Uptake of water- xylem
- Created by: katie
- Created on: 23-03-13 16:14
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- Uptake of water- xylem
- water absorbed by the root hair cells
- water can be absorbed into and moves through cell walls
- moves across cortex via apoplast route
- can also move across plasma membrane, into cytoplasm by osmosis
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water moves from the cytoplasm of one cell to the next via plasmodesmata
- called the symplast route
- water can also move through cytoplasm and vacuoles via vacuolar route
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Casparian band in walls of endodermal cells
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made of waterproof Suberin
- stops apoplast route / water forced into symplast route
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made of waterproof Suberin
- ions absorbed into root hair cells by active transport
- Ions lowering water potential in root hair cells
- at the endodermis ions absorbed into cytoplasm by active transport
- ions travel through pericycle into xylem
- lowers water potential in xylem
- lower water potential in root hair cells or xylem increasing osmotic gradient between soil solution and cell contents creates osmotic gradient across root
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