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Related Experiment Videos

Solute sorting in grass leaves: the transpiration stream.

Wieland Fricke1

  • 1Division of Biological Sciences, University of Paisley, PA1 2BE, UK. fric-bs0@wpmail.paisley.ac.uk

Planta
|April 16, 2004
PubMed
Summary

Transpiration influences solute distribution in barley leaves, with higher concentrations in epidermal cells near stomata. This process is crucial for solute accumulation, especially calcium, in these specialized cells.

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Area of Science:

  • Plant Physiology
  • Plant Anatomy
  • Biochemistry

Background:

  • Solute distribution varies between plant leaf tissues and cells.
  • The role of transpiration in preferential solute supply to the epidermis is not fully understood.

Purpose of the Study:

  • To test the hypothesis that solutes are preferentially supplied to the epidermis via the transpiration stream.
  • To investigate solute distribution in transpiring and non-transpiring barley leaf zones.

Main Methods:

  • Energy dispersive X-ray analysis of extracted cell sap.
  • Comparative study of solute distribution in emerged (transpiring) and elongation (non-transpiring) zones of barley leaves.

Main Results:

  • Basic solute distribution (Cl, K, P, Ca) was similar in both leaf zones.
  • Solute concentration differences between tissues and cells were greater in the emerged zone.
  • Reduced transpiration prevented high calcium accumulation in epidermal cells near stomata.

Conclusions:

  • Differential solute concentrations between epidermal cells and other leaf tissues can occur without transpiration.
  • Transpiration is required for the full expression of these solute concentration differences.
  • Peristomatal transpiration drives high calcium levels in interstomatal cells.

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