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Observations on albuminous cells in Pinus.

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Albuminous cells in pine trees (Pinus species) are best identified by their connections to sieve cells. Young albuminous cells contain transient slime bodies, and may store starch.

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Area of Science:

  • Plant anatomy
  • Wood science
  • Conifer biology

Background:

  • Albuminous cells are specialized parenchyma cells in secondary phloem.
  • Their identification and function in conifers, particularly pines, require clarification.

Purpose of the Study:

  • To identify reliable criteria for distinguishing albuminous cells in Pinus species.
  • To investigate the presence and behavior of cellular inclusions within albuminous cells.

Main Methods:

  • Seasonal collection of secondary phloem from Pinus banksiana, P. resinosa, and P. strobus.
  • Microscopic examination focusing on cellular morphology and connections.
  • Protein-specific staining to identify cellular components.

Main Results:

  • Conspicuous connections with sieve cells were identified as the sole reliable criterion for albuminous cell identification.
  • Discrete, protein-reactive bodies (slime bodies) were observed in young albuminous cells, elongating and disappearing over time.
  • Albuminous cells can accumulate starch, particularly during periods of high starch content in other phloem parenchyma.

Conclusions:

  • Cellular connections to sieve cells are definitive for identifying albuminous cells in these pine species.
  • Slime bodies represent a dynamic feature of developing albuminous cells.
  • Albuminous cells exhibit physiological plasticity, including starch storage, similar to other phloem parenchyma.