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Related Concept Videos

Morphogenesis02:19

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Updated: May 7, 2026

Confocal Live Imaging of Shoot Apical Meristems from Different Plant Species
06:46

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Published on: March 29, 2019

Interaction between meristem tissue layers controls phyllotaxis.

Daniel Kierzkowski1, Michael Lenhard, Richard Smith

  • 1Institute of Plant Sciences, University of Bern, Bern CH-3013, Switzerland.

Developmental Cell
|October 5, 2013
PubMed
Summary
This summary is machine-generated.

Plant phyllotaxis and vein formation rely on auxin transport. PIN1 expression in the L1 layer is sufficient for organ positioning, indicating inner tissue differentiation can occur independently of polar auxin transport.

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Area of Science:

  • Plant developmental biology
  • Molecular genetics
  • Biophysics

Background:

  • Phyllotaxis and vein formation are key plant patterning processes.
  • Auxin efflux carrier PIN1 expression and polarization are early markers for these processes.
  • Mathematical models suggest PIN1 responds to auxin gradients or flux.

Purpose of the Study:

  • To investigate the interplay between L1 layer phyllotactic patterning and inner tissue midvein specification.
  • To determine the role of PIN1 in these processes using cell-layer-specific knockouts.
  • To analyze auxin transport mechanisms in plant development.

Main Methods:

  • Utilized cell-layer-specific PIN1 knockouts.
  • Employed partial complementation of auxin transport mutants.
  • Examined phyllotactic patterning in the L1 meristem layer and midvein specification in inner tissues.

Main Results:

  • PIN1 expression in the L1 layer is sufficient for correct organ positioning when L1-specific influx carriers are present.
  • Inner tissue differentiation can proceed without PIN1 or known polar transporters.
  • Suggests facilitated diffusion, rather than polar transport, may canalize auxin flux.

Conclusions:

  • L1 layer PIN1 activity is crucial for organ positioning in plant development.
  • Inner tissue patterning is less dependent on polar auxin transport than previously thought.
  • Auxin flux canalization might involve facilitated diffusion mechanisms.