Figure 5.

PAG transcript levels declined after treatment with O₃. Fifteen-day-old Arabidopsis plants were exposed to 0.15 μL L⁻¹ O₃ for 6 h d⁻¹ or remained nontreated. Samples were prepared as in Figure 3. A, Each lane contains RNA extracted from the fifth and sixth leaves pooled from six plants. The samples shown are one representative replicate from a total of three. B, Each lane contains RNA extracted from one rosette and only one replicate was analyzed. C, Control, nontreated plants; O₃, O₃-treated plants.