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The Fine Structure of the Stegmata in Calamus Axillaris during Maturation

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The maturation process of stegmata in the rattan palm Calamus axillaris Becc. was investigated by electron microscopy. Near the apical meristem immature stegmata contain a dense cytoplasm and a centrally located nucleus, but no silica-bodies. Their cell walls, as weIl as those of adjacent fibres, show primary wall-like characteristics. At the third and fourth internode, silica-bodies form within a vacuole of the still immature stegmata; the nucleus becomes displaced towards the parenchyma side of a stegma. Between the fifth and tenth internode, the stegma walls thicken, first at the cell corners adjacent to fibres with subsequent extension to the fibre side. This part of a stegma wall becomes extremely thick and finally envelopes nearly half of the now fully developed silica-body. Its parenchyma side, however, remains free from additional wall material. After completion of wall thickening, the cytoplasm of a stegma degenerates.


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