24-Epi Brassinolidin, Sıcaklık Stresi Koşullarında Parus Ve Gaviota Çilek Çeşitlerinin Bazı Biyokimyasal Özellikleri Üzerine Etkisi

The study was arranged as factorial experiment in a completely randomized design with three applications of cultivar (Parus and Gaviota), 24- Epi brassinolide concentrations (0, 1 and 2 mgl-1) and temperature (normal and stress) as three replications. Some of the measuring characteristics showed that there was a significant difference among the treatments. Under heat stress conditions, foliar application of 24- Epi brassinolide at 1 mgl-1 concentration increased the amount of catalase and superoxide dismutase activity in leaves of Parus cultivar. Both cultivars fruits showed the highest total soluble solid contents in treatment 24- Epi brassinolide spraying at 2 mgl-1 concentrations under normal temperature. The highest total phenolics was in Gaviota cultivar treated with 24- Epi brassinolide spraying at 2 mgl-1 concentrations under normal temperature. Both cultivars had the lowest flavonoid in treatments without 24- Epi brassinolide and with 24- Epi brassinolide at 2 mgl-1 concentrations under heat stress conditions. In Gaviota cultivar, application of high concentration of 24- Epi brassinolide (2 mgl-1) prevented the reduction of total anthocyanin under heat stress conditions.