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AKPINAR, AYŞEGÜL

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AKPINAR

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AYŞEGÜL

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2015 - 201912020 - 20231
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    Publication
    Ni-induced changes in nitrate assimilation and antioxidant metabolism of verbascum olympicum Boiss.: Could the plant be useful for phytoremediation or/and restoration purposes?
    (Taylor & Francis, 2015-01-01) Akpınar, Ayşegül; Arslan, Hülya; Güleryüz, Gürcan; Kırmızı, Serap; Erdemir, Ümran Seven; Güçer, Şeref; AKPINAR, AYŞEGÜL; ARSLAN, HÜLYA; GÜLERYÜZ, GÜRCAN; KIRMIZI, SERAP; SEVEN ERDEMİR, ÜMRAN; Güçer, Şeref; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü.; Uludağ Üniversitesi/Gemlik Asım Kocabıyık Meslek Yüksekokulu.; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0001-5441-037X; 0000-0003-3243-9168; 0000-0003-0610-2019; 0000-0002-2680-9815; 0000-0002-4606-0645; AAQ-8139-2021; D-2584-2016; A-5538-2019; HJY-1959-2023; Q-5688-2017; IVM-2806-2023; GAV-3362-2022
    Verbascum olympicum Boiss. (Scrophulariaceae) were studied as a candidate plant for remediating the Ni polluted soils. The metabolic responses, such as nitrate assimilation (nitrate reductase and glutamine synthetase activity) and antioxidant system activity [superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) activity], of this species exposed to nickel in Hoagland's nutrient medium were investigated as remediation performance parameters. The accumulation of nickel and the variations in the content of some elements (B, Cu, Fe, Mg, Mn, Mo and Zn) and some growth parameters, such as the water content, biomass production, and contents of chlorophyll and soluble protein, were also examined. The accumulation of Ni in both the roots and leaves varied depending on the exposure times and doses. Increased oxidative stress was suggested by the increases in the activities of SOD, CAT and APX. Although some element contents were inhibited by Ni treatments, these inhibitory effects was decreased depending on the time, and even these elements are accumulated in roots. These results are the novelties in the use of this species in biotechnology.
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    Physiological and biochemical mechanisms of salinity tolerance in Carex morrowii boott
    (Tech Science Press, 2023-04-11) Akpınar, Aysegül; AKPINAR, AYŞEGÜL; Bursa Uludağ Üniversitesi/Ziraat Fakültesi.; HJY-1959-2023
    Carex species are widely used in many parts of the world and contain a large number of ecologically diverse species. Among the Carex species, some of them are known to be glycophytes, while others are halophytes. Carex morrowii Boott (Cyperaceae) is resistant to trample through their root structure and has an essential ornamental value in the landscape with their leaves. However, no information was found about the level of salinity tolerance/sensitivity of the Carex morrowii among these species. In the present study, changes in trace element contents (Na, K, Ca, Cu, Mn, Mg, Ni, Fe, P, Zn, and N) and their transport from roots to leaves, osmotic regulation, alterations in chlorophyll and carotenoid contents, nitrogen assimilation (nitrate reductase activity; NRA) and total soluble protein content in both roots and leaves of Carex morrowii under different salinity concentrations (50 mM, 100 mM, 200 mM and 300 mM NaCl) were examined in detail. Our study provides the first detailed data concerning the responses of leaves and roots and the determination of the level of salinity tolerance/sensitivity of the Carex morrowii. The K+/Na+ ratio was preserved up to 200 mM NaCl, and accordingly, the element uptake and transport ratios showed that they could control moderate NaCl levels. Ca homeostasis that is maintained even in 200 mM NaCl concentration can be effective in maintaining the structural integrity and selective permeability of the cell membranes, while 300 mM NaCl concentration caused decreased photosynthetic pigments, and deterioration in element content and compartmentation. Moreover, these data suggest that plant parts of Carex morrowii respond differently against varied levels of salinity stress. Although the decrease in NR activity at 200 mM and 300 mM NaCl concentrations in the leaves, NR activity was maintained in the roots. Consequently, Carex morrowii is moderately tolerant to salinity and the carotenoid content and osmotic regulation of Carex morrowii appears to be instrumental in its survival at different salinity levels. Especially the roots of Carex morrowii have a remarkable role in salinity tolerance.