The effect of ε-poly-l-lysine treatment on molecular, physiological and biochemical indicators related to resistance in longan fruit infected by Phomopsis longanae Chi

Acidic Electrolyzed Water Maintains the Storage Quality of Postharvest Wampee Fruit by Activating the Disease Resistance

“…Lignin, a phenolic polymer, plays a vital role in plant secondary cell walls, enhancing the mechanical strength of these walls and enhancing plant resistance to pathogen invasion [10,26,27]. Higher lignin content has been associated with increased disease defense, slowing disease development in plants [7,12,26]. Various treatments, including ε-poly-L-lysine [7], melatonin [10], ultraviolet-C irradiation [28], and burdock fructooligosaccharide [29], have been shown to promote lignin accumulation, which enhances disease resistance, slows disease occurrence, and stabilizes fresh product quality.…”

“…Higher lignin content has been associated with increased disease defense, slowing disease development in plants [7,12,26]. Various treatments, including ε-poly-L-lysine [7], melatonin [10], ultraviolet-C irradiation [28], and burdock fructooligosaccharide [29], have been shown to promote lignin accumulation, which enhances disease resistance, slows disease occurrence, and stabilizes fresh product quality. Therefore, lignin content is crucial for postharvest disease occurrence, and higher lignin content may delay disease development while preserving the quality of fresh produce.…”

“…Ten grams of pericarp tissue of wampees were dried at 100 • C to a fixed weight. Thereafter, three grams of dried pericarp tissue were taken for assaying the content of lignin according to the methodology of Sun et al [7]. Lignin content was expressed as g/kg.…”

“…According to Sun et al [7] and Tang et al [8], the activities of DREs (e.g., 4-CL, CHI, PPO, PAL, GLU, CAD, and C4H) were determined.…”

“…Research has indicated that the level of disease resistance can affect postharvest disease development, ultimately compromising the quality of fresh produce [5][6][7][8][9]. Key players in adjusting disease resistance metabolism and influencing disease resistance include disease resistance enzymes (DREs), such as 4-coumarate CoA ligase (4-CL), phenylalanine Foods 2024, 13, 1556 2 of 14 ammonia-lyase (PAL), β-1,3-glucanase (GLU), polyphenol oxidase (PPO), cinnamate-4hydroxylase (C4H), chitinase (CHI), and cinnamyl alcohol dehydrogenase (CAD), along with disease-resistance-related substances, including lignin [7,[10][11][12]. Previous studies showed that the elevated DRE activity and increased disease-resistance-related substance level enhanced disease resistance metabolism, improving disease resistance and suppressing postharvest disease symptoms, thereby preserving fresh product quality [12][13][14][15].…”