Development of xylem

Development of xylem

• The cell undergoes cell elongation by osmotic uptake of water leading to irreversible expansion of the cell wall
• The horizontal end walls break down partially or completely so that the cells is in open communication with the neighboring cell
• The cellulose side walls become impregnated with lignin, making them impermeable to water solutes.
• The protoplasmic contents of the cell die, leaving a hollow tube.
• Its lignified walls become perforated with numerous pits in places where lignin is not deposited
• These pits may bordered by a lignified rim, making them bordered pits
• As the cell develop, lignified ribs of different types are laid down on the immediate inside of the walls. This leads to spiral and annular thickening.
• The cell has now developed into a xylem vessel element.

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