Microstructure of xylem cells
(a) Paraffin section pictures of WT and OE stem segments. (b) Xylem cell layers of WT and OE. (c) Sections were analyzed by scanning electron microscopy for WT and OE. (d) Secondary wall thickness of xylem fibers of WT and OE. The sections were analyzed from the same stem positions of different plants of the same transgenic line. Data were represented as the mean ± SE of three biological replicates; asterisks indicate levels of significance (t-test; ∗ P < 0.05, ∗∗ P < 0.01).