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PRESENCE OF LEUCOPLASTS IN SECRETORY CELLS AND OF MONOTERPENES IN THE ESSENTIAL OIL: A CORRELATIVE STUDY

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Analytical and structural studies were performed on 45 species of higher plants containing specialized secretory structures and/or producing essential oils or resins. Significant amounts of volatile compounds, mainly monoterpenes and sesquiterpenes, were recovered from these species. The specialized structures included glandular hairs, resin ducts, secretory cavities and idioblasts. During the ultrastructural investigation, special attention was paid to the plastidome. A number of secretory cells contain true leucoplasts, devoid of thylakoids and ribosomes. The comparison between analytical and structural data showed a very close correlation between the presence of leucoplasts in secretory cells and the significant quantities of monoterpenes (hydrocarbons or oxygenated compounds) in the volatile extract. Moreover, a morphometric estimation of leucoplast development in the cells suggested a quantitative relationship between the expansion of this plastidome and the ratio of monoterpenes in the oil. These data support the concept that leucoplasts are involved in monoterpene biosynthesis. On the other hand, no relationship exists between the occurrence of leucoplasts in the secretory cells and the presence of sesquiterpenes, phenylpropanoid or aliphatic compounds in the essential oil.

Affiliations: 1: Université de Bordeaux I, Laboratoire de Physiologie Cellulaire Végétale

10.1080/0021213X.1985.10677023
/content/journals/10.1080/0021213x.1985.10677023
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/content/journals/10.1080/0021213x.1985.10677023
1985-05-13
2018-09-25

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