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Plant axillary meristems (AMs) are crucial for branching and organogenesis. Their initiation involves maintaining stem cell lineages and activating them through complex signaling networks, ensuring continuous plant growth and development.

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Area of Science:

  • Plant developmental biology
  • Stem cell biology
  • Meristem development

Background:

  • Stem cell lineages are vital in animal development and increasingly recognized in plants.
  • Specialized plant stem cell lineages include meristemoid mother cells, vascular cambium, and apical meristems.
  • Axillary meristems (AMs) initiate new growth axes and function similarly to shoot apical meristems (SAMs).

Purpose of the Study:

  • To summarize current understanding of axillary meristem (AM) establishment.
  • To focus on the maintenance and activation of leaf axil meristematic cell lineages.
  • To explore the signaling networks regulating AM formation.

Main Methods:

  • Review of recent literature on plant stem cell lineages and meristem initiation.
  • Analysis of signaling pathways involved in axillary meristem (AM) development.
  • Focus on phytohormonal, transcriptional, epigenetic, and mechanical regulation.

Main Results:

  • AM formation involves two key stages: maintaining meristematic cell lineage and activating it to form new stem cell niches.
  • AMs are derived from stem cell lineages exiting shoot apical meristems (SAMs).
  • The process is regulated by complex, spatially and temporally coordinated signaling networks.

Conclusions:

  • Axillary meristem (AM) establishment is a tightly regulated process essential for plant architecture.
  • Phytohormonal cascades, transcriptional regulation, epigenetic modifications, and mechanical signals orchestrate AM formation.
  • Understanding AMs provides insights into plant organogenesis and continuous growth.