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Cation Penetration through Isolated Leaf Cuticles.

J C McFarlane1

  • 1National Environmental Research Center at Las Vegas, Las Vegas, Nevada 89114.

Plant Physiology
|May 1, 1974
PubMed
Summary
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Cation penetration through apricot leaf cuticles follows a specific order, with monovalent cations moving faster than divalent ones. Positively charged sites within the cuticle likely impede ion transport.

Area of Science:

  • Plant Biology
  • Biophysics
  • Materials Science

Background:

  • The plant cuticle is a crucial barrier regulating water and solute transport.
  • Understanding ion permeability is vital for plant physiology and agrochemical applications.

Purpose of the Study:

  • To quantify the penetration rates of various cations through isolated apricot (Prunus armeniaca L.) leaf cuticles.
  • To elucidate the mechanisms governing cation transport across the cuticular barrier.

Main Methods:

  • Utilized a flow-through diffusion cell to measure steady-state penetration rates of cations.
  • Determined permeability coefficient (k) and diffusion coefficient (D) for different ions.
  • Conducted cuticle titration and ion adsorption studies.

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Main Results:

  • Monovalent cations (Group IA) exhibited a lyotropic series: Cs+ >/= Rb+ > K+ > Na+ > Li+.
  • Divalent cations penetrated significantly slower than monovalent cations.
  • Penetration was diffusion-controlled, influenced by charge interactions within the cuticle.
  • Potassium (K+) and water (H2O) penetration rates were similar at pH > 9, but K+ transport decreased sharply at pH 5.5.

Conclusions:

  • The apricot cuticle acts as a selective barrier to cation transport.
  • Evidence suggests cuticular pores are lined with positively charged sites, likely proteinaceous, influencing ion permeability.
  • Charge interactions play a significant role in regulating ion diffusion through the plant cuticle.