The development and morphology of secretory trichomes of Calceolaria volckmanni was examined with light and electron microscopy. The formation and development of the glandular trichomes began with the outgrowth of a single epidermal cell which progressively increased in height and evolved into a pear-shaped cell. Subsequent divisions generated a mature trichome formed by a basal cell, a stalk "endodermal" cell and an 8-celled glandular head. Histochemical tests revealed the lipophilic nature of the secretion, the presence of terpenes and flavonoids, and displayed a particular cutinization of the walls of the stalk cell. The observed ultrastructural features of the lipophilic glandular hairs suggested the function of plastids in the secretory process.
Development and morphology of secretory trichomes of Calceolaria volckmanni L. (Scrophulariaceae)
SACCHETTI, Gianni;BRUNI, Alessandro;DALL'OLIO, Giuseppe;
1996
Abstract
The development and morphology of secretory trichomes of Calceolaria volckmanni was examined with light and electron microscopy. The formation and development of the glandular trichomes began with the outgrowth of a single epidermal cell which progressively increased in height and evolved into a pear-shaped cell. Subsequent divisions generated a mature trichome formed by a basal cell, a stalk "endodermal" cell and an 8-celled glandular head. Histochemical tests revealed the lipophilic nature of the secretion, the presence of terpenes and flavonoids, and displayed a particular cutinization of the walls of the stalk cell. The observed ultrastructural features of the lipophilic glandular hairs suggested the function of plastids in the secretory process.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
