Abstract
The ultrastructure of the mature sieve-tube element (SE) of Neottia nidus-avis shows no distinctive features. Conversely, companion cells (CC) possess a number of structural features, so far detected in this species, exclusively. One of these is the presence of leucoplasts with thylakoids as long lamellae located peripherally. The leucoplasts are invariably surrounded by the cisternae of endoplasmic reticulum, almost lacking ribosomes. Another feature is the presence of abundant agranular endoplasmic reticulum appearing as flat cisternae and tubules. The above ultrastructural features of companion cells are viewed in terms of possible involvement of these cells in hormonally regulated phloem transport in the mycorrhizal orchid.
Published Version
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