Effect of Different Hormone Applications on Antioxidant Enzyme Activities of Strawberry Leaves

This study was carried out to determine the effect of the application of methyl jasmonate (MeJa) and gibberellic acid (GA3) on the antioxidant enzyme activity in 5 different strawberry cultivars (Albion, Aromas, Honeoye, Seascape, Sweet Ann). The application of 50 ppm and 100ppm GA3 and 0.25, 0.50, and 1.00 mM doses MeJA was applied as foliar spray. Catalase (CAT), superoxide dismutase (SOD) and malondialdehyde MDA levels were determined in the collected leaf. Samples sweet Ann cultivar had the highest CAT and SOD activity while Honeoye cultivar had the lowest values. CAT activity was decreased in Seascape and Aromas cultivars, and it was observed that CAT activity variability according to application and dose in other cultivars. The amount of SOD has increased with each application in the Albion and Seascape cultivars. In contrast to CAT and SOD activity, MDA concentration was determined the highest in Honeoye and the lowest in Sweet Ann. The present study, it was determined that the hormone (GA3, MeJa) applications affected the enzyme and MDA contents depending on the cultivars and the doses of the hormones