bZIP TFs involved in osmotic stress response
Salinity and drought usually induce secondary stress, osmotic stress. Hence, it’s not difficult to understand that plant bZIPs also act as significant roles in response to osmotic stress.
The rice OsbZIP71 transcription factor recognizes and combines with the promoter of the osmo-regulatory gene OsNHX1 , transports excess Na+ and K+ in the cytoplasm to the vacuole, reducing salt concentration in the cytoplasm to improve rice salt tolerance (Liu et al., 2014a). In Arabidopsis thaliana , the AtbZIP63 can regulate protein-protein interactions to regulate the activity of proline dehydrogenase I, thereby enhancing the ability of the plant to tolerate hypotonic stress (Veerabagu et al., 2014); the VIP1 (AtbZIP51) rapidly accumulates in the nucleus in response to hypotonic stress (Hwang et al., 2014; Tsugama et al., 2016). Actually, VIP1/AtbZIP51 and bZIP29 can form a heterodimer to enhance their binding to the hypotonic response element (AGCTGK) in the promoters of osmotic response genes CYP707A1 and CYP707A3 (Van Leene et al., 2016).