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Lateral Root Inducible System in Arabidopsis and Maize
09:23

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Published on: January 14, 2016

Auxin minimum defines a developmental window for lateral root initiation.

Joseph G Dubrovsky1, Selene Napsucialy-Mendivil1, Jérme Duclercq2,3

  • 1Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apartado Postal 510-3, 62250 Cuernavaca, Morelos, Mexico.

The New Phytologist
|May 17, 2011
PubMed
Summary
This summary is machine-generated.

Auxin gradients establish a specific developmental window for lateral root initiation. An auxin minimum zone is crucial for founder cell specification, ensuring steady root development.

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Area of Science:

  • Plant biology
  • Developmental biology
  • Molecular genetics

Background:

  • Root system architecture is critical for plant growth and relies on lateral root (LR) initiation.
  • LR initiation occurs within a specific developmental window (DW) influenced by hormonal signaling.
  • Understanding the precise mechanisms controlling LR initiation timing and location is essential for plant science.

Purpose of the Study:

  • To investigate the role of auxin gradients in defining the developmental window for lateral root initiation.
  • To analyze the spatiotemporal control of LR initiation in response to auxin distribution.
  • To elucidate the molecular mechanisms underlying auxin-mediated founder cell specification.

Main Methods:

  • Analysis of auxin distribution and response in Arabidopsis thaliana and Solanum lycopersicum roots.
  • Correlation studies between auxin levels and LR initiation sites.
  • Investigating the involvement of auxin perception (TIR1/AFB pathway) and polar auxin transport.

Main Results:

  • A distinct zone of minimal auxin content and response was identified, demarcating the DW for founder cell specification.
  • Pericycle cells within this auxin minimum zone showed the highest probability of becoming founder cells.
  • Auxin perception via TIR1/AFB and polar auxin transport were found to be essential for establishing this auxin minimum zone.

Conclusions:

  • Auxin acts as a dual-function molecule, triggering founder cell identity and signaling position through gradients.
  • The identified auxin minimum zone is a key regulatory mechanism for consistent and acropetal lateral root initiation.
  • This finding provides critical insights into the developmental plasticity of root system architecture.