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Roses are widely used as cut flowers worldwide. Petal senescence confines the decorative quality of cut rose flowers, an impressively considerable economic loss. Herein, we investigated the SUMO1/SUMO E3 ligase SIZ1 signaling pathway during bud opening, and petal senescence of cut rose flowers. Our results exhibited that the higher expression of  SUMO1  and  SUMO E3 ligase SIZ1  during bud opening was accompanied by lower endogenous H 2 O 2  accumulation arising from higher expression and activities of  SOD ,  CAT ,  APX , and  GR , promoting proline accumulation by increasing  P5CS  expression and activity and enhancing GABA accumulation by increasing  GAD  expression and activity. In harvested flowers, lower expressions of  SUMO1  and  SUMO E3 ligase SIZ1  during petal senescence were associated with higher endogenous H 2 O 2  accumulation due to lower expression and activities of  SOD ,  CAT ,  APX , and  GR . Therefore, promoting the activity of the GABA shunt pathway as realized by higher expression and activities of  GABA-T  and  SSADH  accompanied by increasing  OAT  expression and activity for sufficiently supply proline in rose flowers during petal senescence might serve as an endogenous antisenescence mechanism for slowing down petals senescence by avoiding endogenous H 2 O 2  accumulation. Following phytosulfokine α (PSKα) application, postponing petal senescence in cut rose flowers could be ascribed to higher expression of  SUMO1  and  SUMO E3 ligase SIZ1  accompanied by higher expression and activities of  SOD ,  CAT ,  APX , and  GR , higher activity of GABA shunt pathway as realized by higher expression and activities of  GAD ,  GABA-T , and  SSADH , higher expression and activities of  P5CS  and  OAT  for supplying proline and higher expression of  HSP70  and  HSP90 . Therefore, our results highlight the potential of the PSKα as a promising antisenescence signaling peptide in the floriculture industry for postponing senescence and extending the vase life of cut rose flowers.

Phytosulfokine α (PSKα) delays senescence and reinforces SUMO1/SUMO E3 ligase SIZ1 signaling pathway in cut rose flowers (Rosa hybrida cv. Angelina)