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A Model of PAR1 and PIF4 Functions in Light and Hormone Responses.
In the absence of PAR1, PIF4 binds to DNA to inhibit photomorphogenesis and promote high-temperature and GA responses. Light induces degradation of PIF4 and stabilizes PAR1. Accumulated PAR1 inhibits PIF4 activity by preventing PIF4 from binding to DNA. PRE1, which is induced by BR, GA, and auxin, interacts with PAR1, and possibly prevents its interaction with PIF4.
