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Glandular scale development and essential oil secretion in Origanum dictamnus L.

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Abstract

Glandular scales of Origanum dictamnus L. originate from a single protodermal cell. They are composed of a 12-celled head and an unicellular stalk and foot. During the early stages of gland differentiation, the head cells possess a small number of plastids which contain globular inclusions. Similar inclusions are also observed in the plastids of the stalk and the foot cell. The lateral walls of the stalk cell progressively undergo cutinization which does not extend to the upper and lower periclinal walls. At the onset of secretion the electron density of the plasmalemma region lining the apical walls of the head cells remarkably increases. These walls are impregnated with an osmiophilic substance identical in appearance to the content of the subcuticular space. In a following stage of the secretory process osmiophilic droplets of various size arise in the cytoplasm of the secretory cells which undergoes simultaneously a reduction of its initial density. After secretion has been concluded the protoplast of the head cells becomes gradually degenerated. The chlorenchyma cells of the mesophyll possess numerous microbodies closely associated with various organelles. In the cytoplasm of these cells crystalloids occasionally occur.

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  1. Botanical Institute, University of Thessaloniki, Thessaloniki, Greece

    A. Bosabalidis & I. Tsekos

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  1. A. Bosabalidis
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  2. I. Tsekos
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Bosabalidis, A., Tsekos, I. Glandular scale development and essential oil secretion in Origanum dictamnus L.. Planta 156, 496–504 (1982). https://doi.org/10.1007/BF00392771

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