Abstract
SummaryThe secretory trichomes from Artemisia crithmifolia present a biseriate multicellular structure. They originate from a single epidermal cell, belonging to the leaf or to the stem primordia. Histochemical tests reveal the lipophilic character of the secreted material corresponding probably to terpenoids.Young trichome cells possess the normal features of a secretory cell, namely a dense cytoplasm containing numerous mitochondria and plastids and few vacuoles. A large nucleus with one or more prominent nucleoli is also present.Modifications of plastids morphology and increase of ER profiles must be related to secretion. Osmiophilic droplets are seen in close relation with plastids and ER. Electron dense material has also been observed in small vacuoles, corresponding presumably to the storage of secretion.Secretory products are extruded and temporarily accumulated in the subcuticular space. Older trichomes undergo a lytic process followed by trichomes death.
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