Figure 11.

Model for Jasmonate-Regulated Cold Signaling Pathway in Arabidopsis.

Under normal growth conditions, JAZ repressors interact with ICE transcription factors. The physical interactions attenuate transcriptional functions of these downstream transcription factors. Under cold conditions, production of endogenous jasmonate is induced. The COI1 receptor perceives jasmonate and targets JAZ proteins for degradation. Upon degradation of JAZ proteins, the ICE factors are subsequently released to activate CBF/DREB1 gene expression and their downstream cold-responsive genes. Jasmonate also regulates Arabidopsis constitutive and cold acclimation–induced freezing tolerance by influencing the synthesis of secondary metabolites and via some CBF/DREB1-independent pathways. The final outcome of jasmonate regulation is the enhancement of plant tolerance to freezing stress.