Figure 5. A proposed working model of the phyB-RVE1/2 pathway in regulating seed dormancy and germination.

During seed development, the transcripts of RVE1 and RVE2 are increasingly accumulated to induce and maintain seeds at the dormant state. Red light triggers the activation of phyB (Pfr form), which represses RVE1 and RVE2 expression, leading to the de-suppression of the GA biosynthetic gene GA3ox2 and the accumulation of bioactive GAs, and consequently the induction of seed germination.