Figure 3.

PG enzyme activity in leaves from plants expressing an antisense PG β-subunit gene compared with wild-type plants. PG enzyme assays were performed on leaf extracts from at least two randomly selected, non-necrotic symptomatic leaves from each plant. Values are the average values (±sd) of three measurements per plant. A unit of PG was defined as the amount that caused a 0.1 OD increase at 520 nm per 30 min at 37°C per 0.1 g fresh weight. All assays were repeated three times in duplicate.