Abstract: This article was to study the activities of polyphenol oxidase、peroxidase and peroxidase isozymogram in the leaves of Avicennoa marina and Kandelia candel growing at Aotou, Renshan and Shanmen island nearby Daya Bay. It was found that the activities of polyphenol oxidase in the leaves for these two mangrove plants at Aotou, Renshen, Shanmen island decreased one by one, but the activities of peroxidase increased. The height and number of peak for peroxidase isozymogram were different from each other but had no regulation at these three regions.

Key words: Mangrove plant, Polyphenol oxidase, Peroxidase, Daya Bay