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Apr4 - Transport in xylem and phloem Why potentials...

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Transport in xylem and phloem Why potentials negative- water potential is zero. Solute potential has to be less than zero b/c flows from high to low. Water high other low, so negative Water transport in xylem Water moves from roots to shoots. Maintain lower water potentials as you go up the plant. Very important that they lose water from leaves b/c they wouldn’t be able to pull water up. Why water flows into plant roots. Saltier than the soil so it flows naturally into the root. Two ways water can flow through plants- cytoplasm(symplastic route), or travel through the cell walls(apoplastic route) Casparian strip - waxy barrier that forces water to go through plant cells. Forces it to go through the symplastic route. By forcing water you can bring up different gates to stop from taking in things the plant does not want. Can choose what they take up into vascular system.
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