Abstract
Summary In non-mycorrhizal fine roots of Picea abies grown in hydroponic culture with controlled nutrient supply, apoplastic deposits of calcium oxalate were found microscopically (1) in outer cortical cells between the cell wall and the plasmalemma, and (2) in inner cortical cells within parts of the cell walls adjacent to intercellular spaces. The possible significance of these precipitations is discussed with regard to the transport of calcium, the synthesis of oxalic acid and the necessity to detoxify excess calcium.
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