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Updated: Jan 31, 2026

Resurrection of Dormant Daphnia magna: Protocol and Applications
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A function for the pleurogram in physically dormant seeds.

Ailton G Rodrigues-Junior1,2, Ana Caroline M P Mello1, Carol C Baskin2,3

  • 1Departamento de Botânica, ICB, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.

Annals of Botany
|January 1, 2019
PubMed
Summary
This summary is machine-generated.

The pleurogram, a seed coat structure in legumes, functions as a water gap in some Senna species, facilitating germination. This study reveals its varied functionality and opening mechanism in seed water uptake.

Keywords:
SennaExtra-hilar water gapdormancy releasehilumlensmicropylephysical dormancypleurogram function

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Area of Science:

  • Plant anatomy
  • Seed biology
  • Legume research

Background:

  • Physical dormancy (PY) in seeds involves water gaps, often in the hilar region of Fabaceae.
  • The function of the pleurogram, an extra-hilar structure common in legume seeds, is largely unknown.

Purpose of the Study:

  • To review pleurogram occurrence in Fabaceae.
  • To determine if the pleurogram can open.
  • To compare the functional morpho-anatomy of water gaps in 11 Senna species.

Main Methods:

  • Imbibition tests to confirm physical dormancy (PY).
  • Light and scanning electron microscopy for structural analysis.
  • Dye-tracking to trace water pathways through the seed coat.

Main Results:

  • Pleurograms reported in 37 legume genera.
  • Water uptake occurred via pleurograms in some Senna species after PY release.
  • Pleurogram opening mechanisms varied: outward palisade layer movement or palisade layer breakage.

Conclusions:

  • The pleurogram functions as a water gap in certain Senna species, but not all.
  • Pleurogram opening involves slit formation in the palisade layer, enabling water entry.
  • This finding suggests the pleurogram may act as a water gap in numerous other legume species.