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Related Experiment Video

Updated: May 2, 2026

Shootward Movement of CFDA Tracer Loaded in the Bottom Sink Tissues of Arabidopsis
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[Ectodesmata and the peristomatal transpiration].

W Franke1

  • 1Institut für Landwirtschaftliche Botanik der Universität Bonn, Bonn, Deutschland.

Planta
|February 21, 2014
PubMed
Summary
This summary is machine-generated.

Ectodesmata, pores on plant epidermal cells, facilitate water vapor exhalation, particularly in peristomatal transpiration. These structures act as key exit points for water vapor from guard cells, influencing plant transpiration processes.

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Area of Science:

  • Plant physiology
  • Plant anatomy

Context:

  • Transpiration is crucial for plant survival and involves water vapor loss.
  • Epidermal transpiration includes cuticular and peristomatal transpiration.
  • Peristomatal transpiration involves water vapor exhalation through guard cells.

Purpose:

  • To investigate the role of ectodesmata in peristomatal transpiration.
  • To compare silver deposit patterns in radioautographs with ectodesmata distribution.
  • To determine if ectodesmata function as water vapor exit portals.

Summary:

  • Radioautographic analysis revealed silver deposits (indicating water vapor exhalation) over guard cells.
  • These sites of high blackening corresponded with numerous ectodesmata on epidermal walls.
  • In Zantedeschia aethiopica, silver grain patterns mirrored ectodesmata distribution, suggesting their role in water vapor exit.

Impact:

  • Provides strong evidence that ectodesmata act as portals for water vapor exit in guard cells.
  • Supports previous findings linking ectodesmata to cuticular excretion.
  • Offers insights into the functional significance of ectodesmata in plant transpiration.