Tag Archives: accessions

xxx I. Sivicka, A. Adamovics, S. Ivanovs and E. Osinska
Some morphological and chemical characteristics of oregano (Origanum vulgare L.) in Latvia
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Some morphological and chemical characteristics of oregano (Origanum vulgare L.) in Latvia

I. Sivicka¹*, A. Adamovics¹, S. Ivanovs¹ and E. Osinska²

¹Latvia University of Life Sciences and Technologies, Liela iela 2, LV-3001 Jelgava, Latvia
²Warsaw University of Life Sciences, Nowoursynowska 159, PL02-776 Warsaw, Poland
*Correspondence: Irina.Sivicka@llu.lv

Abstract:

By European Cooperative Programme for Plant Genetic Resources (ECPGR), oregano (Origanum vulgare L.) is included on the list of priority species of medicinal and aromatic plants. In Latvia, it is important to cultivate oregano for keeping biodiversity and for meeting the needs of medicinal plant`s production. 44 accessions of oregano from the ex situ collection of genetic resources of medicinal and aromatic plants, attached to the Latvia University of Life Sciences and Technologies, were analysed during 2012–2014. Plants` morphological characteristics were described by the Draft Descriptor List of oregano, using the methodology of ECPGR. The essential oil was isolated using solvent-free microwave extraction method and analysed by gas chromatograph Hewlett Packard 6890 equipped with flame ionization detector FID and polar capillary column HP 20M. The results showed, that oregano accessions differ morphologically. Accessions are characterized with dense branching and the possibility to create big biomass. Local oregano is poor in content of essential oil, but 17 compounds were identified as the principal. As well as the correlation between the content of essential oil and colour of flowers in full flowering stage was observed – it is higher for accessions with dark flowers. Also, the influence of meteorological conditions per vegetation period (year) on chemical characteristics was significant (p < 0.05).

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537-544 I. Dzene, A. Jansons, B. Jansone and S. Rancane
The study of variability of agro-morphological characteristics of white clover accessions from other countries in Latvian climate conditions
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The study of variability of agro-morphological characteristics of white clover accessions from other countries in Latvian climate conditions

I. Dzene, A. Jansons, B. Jansone and S. Rancane

LUA Research Institute of Agriculture, 7 Zemkopibas instituts, Skriveri, Skriveruregion, Latvia, LV-5125; e-mail: szc@inbox.lv

Abstract:

White clover (Trifolium repens L.) is one of the most important forage legumes in temperate grasslands because of its large spread, good adaptability, high nutritive value combined with a good palatability and by its nitrogen-fixing capacity (Balan, 2007). The evaluation of the white clover germplasm collections under field conditions is recognized as a general method to estimate biological diversity. During the years 2006–08 experimental field trials were performed at the Research Institute of Agriculture in Latvia. A white clover collection of 46 samples with large-scale geographic origins from 19 countries was established. Wild populations gathered in Latvia and Lithuania were also included in the collection. Native cultivar ‘Daile’ as the standard was used. All three white clover varietas (var.) – silvestris, hollandicum, and giganteum – were represented in the collection. A huge diversity of morphologically different plants was observed among the collected samples. Winter-hardiness, earliness, growth intensity, time of flowering, weight of leaves and flower heads, length of sprouts, size of the central leaflet, etc, are the important traits of the genetic variability. Among the white clover accessions were samples with untraditional reddish-rose-colored flower heads. The aim of the study was to select valuable source material for future breeding with a good possibility of adaptation in the changeable climate and different soils in Latvia, with high productivity, good disease resistance, of many years’ standing in the sward, etc. Our research shows that large genetic variability exists within the investigated white clover collection. The evaluation of samples of our white clover collection in the agro-climatic conditions of Latvia shows that some varieties are featured with several morphological qualities and could be appropriate as promising material for the creation of a new variety. These are ‘Dubraux’ (Czech Republic/Slovakia); ‘Gigant’ (Belgium); ‘Huia’ (New Zealand) and local wild population ‘Ecotype 2005’, which stand out for their winter-hardiness, earliness, production of a large foliage surface and produce high seed yield.

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