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Annals of Botany 81: 557-565, 1998
© 1998 Annals of Botany Company

Ultrastructure and Secretion of the Secretory Cells of Two Species ofFagoniaL. (Zygophyllaceae)

ABRAHAM FAHN and CARMELA SHIMONY

Department of Botany, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel Israel Fiber Institute, P.O. Box 8001, Jerusalem, Israel

September 11, 1997 ; October 23, 1997 . January 5, 1998 .

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

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


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