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How does water uptake enlarge plant cells after cell division?
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Plant development
The life cycle of the fern. (1) Clusters (sori) of sporangia (spore cases) grow on the undersurface of mature fern leaves. (2) Released from its spore case, the haploid spore is carried to the ground, where it germinates into a tiny, usually heart-shaped, gametophyte (gamete-producing structure), anchored to the ground by rhizoids (rootlike projections). (3) Under moist conditions, mature sperm are released from the antheridia and swim to the egg-producing archegonia that have formed on the gametophyte's lower surface. (4) When fertilization occurs, a zygote forms and develops into an embryo within the archegonium. (5) The embryo eventually grows larger than the gametophyte and becomes a sporophyte.
In plant development, cell enlargement following division is a primary driver of growth, allowing cells to increase significantly in volume without further division. This process is facilitated by the uptake of water, which is stored within a central vacuole.12
The mechanism functions as follows:
- Osmotic Intake: Cells actively transport ions and protons into the vacuole, creating a high-concentration solution of salts and sugars. This high concentration draws water into the vacuole through osmosis.2
- Turgor Pressure: As the vacuole expands with water, it generates hydrostatic pressure known as turgor. This pressure pushes against the cell membrane and the cell wall.21
- Cell Expansion: Because the primary cell wall of a growing cell is relatively thin and flexible, the turgor pressure causes the wall to stretch, thereby increasing the cell's length and girth.134
This turgor-induced expansion is essential for plant growth, providing both the force for enlargement and the structural rigidity required for the plant's tissues.123