Figure 3.

Stem cross sections of five T-DNA mutant lines presenting either hypo or hyperlignified SCWs. Sections of wild-type plant and T-DNA mutants were observed under UV light (A–F) or stained with phloroglucinol-HCl (G–L). Phloem cap cells and ectopic lignification in epidermal cells are indicated by blue and pink arrows, respectively. Observations were made at the basal part of inflorescence stems at the stage of newly formed green siliques, about two weeks after bolting, when the inflorescence stems reached 20 cm height. if, interfascicular fiber; xf, xylary fiber; mx, metaxylem; px, protoxylem; sx, secondary xylem; ep, epidermis. Scale bar: 20 μm.