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    Essential Plant Nutrients and Heavy Metals Concentrations of Some Medicinal and Aromatic Plants
    (Ankara Univ, Fac Agr, 2014) Esetlili, Bihter Colak; Pekcan, Tulin; Cobanoglu, Ozgur; Aydogdu, Erol; Turan, Sevim; Anac, Dilek
    In Turkey, the majority of medicinal plants at the selling points are wildly harvested. Therefore, no control exists during their growth and development. The public awareness on effects of environmental pollution in this regard especially with respect to heavy metals in the herbs is increasing. With this objective, medicinal and aromatic plants were collected from herbalists in different, densely populated districts of Izmir Municipality. The concentrations of some essential plant nutrient elements (N, P, K, Ca, Mg, Na, Fe, Mn, Cu, Zn, B, and Mo) and toxic heavy metals (Co, Cd, Cr, Ni, and Pb) and Al were measured. Results showed that herbs are rich in the investigated mineral elements; however, some of the heavy metals are found to be at concentrations above the reported critical levels.
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    Natural Radionuclides and Heavy Metal Contents in the Olive (Olea europaea L.) Groves of Northwestern Anatolia
    (Univ Namik Kemal, 2019) Colak Esetlili, Bihter; Pekcan, Tulin; Aydogdu, Erol; Turan, Sevim; Anac, Dilek
    The aim of this study is to examine the content of heavy metal (Cd, Pb, Ni, Cr, Al) and the natural radionuclide (U-238, Th-232, K-40) content of the olive groves around the highway from Aliaga to Ezine. in general, findings show that total heavy metal contents are more in the subsurface soils. in this regard, total Ni contents of the soils changed between 11-69 mg/kg. It is considered the only threatening heavy metal which exceeded 30 mg/kg critical level especially in the soils of the olive groves in Aliaga Soma, Ayvalik, Edremit and Ezine. Bergama region differed in this regard. The highest of total Pb, Cr and Cd contents in the soils of Aliaga region were found 44.59 mg/kg, 60 mg/kg and 0.81 mg/kg, respectively. These findings are found very close to the reference limit values (50, 100 and 1 mg/kg) reported by different scientists. Natural radioactivities of Ra-226, Th-232 and K-40 in the soils were also measured and found 37.45 and 410 Bq/kg respectively which were slightly above the cited limit values (Ra-226:35 Bq/kg, Th-232:30Bq/kg ve K-40:400 Bg/kg). Results in relation to olive leaves indicated that trees were not threatened by the heavy metals in the soils, only in some cases Cr (0.19-0.99 mg/kg) was found over the limit value (0.60 mg/kg). It could be concluded that this risky region with high contamination potential should be studied periodically before it is too late..
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    Three (Turkish) olive cultivars display contrasting salt stress-coping mechanisms under high salinity
    (Springer Heidelberg, 2021) Ayaz, Meltem; Varol, Nurhan; Yolcu, Seher; Pelvan, Alpay; Kaya, Unal; Aydogdu, Erol; Bor, Melike
    Key message All olive cultivars survived high salinity, yet, the question was how they orchestrated antioxidative defense, mannitol accumulation and ion sequestration with different efficiencies due to their genetic makeup. A Mediterranean plant, Olea europaea (olive) is well adapted to high temperature, high light intensity and dry soil conditions hence accepted to be moderately salt tolerant. Control of Na+ and Cl- uptake, accumulation of osmoprotectants and high antioxidative capacity were all attributed to salt stress tolerance of olive, however, there is a great discrepancy between the efficiency and onset of these processes among different cultivars. In present study, three olive cultivars namely Ayvalik, Gemlik and Kilis which are well adapted to different climatic regions extending from cool and high precipitation receiving regions to long hot and dry periods with high light intensity through the growth season were tested for their relative salt-tolerance mechanisms. For this aim, 1-year-old cuttings of these cultivars were treated with 0, 100, 200 and 300 mM NaCl for 30 days. Several physiological and biochemical processes along with their growth performance were analyzed during the experimental period. In general, we found discrepancies in salt stress-coping strategies of these cultivars. Efficient osmoprotection in Gemlik cv. lead to a better leaf water status and photosynthetic performance while, active ion sequestration and high levels of SOD and POX enabled Kilis cv. to be protected from the negative impact of salinity. Moreover, Ayvalik cv. accumulated high levels of mannitol that probably served as an antioxidative molecule to cope with salt stress.