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Morphological and chemical variability of common oregano (Origanum vulgare L. subsp. vulgare) occurring in eastern Poland

100%

Kosakowska O., Czupa W.

Herba Polonica

2018

tom 64

nr 1

Common oregano is an important medicinal and aromatic plant, characterized by a high morphological and chemical variability. The aim of the work was to determine the diversity of 14 common oregano populations introduced into ex situ conditions, in respect of morphological and developmental traits as well as content and composition of essential oil in herb. Observations and harvest of raw material were performed in the second year of plant vegetation. Morphological and developmental characters were estimated. Total content of essential oil was determined according to European Pharmacopoeia 8th. The composition of essential oil was carried out by gas chromatography. Populations differed in respect of examined traits, i.a.: plant’s height from 52.13 to 88.66 cm, number of stems per plant from 45.6 to 123.3, number of internodes per stem from 4.6 to 9.2. Fresh mass of herb was at a level of 249.0–896.6 g per plant. Total content of essential oil ranged from 0.35 to 0.87%. Sabinene, 1,8-cineole, linalool, p-cymene, β-caryophyllene and caryophyllene oxide were the dominant compounds in essential oil. Number of stems and fresh mass of herb differentiated examined populations at the highest degree. Most of populations were classified as a sabinyl chemotype rich in sesquiterpenes.

Herb yield and chemical composition of common oregano [Origanum vulgare L.] essential oil according to the plant's developmental stage

80%

Nurzynska-Wierdak R.

Herba Polonica

2009

tom 55

nr 3

55-62

The studies conducted in 2007–2008 were aimed to assess how the developmental stage of common oregano affected the quality and quantity of the herb yield. The field experiment was established with the use of random blocks in four repetitions. Oregano was grown from seeding produced in a greenhouse. Herbage harvest of one-year-old plants was conducted before flowering, in budding phase, at the beginning of flowering and in the full flowering phase. The yield of fresh and air dry herb yield and then the contents of essential oil was determined. The oil was chemically analyzed with the use of GC/MS method. It was demonstrated that the best term for oregano raw material harvest was the full flowering stage of the plants. In this period the yields of fresh and air dry weights as well as the essential oil contents were the greatest. The oil from the herb collected in the initial phase of flowering had the largest number of components, whereas the oil obtained in the budding phase had the smallest. The predominant components of oregano oil were: sabinene, germacrene D, E-caryophyllene, (Z)-β-ocimene and γ-terpinene. The examined oil also contained phenol compounds: thymol and carvacrol – highly bactericidal and fungicidal substances.

Ograniczanie wyników

2 Herba Polonica

1 Czupa W.

1 Kosakowska O.

1 Nurzynska-Wierdak R.

1 2018

1 2009

Wyniki wyszukiwania

Morphological and chemical variability of common oregano (Origanum vulgare L. subsp. vulgare) occurring in eastern Poland

Herb yield and chemical composition of common oregano [Origanum vulgare L.] essential oil according to the plant's developmental stage