Mutlu F.Yurekli F.Kirecci O.Dengiz F.2024-08-042024-08-0420181018-4619https://hdl.handle.net/11616/90890Wheat cultivars chosen for their cadmium (Cd) tolerance (Sönmez-2001) and sensitivity (Quality) were grown in Hoagland solution for 5 days and then they were treated with 50, 100 and 200?M sodium nitroprusside (SNP), a NO donor, with 9 mM Cd. Samples were taken at 24th and 72nd hours after the administration. In the present study, when examining changes in activities of antioxidant enzymes (SOD, CAT, APX, and GST) which are known as internal defense systems built up by cultivars against Cd stress, these enzymes were observed to pose different responses compared to Cd and Cd+SNP administrations. Malondialdehyde (MDA) concentration in plant tissues were also determine comparatively in order to find out lipid peroxidation. The obtained results showed that Cd stress significantly increased lipid peroxidation, superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione S-transferase (GST) activities. This increase was found to be higher at various rates in different treatments in sensitive cultivar Quality compared to tolerant cultivar Sönmez-2001. Cd+SNP treatments increased antioxidant enzyme activities throughout the applications compared to cadmium. This increase was determined to be significant especially in Quality cultivar and thus substantially reduced Cd toxicity. Some Cd+SNP treatments lead to decline in enzyme activities and decrease in lipid peroxidation. In Sönmez cultivar, Cd+100?M SNP treatment decreased catalase activity at 24th and 72nd hours compared to cadmium treatment; Cd+50?M SNP reduced GST activity at 72nd hour in both cultivars. Cd+SNP treatments increased MDA levels identified at 24th and 72nd hours in Quality cultivar compared to cadmium treatment; but it led to decrease MDA levels in Sönmez cultivar. This decrease was found as 46.40% in Cd+ 100?M SNP treatment and 51.43% in Cd+ 200?M SNP treatment at 72nd hour. Based on the decrease in MDA level in Sönmez cultivar, especially at 24th hour, Quality cultivar was found to have higher MDA content than Sönmez cultivar. NO demonstrated a reduced or counteractive effect on the Cdinduced increase in the activities of some typical antioxidant enzymes. These results indicate that SNP has great application potential for improving the growth of plants under heavy metal stress such as Cd toxicity. © by PSP.eninfo:eu-repo/semantics/closedAccessAntioxidant enzymesCadmium stressMDANitric oxideTriticum aestivumArticle2714214292-s2.0-85050891016N/A