It was clear that PAL activity was significantly higher in 1-MCPtreated
fruit than that of the control after 2 days of treatment,
indicating 1-MCP possibly induced resistance (Fig. 4A). In contrast,
PPO activity in 1-MCP-treated fruit showed significantly higher
level compared to the control at the first day after treatment and
there was no significant difference after 2 days of treatment
(Fig. 4B)