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Glandular Trichomes of Calceolaria adscendens Lidl. (Scrophulariaceae): Histochemistry, Development and Ultrastructure

G. SACCHETTI, C. ROMAGNOLI, M. NICOLETTI, A. DI FABIO, A. BRUNI and F. POLI
Annals of Botany
Vol. 83, No. 1 (January 1999), pp. 87-92
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/42765895
Page Count: 6
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Glandular Trichomes of Calceolaria adscendens Lidl. (Scrophulariaceae): Histochemistry, Development and Ultrastructure
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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. volckmanni, 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.

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