Fig. 5.

(A) Transcript levels of PtHMGR gene of P. trichocarpa in mature leaves, young leaves, upper and lower region of stems, roots and petioles. Effect of (B) 200 μm ABA, (C) 200 μm JA, (D) 200 μm SA, (E) 200 mm NaCl, (F) 2 mm H₂O₂, and (G) 10 % PEG₆₀₀₀ on the PtHMGR transcript level. Relative expression was calculated using Actin as an internal reference. Leaves treated with distilled water served as controls. Vertical bars are mean ± s.d. (n = 3). Three independent experiments were performed. *P < 0.05, **P < 0.01, ***P < 0.001.