| Litchi is one species of the characteristic fruits in south China, salicylic acid and chitosan are innoxious natural products, having been confirmed to improve plant resistance physiological function, and improve fruit quality and film on postharvest fruit, they can keep litchi fresh. This study with "guai wei" litchi as experimental materials, studied salicylic acid and chitosan on the influence of litchi physiological changes under cold stress condition in the winter and using two kinds of reagents before harvesting in order to show the effect on litchi quality, and the influence of film effect of preservation of lychees. The main result are shown as follows:1. According to our results, appropriate concentration of chitosan and salicylic acid could effectively reduce the cold damage to litchicompared with that treated by water, litchi chlorophyll, proline, soluble protein content were increased and the protecting enzyme activity was significantly increased, however, accumulation of MDA reduced.. Therefore, spraying chitosan and salicylic acid on litchi can significantly improve it's cold resistance, in particularly, treatment with combination of 1000 mg/L chitosan and 50 mg/L salicylic acid is of great effect.2. Before litchi croping, spraying salicylic acid and chitosan can significantly improve litchi quality, but the concentration should not be too low nor too high, otherwise, both cases will make the effect become poor, when 50 mg/L of salicylic acid and 1,000 mg/L of chitosan blends together, the effect was more obvious.3. Salicylic acid and salicylic acid mixed with chitosan have unique efficacy for litchi preserving. The results showed that with salicylic acid treatment postharvest litchi had the low rotting rate, browning rate and water loss rate, ultimately, it could keep the fruits in good quality and flavor than using with mixture of salicylic acid with chitosan... |
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