Transcriptional regulatory landscape of plum (Prunus salicina) fruit ripening.

PsEIN3-1 directly binds PsbZIP44 and PsNAC1 promoter regions in plum (Prunus salicina), linking ethylene signaling to sugar-accumulation and ripening regulatory cascades.

• Why it matters: Fruit ripening in plum is controlled by a complex transcriptional network, but the specific regulatory connections among ripening TFs and downstream processes are not well resolved.
• What they did: The study integrated transcriptome, DNase-seq chromatin accessibility, and DAP-seq DNA-binding profiles for multiple ripening-responsive TF families (EIL, NAC, bZIP, WRKY, MYB, C2H2) to build a position-resolved regulatory network.
• The result: PsbZIP44 effects on ripening and sugar accumulation were preliminarily supported by transient transformation, and comparative analysis across Prunus species revealed conserved regulatory circuits, alongside a Prunus Regulome Atlas resource.

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