Fig. 1

Phenotype of transgenic lines with an OsSWN1 construct. A Representatives of 4-month-old wild-type and transgenic poplar plants grown under culture room conditions. Two plants each of the same line are placed in tandem. From left to right: Wild-type, hpCAD19, lines #E, #B, #C, and #G plants. At 4 months, the height of plants #C and #G were significantly lower than that of the background line (hpCAD19) (P < 0.05 and P < 0.01, respectively). A statistical difference was determined by one-way ANOVA followed by Tukey–Kramer multiple comparison tests. B Dried debarked stems prepared from plants of each line. From left to right, wild type, hpCAD19, lines #B, #C, #E, and #G (three independent samples each). In contrast to the whitish color of the wild-type wood (the leftmost three samples), wood from the transgenic lines with a CAD-RNAi construct (hpCAD19, lines #B, #C, #E, and #G) exhibited a brownish color