analysis
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Divergent Functional Diversification Patterns in the SEP/AGL6/AP1 MADS-Box Transcription Factor Superclade.

Patrice Morel1, Pierre Chambrier1, Véronique Boltz1

  • 1Laboratoire Reproduction et Développement des Plantes, Université de Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRA, F-69342, Lyon, France.

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Summary

Petunia floral development involves SEPALLATA (SEP) and APETALA1 (AP1)/SQUAMOSA (SQUA) genes. Petunia SEP genes determine floral organ identity, while AP1/SQUA genes regulate inflorescence and floral meristem identity.

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Area of Science:

  • Plant Biology
  • Developmental Biology
  • Genetics

Background:

  • SEPALLATA (SEP) and APETALA1 (AP1)/SQUAMOSA (SQUA) MADS-box genes are crucial for floral development in Arabidopsis.
  • Understanding these gene functions in diverse species like petunia is essential for evolutionary insights.

Purpose of the Study:

  • To functionally characterize SEP/AGL6 and AP1/SQUA genes in petunia (Petunia × hybrida).
  • To compare floral gene functions between rosid (Arabidopsis) and asterid (petunia) species.

Main Methods:

  • Analysis of single and higher-order mutants in petunia.
  • Comparative genomics and functional characterization of MADS-box genes.

Main Results:

  • Petunia SEP orthologs, particularly FLORAL BINDING PROTEIN2 (FBP2), control floral organ identity and termination.
  • Petunia FBP9, FBP23, and FBP4 genes are vital for floral meristem identity.
  • Petunia AP1/SQUA genes are essential for inflorescence identity and act as repressors in the first floral whorl.

Conclusions:

  • Significant functional diversification exists between SEP/AGL6 and AP1/SQUA subfamilies in angiosperm evolution.
  • Petunia exhibits distinct roles for these MADS-box genes compared to Arabidopsis, highlighting evolutionary divergence.