Monitoring of marine pollution and stress responses: Radionuclides concentration and antioxidant molecules in macroalgae and seagrass
Makaleler > Tam Makale · 2025
Yazarlar: Nurdan AKAKÇE, Aysun UĞUR GÖRGÜN, İnci TÜNEY KIZILKAYA, Berkay CAMGÖZ, İlker SERT
CONTINENTAL SHELF RESEARCH, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2025, cilt 293, ss 1-9
DOI: 10.1016/j.csr.2025.105538
Özet
<p>The biological effects of marine radionuclides on the macroalgae Cystoseira crinita and Halopteris scoparia, as well as the seagrass Cymodocea nodosa, were investigated in ˙ Izmir Bay. Concentrations of radionuclides 210Pb, 226Ra, 232Th, and 40K were measured in samples of C. crinita and H. scoparia, whereas only 210Pb and 40K concentrations were determined in C. nodosa. In this study, 210Pb concentrations ranged from 11.38 to 31.72 Bq/kg in C. crinita, 19.7–98.02 Bq/kg in H. scoparia, and 26.09–81.27 Bq/kg in C. nodosa. Elevated 210Pb levels in H. scoparia and C. nodosa were observed predominantly during autumn and winter. The 210Po/210Pb activity ratios were found to range between 1.45 and 2.25 in C. crinita, 0.15–1.30 in H. scoparia, and 0.70–1.47 in C. nodosa. The antioxidant defense mechanisms in response to radiation-induced stress were examined in both macroalgae and seagrass samples, focusing on key biomarkers such as ascorbate peroxidase (APX), catalase (CAT), and proline. Correlation analyses were conducted between radionuclide concentrations and antioxidant activity. C. crinita exhibited a defense response to 210Pb exposure similar to that of 210Po, primarily through increased CAT enzyme activity. In C. nodosa, elevated 40K levels were associated with enhanced proline and APX responses, while the accumulation of 210Pb was met with a significant increase in proline-mediated antioxidant defense.</p>