Fig. 2

Observations of plant cell wall formation in the PtoMYB115 transgenic lines and WT. a Scanning electron microscopy (SEM) images (Xv xylem vessel cells, Xf xylem fiber cells, scale bars as 10 μm). b Cell wall thickness of SEM observation in xylem fiber cells. c Lignin content (% biomass). d Expression of genes involved in lignin biosynthesis. All data as means ± SD. Student’s t-test was performed between the transgenic line and WT as *P < 0.05 and **P < 0.01 (n = 30 in b, n = 3 in c and d)