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A proposed working model for the regulatory network of TgNAP during tulip petal senescence. TgNAP is induced by petal senescence and exogenous SA treatment, which subsequently activates TgICS1 and TgPAL1 transcription to enhance SA accumulation. In parallel, H2O2 scavenging genes TgPOD12 and TgPOD17 are repressed by TgNAP resulting in increasing ROS levels. Finally, SA and H2O2 work together to accelerate petal senescence in tulip.
