Journal Article

Ultrastructure and Secretion of the Secretory Cells of Two Species of<b><i>Fagonia</i></b>L. (Zygophyllaceae)

ABRAHAM FAHN and CARMELA SHIMONY

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 81, issue 4, pages 557-565
Published in print April 1998 | ISSN: 0305-7364
Published online April 1998 | e-ISSN: 1095-8290 | DOI: https://dx.doi.org/10.1006/anbo.1998.0591
Ultrastructure and Secretion of the Secretory Cells of Two Species ofFagoniaL. (Zygophyllaceae)

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The ultrastructure and secretion of the secretory cells of the glandular trichomes ofFagonia mollisandF. glutinosawere studied. The most important finding of this study is that two species of the same genus produce the lipophilic component of the secretory material in completely different ways and at different sites within the cell. In the early stages of development of secretory cells ofF. mollis,numerous mitochondria, containing myelin-like structures, occur in the basal part of the cell. Above them, highly-elongate elements, which are suspected to develop from mitochondria with myelin-like structures, are present. These have been termed ‘modified mitochondria’. It is suggested that the myelin-like structures are precursors of the lipophilic material ofF. mollis.InF. glutinosa,the lipophilic material appears first in the plastids as plastoglobuli. Polysaccharides appear to be produced by dictyosomes in both species. Secretion of the secretory substance to the outside of the protoplast appears to be granulocrine.Copyright 1998 Annals of Botany Company

Keywords: Fagonia mollis,Fagonia glutinosa,glandular trichomes, secretory cell, mitochondria, modified mitochondria, plastids, dictyosomes, lipophilic material, myelin-like structures, polysaccharides

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Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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