Abstract
Plants are often exposed to external conditions that adversely affect their growth, development and productivity. Almost cases of NaCl exposure induces the cell death thought the complex network such as cell volume changes, DNA damages, oxidative burst, inhibition of transcription and translation and mitochondrial depolarization. High concentration of NaCl also increases the organic osmolytes. However, high concentration of osmolytes also have toxic effects by operating almost similarly pathways of NaCl leading to cell death. In this study, we were focusing on hyperosmotic stresses (NaCl and sorbitol)-induced ROS generation and cytosolic Ca2+ increase as initial responses of plants, then the relations between these responses and signaling pathways (adaptation/cell death induction) were investigated. The involvement of peroxidase-mediated singlet oxygen (1O2) generation in hyperosmosis stress signaling was suggested. Addition, 1O2 generation induced Ca2+ signaling have the small role of adaptation of hyperosomosis changes.
