Introduction
Fresh longan fruit is one of the leading export products of
Thailand. Postharvest longan fruit can discolour rapidly due to
desiccation during storage at either too low or high temperature.
Fruits are susceptible to various postharvest pathogens. The high
sugar and moisture content in longan fruits induce various decay
organisms to rot the fruit rapidly. Fruit rot usually follows skin
browning. Browning can be associated with dehydration, heat
stress, senescence, chilling injury or disease (Pan, 1994). Chilling
injury symptoms on longan fruit cv. Daw include water soaking
and/or area of browning on the pericarp when stored at 2e7 C
(Jaitrong, 2006). The symptoms appear on the inner side of pericarp
after 5 days of storage. Later, both sides of the pericarp become
brown in color. Browning of longan fruits results from the oxidation
of phenolic compounds by endogenous polyphenol oxidase (PPO)
(Jiang et al., 2002). Sulfur dioxide fumigation is used commercially
to solve the problem
Introduction
Fresh longan fruit is one of the leading export products of
Thailand. Postharvest longan fruit can discolour rapidly due to
desiccation during storage at either too low or high temperature.
Fruits are susceptible to various postharvest pathogens. The high
sugar and moisture content in longan fruits induce various decay
organisms to rot the fruit rapidly. Fruit rot usually follows skin
browning. Browning can be associated with dehydration, heat
stress, senescence, chilling injury or disease (Pan, 1994). Chilling
injury symptoms on longan fruit cv. Daw include water soaking
and/or area of browning on the pericarp when stored at 2e7 C
(Jaitrong, 2006). The symptoms appear on the inner side of pericarp
after 5 days of storage. Later, both sides of the pericarp become
brown in color. Browning of longan fruits results from the oxidation
of phenolic compounds by endogenous polyphenol oxidase (PPO)
(Jiang et al., 2002). Sulfur dioxide fumigation is used commercially
to solve the problem
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