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Related Experiment Videos

The transportable auxin pool.

R K de la Fuente1, A C Leopold

  • 1Horticulture Department, Purdue University, Lafayette, Indiana 47907.

Plant Physiology
|January 1, 1970
PubMed
Summary
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Auxin transport in sunflower stems is limited by the amount of available auxin and transport sites. These factors influence auxin transport gradients and plant tropistic responses.

Area of Science:

  • Plant Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • Auxin is a key plant hormone regulating growth and development.
  • Understanding auxin transport mechanisms is crucial for plant science.

Purpose of the Study:

  • To investigate the factors limiting auxin transport in sunflower seedlings.
  • To elucidate the roles of transportable auxin pool size and transport sites in auxin transport.

Main Methods:

  • Experiments using stem sections of sunflower seedlings.
  • Analysis of auxin transport capacity over varying stem lengths and auxin contents.
  • Assessment of auxin transport pulse decline over time and after pretreatment with auxin.

Main Results:

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  • Auxin transport capacity declines with stem section aging and rapidly after auxin uptake.
  • Pretreatment with auxin can inhibit or promote transport depending on tissue auxin levels.
  • Steady-state transport is maintained across different stem lengths and auxin concentrations.

Conclusions:

  • Auxin transport is constrained by both the pool size of transportable auxin and the availability of transport sites.
  • These limitations are significant in establishing auxin transport gradients and tropistic responses in plants.