Akademik Veri Yönetim Sistemi
Journal of Plant Growth Regulation, 2026 (SCI-Expanded, Scopus)
Abscission is a crucial biological process for organ detachment in plants. Flower bud abscission in the 'ON' year significantly contributed to pistachio alternate bearing, with carbohydrate levels involved in this phenomenon. The study aimed to investigate the role of foliar silicon (Si) as a nutrient in the expression pattern of genes involved in carbohydrate metabolism at concentrations of 0, 5, and 10 g L−1 in two commercial pistachio cultivars including “Fandoghi” and “Akbari”, 14 days after full bloom (DAFB) in the 'ON' year. The results indicated that the expression levels of all five genes including α and β-amylase, callose synthase (CalS), galactinol synthase (GolS), and Starch synthase, were different in leaf, fruit, and abscission zone (AZ) tissues. Additionally, these genes were upregulated with silicon treatment in the AZ. Overall, the sucrose content was higher in treated samples compared to the control. The highest level of soluble carbohydrates (0.58 mg g−1 FW) was observed in the “Akbari” cultivar at a concentration of 5 g L−1 of silica in the AZ. Glucose content increased in both cultivars, with a significant rise of 2.90 mM at 5 g L−1 of Si. The “Akbari” cultivar showed the highest fructose concentration at 5 and 10 g L−1 of Si, and the application of 10 g L−1 of Si in 14 DAFB reduced the bud abscission rate to 9.69. The simultaneous regulation of these genes and activation of the carbohydrate storage and consumption pathway during the critical flowering stage by silicon indicate its dual role in regulating the expression of carbohydrate pathway genes.