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    Antimicrobial activities of some narrow endemic gypsopyhte
    (İstanbul Üniversitesi, 2021) Ocak, Esma; İnci, Şule; Öztürk, Derviş; Akdeniz Şafak, Sanem; Özdeniz, Ebru; Kırbağ, Sevda; Evren, Ahmet Harun; Kurt, Latif
    Background and Aims: In this study, antimicrobial activities of extracts obtained from narrowly dispersed local endemic gypsophytes grown in extreme habitats were investigated for the first time. The aim of this study was to analyzed antimicrobial effects of narrow endemic plants that are Thymus ekimiiYildirimli, Verbascum gypsicola Vural & Aydogdu, Glaucium secmeniiYildirimli and Psephellus erzincani Wagenitz & Kandemir. Methods: Antimicrobial activity of T. ekimii, V. gypsicola, G. secmenii and P. erzincani were determined according to the disk diffusion method. The microorganisms used for the present investigation; gram positive bacteria, gram negative bacteria and yeasts (Bacillus megaterium DSM32, Escherichia coli ATCC25922, Candida albicans FMC17). Results: According to the results obtained, P. erzincani showed the best antimicrobial activity against B. megaterium DSM32 (23 mm), E. coliATCC25922 (15 mm) and C. albicans FMC17 (23mm), respectively. Conclusion: This study showed that extracts of these endemic plants have the potential for use as antimicrobial agents, especially P. erzincani.
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    The role of biochemical regulation on the adaptation of gypsophile and gypsovag species
    (PERGAMON-ELSEVIER SCIENCE, 2018) Çekiç, Fazilet Özlem; Özdeniz, Ebru; Öktem, Mert; Kurt, Latif; Keleş, Yüksel
    There are two groups of plant species that spread in gypsiferous soils. While gypsophytes only grow on gypsi-ferous soils, gypsovags can grow on both gypsum and non-gypsum soil. Adaptation of plants to gypsum soils requires biochemical arrangements in addition to proper morphological and physiological characteristics. In this study, three gypsophyte species and on-gypsum and non-gypsum speciments of three gypsovag species were examined for antioxidant capacities. The average phenolic substance contents were 126.5, 30.5 and 37.6 mu g g(-1)W in gypsophile, on-gypsum and in non-gypsum gypsovag species respectively. Gypsophyte, Thymus leucos-tomus var. gypsaceus species was identified as having seven different phenolic compounds and the highest phenolic substance content. However, phenolic substance compositions of gypsophyte and gypsovag plant species do not have common properties and show specific differences for each species. The total antioxidant capacity and carotenoid levels of gypsophyte were found to be quite high even though there was no significant difference between the chlorophyll values of the plant groups under investigation. Differences in car/chl and aox/chl ratios of gypsophiles and gypsovag species suggest that antioxidant compounds have a role in the adaptation of these plants. On the other hand, the values observed in on-gypsum and non-gypsum gypsovag species should be assessed as having no specific role in the formation of oxidative stress in gypsum soils.
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    Variation of phenolic and pigment composition depending on soil type in three serpentinovag plant species
    (Pamukkale University, 2021) Albayrak, Fazilet Özlem; Özdeniz, Ebru; Kurt, Latif; Keleş, Yüksel
    Serpentine soils are stressful for plant growth, due to nutrient deficiencies, especially Ca, low water-holding capacity, and high levels of heavy metals and Mg. Determination of biochemical differences of plants grown in serpentine and non-serpentine soil can contribute to understanding tolerance to serpentine soil. In this study, samples of three plant species (Alyssum sibiricum Willd., Salvia absconditiflora (Montbret & Aucher ex Bentham) Greuter & Burdet and Centaurea urvillei DC. subsp. stepposa Wagenitz) were compared in terms of the composition of phenolic compounds and chloroplast pigments. Higher amounts of phenolic compounds were measured in serpentine soil-grown forms of all three species. Total soluble phenolic content, in samples grown in serpentine and non-serpentine soil, respectively, S. absconditiflora 731.8 - 161.7, C. urvillei 121.0-49.7 and A. sibiricum 50.2- 47.3 µg g-1 DW). It was determined that the amount of chlorophyll a was higher in the serpentine soil grown forms of all three species while the amount of chlorophyll b was variable. In plants grown in serpentine soil, ?-carotene values are higher than non-serpentine forms. Total xanthophyl values are also parallel with ?-carotene findings, but lower. The findings in the present study show that antioxidant compounds such as phenolics and carotenoids may play a role in the stress tolerance of plants growing in serpentine habitats.