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Hydrogen sulfide (H 2 S) has been identified as a multifunctional signaling molecule in plants. Here, we show that H 2 S delayed postharvest senescence of fresh-cut apples ( Malus  × pumila ) in a dose-dependent manner. Exogenous H 2 S application maintained significantly higher levels of ascorbic acid, flavonoids, total phenolics, reducing sugars and soluble proteins, and lower levels of free amino acids in apple slices compared with controls. Further investigations showed that H 2 S significantly reduced the accumulation of superoxide radicals, hydrogen peroxide (H 2 O 2 ) and malondialdehyde (MDA). Apple fruits fumigated with H 2 S contained significantly higher activities of ascorbate peroxidase (APX), catalase (CAT), glutathione reductase (GR), guaiacol peroxidase (POD) and superoxide dismutase (SOD), and lower activities of lipoxygenase (LOX), phenylalanine ammonia lyase (PAL), polyphenol oxidase (PPO), and protease relative to controls. H 2 S also upregulated  MdDHAR  expression and downregulated the expression of  MdLOX2 ,  MdPG1 ,  MdPPO ,  MdACO1 ,  MdERS1 , and  MdETR1  in postharvest apple tissue. The present study indicates that H 2 S was involved in delaying postharvest senescence of apples by acting as an antioxidant and by regulating senescence-related gene expression.

Hydrogen Sulfide Alleviates Senescence of Fresh-cut Apple by Regulating Antioxidant Defense System and Senescence-related Gene Expression