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The proposed model of hormonal regulation (by ET and JA) on transcription of P. ultimum response genes in apple root. Accumulated ET and JA in response to the P. ultimum infection activate the MdERF1 expression through SCFCOI1-JAZ proteasome activity for subsequent activation of MdCHIB. ET and JA also can regulate their own biosynthesis pathways as either positive or negative feedback regulation.
