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Alison Mello1, Idan Efroni2, Ramin Rahni1

  • 1Center for Genomics and Systems Biology, Department of Biology, New York University, 12 Waverly Place, New York, NY, 10003, USA.

The New Phytologist
|January 8, 2019
PubMed
Summary
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The Selaginella rhizophore, a unique plant organ, can develop into a root or shoot. Transcriptomic analysis reveals distinct gene expression, confirming it as a separate organ, not just a root or shoot precursor.

Area of Science:

  • Plant biology
  • Evolutionary botany
  • Developmental biology

Background:

  • Selaginella represents an early land plant lineage with roots and vasculature.
  • The rhizophore, a shoot-borne structure, is crucial for the Selaginella root system.
  • The organ identity of the rhizophore has been a subject of long-standing debate.

Purpose of the Study:

  • To investigate the organ identity of the Selaginella rhizophore.
  • To determine the developmental plasticity and commitment point of the rhizophore.
  • To analyze gene expression patterns during rhizophore development.

Main Methods:

  • Morphological analysis of rhizophore development.
  • Tracking developmental plasticity until commitment to root fate.
Keywords:
Selaginella moellendorffiiearly meristemlycophyte evolutionlycophyte rootsrhizophore

Related Experiment Videos

  • Transcriptomic analysis of rhizophore gene expression during the plastic stage.

    • Main Results:

    • Rhizophores exhibit plasticity, developing into roots or shoots until 8 days post-emergence.
    • Post-commitment, rhizophores are irreversibly determined to a root fate.
    • Rhizophore gene expression is distinct from both root and shoot meristems, despite some similarities to root meristems.

    Conclusions:

    • The rhizophore is a distinct organ with unique developmental and genetic characteristics.
    • It is not simply a precursor to a root or shoot but possesses its own identity.
    • This finding contributes to understanding early land plant evolution and organogenesis.