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Further studies on phytoferritin.

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Phytoferritin inclusions in willow cambium plastids resist nucleases, suggesting they are not viral. These phytoferritin structures, resembling those in pea, exhibit an octahedral configuration of subunits.

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Area of Science:

  • Plant Cell Biology
  • Biochemistry
  • Structural Biology

Background:

  • Plastids in willow cambium, under dim light, contain crystalline and paracrystalline inclusions.
  • These inclusions were previously unidentified and their nature, potentially viral, was questioned.

Purpose of the Study:

  • To identify the nature of crystalline and paracrystalline inclusions in willow cambium plastids.
  • To investigate the structural characteristics and composition of these inclusions.
  • To differentiate these inclusions from viral particles.

Main Methods:

  • Electron microscopy was used to observe the inclusions in willow cambium plastids.
  • Nuclease treatments (deoxyribonuclease and ribonuclease) were applied to cambial cells.
  • Comparative structural analysis with phytoferritin from pea embryonic axes was performed.

Main Results:

  • Inclusions were identified as phytoferritin, unaffected by deoxyribonuclease or ribonuclease treatments.
  • Other cellular components were partially denatured by nucleases, supporting the exclusion of viral particles.
  • Phytoferritin from pea embryonic axes showed identical structure to the willow cambium inclusions.
  • These phytoferritin structures were rarely found in willows grown under high illumination.
  • Individual phytoferritin particles often comprised four, five, or six electron-opaque subunits.
  • An octahedral configuration with subunits at each vertex best explained the observed micellar arrangement.

Conclusions:

  • The nucleases-resistant inclusions in willow cambium plastids are phytoferritin, not viral particles.
  • Phytoferritin exhibits a consistent octahedral structure, composed of multiple electron-opaque subunits.
  • Environmental factors, such as light intensity, may influence phytoferritin occurrence in willow.