This paper reports the results of a study of the morphology and development of glandular trichomes in leaves of Calceolaria adscendens Lidl. using light and electron microscopy. Secretory trichomes started as outgrowths of epidermal cells ; subsequent divisions gave rise to trichomes made up of a basal epidermal cell, a stalk cell and a twocelled secretory head. Ultrastructural characteristics of trichome cells were typical of terpene-producing structures. Previous phytochemical studies had revealed that C. adscendens produces diterpenes. Comparison with C. v olckmanni, which produces triterpenes, and has trichomes with eight-celled secretory heads, suggests that there could be a relationship between the type of glandular trichome and the class of terpene produced. Further work is needed to test the hypothesis and to develop trichome characters as taxonomic tools.

Glandular trichomes of Calceolaria adscendens Lidl. (Scrophulariaceae): histochemistry, development and ultrastructure

SACCHETTI, Gianni;BRUNI, Alessandro;
1999

Abstract

This paper reports the results of a study of the morphology and development of glandular trichomes in leaves of Calceolaria adscendens Lidl. using light and electron microscopy. Secretory trichomes started as outgrowths of epidermal cells ; subsequent divisions gave rise to trichomes made up of a basal epidermal cell, a stalk cell and a twocelled secretory head. Ultrastructural characteristics of trichome cells were typical of terpene-producing structures. Previous phytochemical studies had revealed that C. adscendens produces diterpenes. Comparison with C. v olckmanni, which produces triterpenes, and has trichomes with eight-celled secretory heads, suggests that there could be a relationship between the type of glandular trichome and the class of terpene produced. Further work is needed to test the hypothesis and to develop trichome characters as taxonomic tools.
1999
Sacchetti, Gianni; Romagnoli, C.; Nicoletti, M.; DI FABIO, A.; Bruni, Alessandro; Poli, F.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1197751
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