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    Adaptation of endemic mediterranean Sternbergia candida Mathew Et T. Baytop in the continental climate of central anatolia
    (Elsevier, 2009) Gurbuz, Bilal; Arslan, Neset; Khawar, Khalid Mahmood; Ipek, Arif; Sarihan, Ercument Osman; Ozcan, Sebahattin; Parmaksiz, Iskender
    Sternbergia candida is an important endemic bulbous plant with beautiful white flowers. It grows on the rock slopes of Baba mountains under Lebanon Cedars in the Mugla province of Turkey with Mediterranean climate. The plant is vulnerable and endangered due to illegal collection for local and foreign flower industry. Fast developing tourism industry and rapid urbanization has also shown negative implications on its population. The study reports three years successful adaptation results of S. candida in the continental climate of Ankara in the Central Anatolia. Four groups of bulbs based on diameter (>2.45, 2.15-2.44, 1.85-2.14 and <1.84 cm) were collected from its natural habitat during March, April and May 1998 and were evaluated for frequency (%) of emergence, mean number of leaves per plant, mean plant height, frequency (%) of flowering, frequency (%) of fruit setting. mean number of bulbs per plant, and mean diameter (cm) of regenerated bulbs. All categories of bulbs could be multiplied and adapted successfully with variable frequency of fruit setting. However, the highest fruit set was recorded from 2.15-2.44 cm April collected bulbs. This indicated that the bulb diameter and collection time had clear implications on multiplication, propagation and adaptation of the plant. (C) 2009 Elsevier B.V. All rights reserved.
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    Effects of diurnal and ontogenetic variability on essential oil composition of oregano (Origanum vulgare var. hirtum)
    (Asian Journal Of Chemistry, 2008) Gumuscu, Ahmet; Ipek, Arif; Sarihan, Ercument O.; Gurbuz, Bilal; Kaya, M. Demir; Arslan, Neset
    This study was carried out to determine the effects of diurnal and stage of harvesting on the essential oil components of oregano (Origanum vulgare var. hirtum). The samples were collected at three different stages of flowering (before and after flowering) and six different times (06:00, 09:00, 12:00, 15:00, 18:00 and 21:00 h) with drying under shade or sunshine. Essential oil was obtained by hydrodistillation method and analyzed with GC-MS. Results showed that the main compound of O. vulgare var. hirtum was thymol. The harvest stage affected the compounds of essential oil such that p-cymene increased at full flowering while gamma-terpinene decreased. Drying methods and harvesting time showed a minor effect on volatile compounds. The highest variation in composition of essential oil in relation to harvest stage was determined in p-cymene and gamma-terpinene. It was concluded that the harvest stage along with drying under shade should be firstly considered.