Figure 1.

Alteration of PPO activity in response to 10 mM (A), 100 mM (B) and 200 mM (C) catechol in leaves of Basella alba during cold acclimation. The plants were exposed to 8 °C for 24 h, 48 h and 72 h in cold chamber, however, the respective controls were used without any cold acclimation. After the treatments, the leaves of plants and their respective controls were used for the assay of PPO activity. The results are expressed as percentage of the respective controls.