Journal Article

Glandular Trichomes of Fagonia L. (Zygophyllaceae) Species: Structure, Development and Secreted Materials

ABRAHAM FAHN and CARMELA SHIMONY

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 77, issue 1, pages 25-34
Published in print January 1996 | ISSN: 0305-7364
Published online January 1996 | e-ISSN: 1095-8290 | DOI: https://dx.doi.org/10.1006/anbo.1996.0004
Glandular Trichomes of Fagonia L. (Zygophyllaceae) Species: Structure, Development and Secreted Materials

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  • Ecology and Conservation
  • Evolutionary Biology
  • Plant Sciences and Forestry

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The glandular trichomes ofFagoniaconsist of one secretory cell and a multicellular stalk, which develops by division, elongation and elevation of epidermal cells. The latter become seperated from the mesophyll and a subepidermal chamber is formed. The length of the stalk, which differs in the various species or varieties is determined by the number of cell divisions and /or the extent of cell elongation. Although the basic morphology and development of the trichomes of the species and varieties examined are similar, two types of mature trichomes can be distinguished: one occurs in the two examined varieties ofF. mollisand the second inF. glutinosaandF. arabica. The secretory cells of the second type possess a very thick wall and bear a porous cupule on their top. Histochemical tests revealed that the sticky substance secreted by the secretory cells contains mainly polysaccharides and lipophilic compounds. The secreted material exhibits autofluorescence. InF. mollisvar.hispidachanges in the amount and shape of the fluorescent material inside the secretory cell, during the course of development, have been observed. The contribution of the glandular trichomes inFagoniaspecies to survival in hot desert conditions is discussed.

Keywords: Fagonia; glandular trichomes; subepidermal chamber; secreted material; adaptation to desert conditions; stalk; fluorescence

Journal Article.  0 words. 

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

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