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Schematic model of the role of the RhPIF8–RhBBX28 regulatory module in petal senescence. In rose petals, H2O2 levels follow a circadian rhythm, which is consistent with the respiratory rate of petals. The RhPIF8–RhBBX28 module represents a surveillance component to constrain RhSDH1 expression, and thus the strength of the TCA cycle, to a proper level to avoid excessive mtROS production in petals at night.
