Abstract
An antibody raised against apple polyphenol oxidase (PPO) cross-reacted with PPOs from Japanese pear ( Pyrus pyrifolia), pear ( Pyrus communis), peach ( Prunus persica), Chinese quince ( Pseudocydonia sinensis) and Japanese loquat ( Eriobotrya japonica). Core fragments (681 bp) of the corresponding PPO genes were amplified and characterized. The deduced protein sequences showed identities of 85.3 to 97.5%. Chlorogenic acid oxidase activity of these PPOs showed higher activities when assayed at pH 4 than at pH 6. These results indicate that PPOs in Rosaceae plants are structurally and enzymatically similar.
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