Both lignin and cellulose are found in the rigid cell walls of the xylem cells (those that conduct water) in the primitive plant, Selaginella. Zina Deretsky, National Science Foundation ...

Xylem cell They transport water and minerals up the stem to leaves and flowers. Dead cells are joined end to end to form a continuous tube. They have no cytoplasm. Their walls contain lignin for ...

Figure 4: Effects of GA 20-oxidase overexpression on (A) cell length (B) cell number per internode (C) number of xylem fibers, and (D) xylem fiber length. GA 20-oxidase appears to be key enzyme in ...