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Phyllotaxis involves auxin drainage through leaf primordia.

Yamini Deb1, Dominik Marti2, Martin Frenz2

  • 1Institute of Plant Science, University of Bern, Bern 3013, Switzerland.

Development (Cambridge, England)
|May 9, 2015
PubMed
Summary
This summary is machine-generated.

The developing midvein in tomato plants aids in auxin transport, influencing leaf formation and spacing. Ablating the midvein temporarily disrupted phyllotaxis but the plant readjusted.

Keywords:
AuxinLaser ablationMeristemPIN1PatterningPhyllotaxisTomato

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Area of Science:

  • Plant biology
  • Developmental biology
  • Genetics

Background:

  • Phyllotaxis, the arrangement of leaves and flowers, is regulated by auxin.
  • Auxin transport via carriers like AUX1 and PIN1 is crucial, but their precise roles are unclear due to mutant phenotypes.
  • Models suggest auxin accumulation at leaf initials and removal via the midvein.

Purpose of the Study:

  • To investigate the role of the developing midvein in leaf formation and phyllotaxis.
  • To test the function of the midvein in auxin transport and organ spacing.

Main Methods:

  • Developed a microsurgical tool using femtosecond laser pulses for precise ablation of midvein tissues in young tomato leaf primordia.
  • Ablated internal tissues without damaging the L1 and L2 layers.

Main Results:

  • Midvein ablation caused transient auxin accumulation and increased primordia width.
  • Phyllotaxis was temporarily affected but recovered after two plastochrons.
  • Indicated the midvein's role in basipetal auxin transport.

Conclusions:

  • The developing midvein is essential for basipetal auxin transport in young primordia.
  • This transport contributes to phyllotactic spacing and pattern stability.
  • The study provides high-resolution insights into phyllotaxis mechanisms.