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).