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Summary

A structural study of pre-emergence growth stages of potato sprouts is described. Dormant cells contain concentric endoplasmic reticulum. No differences are to be found in the palisade-like epidermal cells of sprouts at different growth stages. The cells are filled with ribosomes and contain an abundance of other organelles. The thickish outer wall is covered by a thin electron-dense cuticle.

Necrotic epidermal and subepidermal cells were frequently observed. The walls of such cells appear to have decomposed, followed by extrusion to the plant surface of disintegrating cytoplasm that spreads over large areas. The type of necrosis investigated here is believed to be identical to one due to calcium deficiency, described by several previous authors. Its possible pathological aspects are briefly discussed.