Chemistry and morphology of epicuticular waxes from various organs of jojoba (simmondsia chinensis [link] schneider)

Abstract

The surface of leaves and seed coats of Jojoba is covered with similar amounts of epicuticular waxes per surface area. The composition of these waxes was analysed by chem ical methods, whereas their microscopic structures in situ were revealed by scanning electron microscopy. Differences in the chemical structure and com position of the complex mixtures cause differences in the morphological appearance of wax on the surface of both organs. The predominance of saturated and long chain components in leaf wax results in a crystalline wax layer on this organ. In contrast, the seed coat carries a cover of non-crystalline fluid consistency. The lower melting point of this wax mixture is caused by shorter chain and unsaturated com pounds predominating on this organ. © 1983, Walter de Gruyter. All rights reserved.