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LEAFY demonstrates functions in reproductive development of the gametophyte but not the sporophyte of the fern Ceratopteris richardii.

Development (Cambridge, England)·2026
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LEAFY demonstrates functions in reproductive development of the gametophyte but not the sporophyte of the fern Ceratopteris richardii.

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Florigen and antiflorigen gene expression correlates with reproductive state in a marine angiosperm, <i>Zostera marina</i>.

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Author Spotlight: Leaf Trait Analysis for Climate and Ecology Reconstruction in Modern and Ancient Plant Communities
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The evolution and development of LEAFY function.

Hannah McConnell1, Verónica S Di Stilio1

  • 1Department of Biology, University of Washington, Seattle, WA, USA.

Journal of Experimental Botany
|May 4, 2026
PubMed
Summary
This summary is machine-generated.

The transcription factor LEAFY (LFY) likely evolved its reproductive role in early land plants, not just flowers. This review suggests LFY

Keywords:
LEAFYco-optionevo-devogametophytemeristempioneer transcription factor

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Area of Science:

  • Evolutionary developmental biology
  • Plant molecular biology
  • Genetics and genomics

Background:

  • The transcription factor LEAFY (LFY) is canonically known for its role in floral meristem identity in angiosperms.
  • LFY homologs are conserved across all land plants, suggesting an ancestral function predating flowers.
  • Previous hypotheses proposed a broader, ancestral meristematic role for LFY, with reproductive functions acquired later.

Purpose of the Study:

  • To review evidence supporting an earlier origin of LFY's reproductive role in land plant evolution.
  • To investigate the co-option of LFY function from gametophytes to sporophytes during the evolution of diploid-dominant life cycles.
  • To examine LFY's mechanism of action and its implications for reconstructing its functional evolution.

Main Methods:

  • Literature review of studies on LFY orthologs in non-flowering plants.
  • Analysis of evidence regarding LFY's role in gametophyte development.
  • Examination of LFY's mechanism of action, including its classification as a pioneer transcription factor.

Main Results:

  • Evidence suggests LFY's reproductive role emerged earlier than previously thought, specifically in the gametophyte stage of haploid-dominant plants.
  • LFY function was subsequently co-opted to the sporophyte during the transition to diploid-dominant life cycles in land plants.
  • Recent insights highlight LFY as a pioneer transcription factor, influencing its functional evolution.

Conclusions:

  • The reproductive role of LEAFY (LFY) is ancient, originating in the gametophyte of early land plants.
  • LFY's function was adapted to the sporophyte as plant life cycles shifted towards diploid dominance.
  • Understanding LFY as a pioneer transcription factor provides crucial insights into its evolutionary trajectory.