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Annals of Botany 81: 327-335, 1998
© 1998 Annals of Botany Company

The Ultrastructure of Glandular Trichomes ofPhillyrea latifoliaL. (Oleaceae) Leaves

ELISABETTA GRAVANO, CORRADO TANI, ANDREA BENNICI and RICCARDO GUCCI+,

Dipartimento di Coltivazione e Difesa delle Specie Legnose, Sezione Coltivazioni Arboree, Università di Pisa, Via del Borghetto 80, I-56124, Pisa, Italy Dipartimento di Biologia Vegetale—Laboratori di Botanica Agraria e Forestale, Università di Firenze, Piazzale delle Cascine 28, I-50144, Firenze, Italy

February 28, 1997 ; April 21, 1997 . October 23, 1997 .

The anatomy and ultrastructure of glandular trichomes at different developmental stages were investigated inPhillyrea latifoliaL. leaves by transmission electron microscopy and histochemical techniques. The trichome consisted of a multicellular secretory head, a unicellular stalk and a collecting cell surrounded by epidermal cells and spongy mesophyll cells. There were numerous plasmodesmata across the cell walls of trichome cells, and especially between the stalk cell and the collecting cell. The collecting cell and stalk cell contained few chloroplasts. Mitochondria, elements of the endoplasmic reticulum and small vacuoles were abundant in the secretory cells. Crystals were present in the secretory cells and the collecting cell, especially at the mature and senescent stages of trichome development. As the cuticle, which covered the secretory cells, did not show pores or perforations, it is proposed that secretion occurred by accumulation of products in subcuticular spaces followed by diffusion through the cuticle. Callose accumulation was observed between the stalk cell and the collecting cell of senescent trichomes, especially in salt-treated plants. Trichome ontogeny was accelerated in salt-treated plants.Copyright 1998 Annals of Botany Company

Cuticle;Phillyrea latifolia; secretion; transmission electron microscopy; trichome development.


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