SECRETORY STRUCTURES AND ESSENTIAL OIL COMPOSITION OF SELECTED INDUSTRIAL SPECIES OF LAMIACEAE
Radosław Kowalski
Department of Analysis and Evaluation of Food Quality, University of Life Sciences in Lublin, Skromna 8, 20-704 Lublin, PolandGrażyna Kowalska
Department of Tourism and Recreation, University of Life Sciences in Lublin, Akademicka 15, 20-950 Lublin, PolandMonika Jankowska
Department of Chemistry, University of Life Sciences in Lublin, Akademicka 15, 20-950 Lublin, PolandAgnieszka Nawrocka
Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, PolandKlaudia Kałwa
Department of Analysis and Evaluation of Food Quality, University of Life Sciences in Lublin, Skromna 8, 20-704 Lublin, PolandUrszula Pankiewicz
Department of Analysis and Evaluation of Food Quality, University of Life Sciences in Lublin, Skromna 8, 20-704 Lublin, PolandMarzena Włodarczyk-Stasiak
Department of Analysis and Evaluation of Food Quality, University of Life Sciences in Lublin, Skromna 8, 20-704 Lublin, PolandAbstract
The objective of the study was to perform micromorphological analyses of the secretory structures of leaves and stems of oil-bearing industrial plants from the Lamiaceae family such as lemon balm (Melissa officinalis L.), peppermint (Mentha × piperita L.), sage (Salvia officinalis L.), marjoram (Origanum majorana L., syn. Origanum dubium Boiss.), rosemary (Rosmarinus officinalis L.) and common thyme (Thymus vulgaris L.) using light microscope and scanning electron microscope. In addition, an estimation of the content of volatile substances in the plant species under study was performed using GC-MS, as well as the qualitative and quantitative analysis of essential oil, that is an important component in terms of the estimation of raw material applicability for use in the industry. In the epidermal cells of studied plants, 2 types of Lamiaceae-type glandular trichomes were identified: short- and long-stalked capitate glandular trichomes with single- and bicellular secretory capitulum, and peltate glandular trichomes with eight- and over a dozen-cell secretory capitulum. Capitate trichomes were densely distributed on the surface of the epidermis, while peltate trichomes were sparse, though regular, and were situated in depressions. Glandular trichomes were found more frequently on leaves than on stems. The cuticle of the abaxial of leaf was characterized in most cases by the occurrence of larger average diameter peltate trichomes compared to the cuticle of the adaxial side of leaf. Peppermint produced the largest structures accumulating essential oil on the leaves (average diameter of peltate trichomes – 78.48 µm on the adaxial side of leaf, up to 96.43 µm), while on the stem, the highest average diameter of the peltate trichomes was observed in sage (an average of 75.53 µm, up to 85.99 µm). The lemon balm was characterized by the presence of capitate and peltate trichomes with the smallest diameter (an average of 44.26 µm). Lemon balm was characterized by the greatest density of glandular trichomes compared to other plant species. Among the plants studied, the highest content of oil was noted in the case of thyme and peppermint (2.22% and 2.20% v/w, respectively), and the lowest in green parts of lemon balm (0.17% v/w). The isolated essential oils contained predominantly components from the groups of monoterpenes and sesquiterpenes, and it is the presence of those substances that determines the possibility of utilizing the plants studied for a variety of purposes.
Keywords:
micromorphological analyses, trichomes, Lamiaceae, essentials oilReferences
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Department of Analysis and Evaluation of Food Quality, University of Life Sciences in Lublin, Skromna 8, 20-704 Lublin, Poland
Department of Tourism and Recreation, University of Life Sciences in Lublin, Akademicka 15, 20-950 Lublin, Poland
Department of Chemistry, University of Life Sciences in Lublin, Akademicka 15, 20-950 Lublin, Poland
Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
Department of Analysis and Evaluation of Food Quality, University of Life Sciences in Lublin, Skromna 8, 20-704 Lublin, Poland
Department of Analysis and Evaluation of Food Quality, University of Life Sciences in Lublin, Skromna 8, 20-704 Lublin, Poland
Department of Analysis and Evaluation of Food Quality, University of Life Sciences in Lublin, Skromna 8, 20-704 Lublin, Poland
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