Figure 7.

A Working Model Depicting the Molecular Framework of JA-ET Antagonism in Hook Development.

ET stabilizes EIN3/EIL1 proteins, which directly induce the transcription of HLS1, an essential positive regulator of hook development. By contrast, JA promotes EIN3/EIL1 degradation by inducing EBF1 expression via the activation of MYC2, an important transcription factor in the JA pathway. Meanwhile, JA-activated MYC2 represses EIN3 transcriptional activity via direct protein–protein interaction. These two layers of regulation finally repress ET-mediated hook development.

[See online article for color version of this figure.]