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Soaking the harvested fruit with chemical fungicides is a general method for fruit preservation. However, due to the concerns of consumers about chemical residues and the lack of postharvest treatment conditions in litchi producing areas, there is an urgent need to develop green, environment-friendly preservation techniques for litchi, which is also easy to apply. In this study,'Jingganghongnuo' litchi was sprayed with 5 mmol/L sucrose solution at the latter stage of fruit development (10 days before harvest), and stored at room temperature (20 ℃) after harvest. The results showed that, compared with the control, pre-harvest sucrose treatment reduced the browning index, disease index and decay rate of harvested litchi, decreased the chromaticity a* value and increased the L* and b* values, indicating that sucrose treatment improved the appearance quality of litchi. The sucrose-treated litchi was not significantly different from the control in the content of soluble solid (TSS) and titratable acid (TA), although they were slightly lower than that of the control in the content of Vc, suggesting that it had no significant adverse effect on nutritional quality. Sucrose treatment inhibited the activities of polyphenol oxidase (PPO) and peroxidase (POD) in litchi pericarp, reduced the contents of relative conductivity (REC), malondialdehyde (MDA), hydrogen peroxide (H2O2) and superoxide anion (), and increased the activity of phenylalanine ammonia lyase (PAL) and total phenol content in litchi pericarp, so as to delay the browning and decay of litchi. This study shows that pre-harvest sucrose treatment, as a new litchi preservation technology, has a certain prospect for application in litchi producing areas in China.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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