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    A comparative study of the antimicrobial properties and antioxidant enzyme activities of field-grown and in vitro-propagated plants of endemic Digitalis trojana Ivanina
    (Inst Bioloska Istrazivanja Sinisa Stankovic, 2017) Corduk, Nursen; Demirbas, Sefer; Dogru, Nurcihan Hacioglu
    The antimicrobial properties and antioxidant enzyme activities of field-grown and in vitro-propagated plants of Digitalis trojana Ivanina (Helen of Troy foxglove), a perennial endemic plant species of Turkey, were compared. The field work was carried out in May and July 2014, and plant samples of D. trojana were collected from Kazdagi (Turkey). Propagation of D. trojana was achieved by culturing leaf explants on MS medium supplemented with 13.3 mu M 6-benzyl-aminopurine (BA) and 0.53 mu M alpha-naphthaleneacetic acid (NAA). The antimicrobial activity, plant lipid peroxidation levels and antioxidant enzyme (superoxide dismutase (SOD), catalase (CAT), peroxidase (POX), ascorbate peroxidase (APX), glutathione reductase (GR)) activities were analyzed in 12- and 17-week-old in vitro-grown Digitalis plants collected in May and July from two different localities at 430 and 1173 m above sea level. Although the in vitro-propagated plants had very low antagonistic activities compared to field-grown plants, they exhibited remarkably similar antibacterial activities against Escherichia coli ATCC 11230, Pseudomonas aeruginosa ATCC 27853 and Bacillus subtilis ATCC 6633. There were no important differences between plants collected from the two localities (430 and 1173 m a. s. l.). Biochemical analysis showed that the antioxidant enzyme (SOD, APX, GR) activities of field-grown plants were higher than in vitro-grown plants. Also, the difference in altitude at which the plants were grown was apparently linked to decreases in antioxidant enzyme activities, except for POX in field-grown plants collected in July.
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    Assessment of Nuclear Abnormalities in Erythrocytes of Balkan Pond Turtle Mauremys rivulata (Valenciennes, 1833) (Testudines: Geoemydidae) from the Biga Stream, Canakkale, Turkey
    (Inst Zoology, Bas, 2019) Corduk, Nursen; Dogru, Nurcihan Hacioglu; Gull, Cigdem; Tosunoğlu, Murat
    Reptilian species are potentially efficient bioindicators of pollution and habitat destruction. Turtles may be especially useful for monitoring the chemical contamination of their habitats. The aim of this study was to assess the genotoxic effect of environmental pollutants on Balkan pond turtle Mauremys rivulata (Valenciennes, 1833) from the Biga Streamp Canakkale, Turkey. Healthy mature animals were collected using the hand-capture method from four stations: estuary zone, city centre, buffer zone and industrial zone of the stream. Blood samples of live specimens were obtained in within one day of their capture. The peripheral blood smears for each specimen were prepared, fixed with methanol for 15 min and dyed with Giemsa stain. Micronuclei and other nuclear abnormalities such as blebbed, kidney-shaped, lobed and notched nuclei were identified. Comparing the nuclear abnormalities in the samples, it was determined that their frequency was highest in the samples collected from the station in the city centre (9.16 +/- 0.02). The results indicated that the levels of genotoxic pollutants in different regions of the Biga Stream lead to DNA damage in Mauremys rivulata.