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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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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.
Annals of Botany © 1999 Oxford University Press