The Impact of Phycocyanin Rich Solutions on Growth, Pigment Composition, and Antioxidant Enzyme Activity in Wheat Leaf Segments

Arthrospira platensis is a cyanobacterial species known for its rich nutritional content and biologically active phycocyanin components. Solutions at concentrations of 0.05% and 0.1% were prepared from Arthrospira platensis extracts containing 35 % phycocyanin and applied to wheat leaf segments (Triticum aestivum L.) to investigate their metabolic and biochemical effects. Within the scope of the study, the effects of phycocyanin concentrations on growth parameters, pigment profile (chlorophyll, carotenoid, and anthocyanin), protein content, peroxidase (POD), and catalase (CAT) activity in wheat leaf segments were determined after four days. According to the results, 0.05 g/L phycocyanin solution significantly increased the amount of carotenoids (27%) and anthocyanins (~31%) of the segments compared to control, while 0.1 g/L solution application significantly increased the fresh weight of the segments (49%), total chlorophyll content (28%), protein amount (21%), and decreased POD significantly (22%). There were no significant changes in CAT activities compared to control samples. These findings indicate that phycocyanin supports delayed senescence, promotes plant growth, and contributes to physiological defense systems, suggesting its potential as a biostimulant for sustainable agricultural practices.