Fig. 7. Effect of phosphinothricin (PPT) on the chlorophyll content and PgGST expression in transgenic tobacco leaves (T2). Total chlorophyll content from leaf discs of wild-type and transgenic plants treated with 0.1, 1, 10, 100, or 1,000 mM of PPT for 4 h (A) and 24 h (B) was analyzed. Means (±SE) are for 10 replicates per treatment. Averages for treated samples were significantly different compared to the control at *p<0.01. PgGST expression by PPT (0.1, 1, 10, 100, or 1,000 mM) for 4 h was performed by reverse transcriptase polymerase chain reaction (C).