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Auxin influx carriers stabilize phyllotactic patterning.

Katherine Bainbridge1, Soazig Guyomarc'h, Emmanuelle Bayer

  • 1Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland.

Genes & Development
|March 19, 2008
PubMed
Summary
This summary is machine-generated.

Plant hormone auxin transport is key to leaf arrangement (phyllotaxis). AUX and LAX transporters, alongside PIN1, regulate spacing, preventing abnormal primordia clustering and buffering against environmental changes.

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Area of Science:

  • Plant Biology
  • Developmental Biology
  • Genetics

Background:

  • Plant architecture features regular leaf and flower arrangement (phyllotaxis).
  • Auxin hormone peaks, mediated by PIN1 efflux carriers, instruct primordium initiation and spacing.
  • Previous research focused on PIN1-mediated auxin efflux, with limited attention to auxin uptake.

Purpose of the Study:

  • Investigate the role of AUX1 and its paralogs (LAX1, LAX2, LAX3) in phyllotactic patterning.
  • Determine the contribution of auxin influx carriers to plant development and architecture.
  • Elucidate the interplay between auxin influx and efflux in phyllotaxis.

Main Methods:

  • Analysis of a quadruple mutant lacking functional AUX1, LAX1, LAX2, and LAX3 genes.
  • Phenotypic characterization of plant architecture, focusing on primordia arrangement and divergence angles.
  • Molecular analysis of auxin levels and PIN polarization within the plant tissues.

Main Results:

  • The quadruple mutant exhibited irregular divergence angles between successive primordia.
  • Abnormal clustering of primordia was observed, deviating from classical phyllotactic models.
  • Reduced auxin peaks and disrupted PIN polarization were noted at the molecular level.
  • The phenotype showed increased severity under short-day conditions, indicating a buffering role.

Conclusions:

  • AUX and LAX auxin influx transporters are crucial for maintaining regular phyllotaxis.
  • These transporters work in concert with PIN1 to establish auxin peaks and coordinate patterning.
  • The AUX/LAX system buffers the PIN-mediated mechanism against environmental and developmental variations.