Muskmelons (Cucumis melo L.) are major economic crops in the northwestern part of China, and postharvest decay of fruit is serious. In order to reduce postharvest decay and prolong the storage time, the effect of hot water dipping (HWD) on nature decay and mechanisms involved were studied when muskmelon fruit (cv. Yujinxiang) were dipped in hot water at 53°C for 3min. The results showed that postharvest HWD effectively (p <0.01) reduced the decay incidence, 18.9% lower than that in control fruit after 18 days of storage. HWD noticeably enhanced the activities of phenylalanine ammonialyase (PAL), cinnamate-4-hydroxylase (C4H), 4-Coumarate: CoA ligase (4CL), polyphenoloxidase (PPO) and peroxidase (POD), and accumulated phenolic compounds, flavonoid, lignin and hydroxyproline-rich glycoproteins (HRGPs). The treatment effectively maintained fruit firmness by suppressing the activities of endo-1,4-β-d-glucanase (EGase), β-glucosidase (β-Glu), polygalacturonase (PG) and pectinesterase (PME), and promoting the accumulation of suberin and callose. And the data showed a higher correlation between fruit firmness and decay incidence (R 2 =0.8933). Furthermore, HWD could clean the surface of fruits, melt the epicuticular waxes, cover and seal the stomata. These results indicated that postharvest HWD reduced decay incidence by inducing disease resistance and maintaining the firmness in muskmelon fruit. Our data suggest that HWD has the potential to reduce or/and substitute chemical fungicides to control postharvest decay of muskmelon fruits.
Related Content
Effects of postharvest salicylic acid dipping on Alternaria rot and disease resistance of jujube fruit during storage
Considerable postharvest losses caused by Alternaria alternata often occurred in Chinese jujube fruit and synthetic fungicides have been widely used to protect the fruit from Alternaria rot. However, the potential harmfulness of fungicide residues to human health and environment cannot be ignored...


Multiple preharvest treatments with harpin reduce postharvest disease and maintain quality in muskmelon fruit (cv. Huanghemi)
Decay caused by fungal pathogens is responsible for significant economic loss of muskmelon fruit (Cucumis melo L.) in China. However, postharvest treatment is not effective in controlling all of these pathogens, owing to the ability of some of them for latent infection. Therefore, preharvest trea...
Chitosan applications pre- or postharvest prolong raspberry shelf-life quality
Raspberries are fruit with high metabolism that makes them very perishable, impairing their storage and shelf-life. Chitosan coatings have the potential to improve their postharvest life by reducing water loss, respiration rate and decay incidence. The purpose of this work was to study the effect...


Effects and possible mechanisms of tea tree oil vapor treatment on the main disease in postharvest strawberry fruit
The purpose of this study was to investigate the effect of tee tree oil (O) against the main fungal disease in strawberries and a possible mechanism for the effects. O vapor exhibited a higher activity against spore germination and mycelial growth of Botrytis cinerea and Rhizopus stolonifer under...
Integrating plant defense inducing chemical, inorganic salt and hot water treatments for the management of postharvest mango anthracnose
Preharvest dips of mango fruit in plant defense inducing chemicals (PDIC) integrated with postharvest treatments with inorganic salts and hot water were evaluated for the management of anthracnose on artificially inoculated mango fruit. Either of the PDICs salicylic acid or potassium phosphonate ...

Control of Monilinia rots on fruit naturally infected by hot water treatment in commercial trials
In recent years, safer methods for the control of fruit postharvest pathogens have been investigated and heat treatment could represent an effective and safe approach for managing postharvest decay such as Monilinia rots. In the present study, the effect of hot water treatment (HWT) (60°C for 30...
Combination of hot water, Bacillus amyloliquefaciens HF-01 and sodium bicarbonate treatments to control postharvest decay of mandarin fruit
An antagonistic isolate Bacillus amyloliquefaciens HF-01, sodium bicarbonate (SBC) and hot water treatment (HW) were investigated individually and in combination against green and blue mold and sour rot caused by Penicillium digitatum, P. italicum and Geotrichum citri-aurantii respectively, in ma...

Effect of calcium dips combined with mild heating on postharvest life and quality of strawberry
The effect of calcium dips combined with mild heat treatment on quality and postharvest life of strawberries (cv. BARI strawberry-1) was studied. Immediately after harvest, strawberries were treated by dipping in distilled water, CaCl2 solutions at 1%, 2% and 3% for 15 min at 45°C and left untre...
Pearl netting affects postharvest fruit quality in ‘Vergasa’ sweet pepper via light environment manipulation
Red sweet pepper (Capsicum annuum L. cv. Vergasa) was grown under Pearl or black (control) nettings with 35% shading to compare their effects on postharvest fruit quality. Fully colored fruits were harvested four times from October to December, and after each harvest they were stored at 7°C for ...

Effect of postharvest acibenzolar-S-methyl dipping on phenylpropanoid pathway metabolism in muskmelon (Cucumis melo L.) fruits
Muskmelon (Cucumis melo L. cv. Yujinxiang) fruit were dipped in 0.1g/L acibenzolar-S-methyl (ASM) solution for 10min and then stored at room temperature (22±2°C, relative humidity 55–60%). The results indicated that ASM significantly (P ≤0.05) increased the activities of phenylalanine ammon...