Inhibition of FUSCA3 degradation at high temperature is dependent on ABA signaling and is regulated by the ABA/GA ratio.During seed imbibition at supra-optimal temperature, an increase in the abscisic acid (ABA)/gibberellin (GA) ratio imposes secondary dormancy to prevent germination (thermoinhibition).  We show that the ABA receptor mutant, pyl1-1, is less sensitive to ABA and thermoinhibition.  Similarly, GA alleviates thermoinhibition and also increases FUS3 degradation. 
THERM