Phosphorylation of the transcriptional regulator MYB44 by mitogen activated protein kinase regulates Arabidopsis seed germination

► We have examined the function of the transcriptional regulator MYB44 from Arabidopsis thaliana. ► MYB44 regulates abscisic acid (ABA) and gibberellic acid (GA) control of germination. ► MYB44 is a substrate of the mitogen activated protein kinases (MPKs) MPK3 and MPK6. ► Phosphorylation of MYB44 by MPKs is required for its function.