Ultrastructural aspects of the osmophores on the adaxial face of the sepals of Acianthera prolifera flowers 48 h after the beginning of anthesis. a General view of an epidermal cell of the osmophore; notice the high-density cytoplasm and large numbers of organelles. b Detail of an epidermal cell of the osmophore showing plastids with dense stroma and osmiophilic inclusions; notice hydrolyzed starch grains that have an amorphous outline in the interior of the plastid. c, d Detail of the cells of the subepidermal tissue showing plastids with translucent stroma resulting from starch hydrolysis; notice in d the high density of mitochondria and the well-developed endoplasmic reticulum (mi mitochondria, pl plastid, re endoplasmic reticulum, va vacuole)
The cytoplasm of the epidermal cells, on the adaxial face of the
sepals, is organelle-rich (Fig. 5) and has lobed nuclei and
The cell membrane is sinuous, forming a conspicuous periplasmatic
space, with no signs of secretions accumulating here
Among the organelles in these epidermal cells, plastids and
mitochondria with well-developed cristae are the most abundant
(Fig. 5a, b).
Many of the plastids are polymorphic, although globose forms
predominate; the stroma is dense and there are many osmiophilic
inclusions (Fig. 5a, b).
A large part of the plastid stroma is occupied by starch that
appears to be partially hydrolyzed; it has an amorphous aspect
Free ribosomes and rough endoplasmic reticulum can be seen in the
cytoplasm of the epidermal cells (Fig. 5d).
Mesophyll cells of the adaxial faces of the sepals show
ultrastructural characteristics similar to those seen in the
epidermal layer (Fig. 5c, d).
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