Chapter 35 Transport in Plants

Chapter 35 Transport in Plants - Chapter 35 Transport in...

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Chapter 35 Transport in Plants 35.1 Water uptake in plants -roots provide water, minerals, in exchange for carbohydrates Osmosis: - osmosis happens when there’s a difference in osmolarity - pressure potential- called turgor pressure in plants - Ψ = Ψ s + Ψ p - Water moves to region of lower water potential - Physical structure of plants due to positive pressure potential - Main driving force of water in xylem due to pressure potential, called bulk flow Aquaporris - transport proteins - permeability of membrane changes rate, not direction of water flow Uptake of Mineral Ions - need channels and transport proteins - voltage gated ion channels also used - symports used to take up minerals Water and Ions Pass Xylem Through Apoplast and Symplast - water flow transports ions - cell walls outside of plasma membrane and intercellular; meshwork with no membrane - symplast- continuous cytoplasm of living cells connected by plasmodesmata- control access to symplast - endodermis has casparian strips - waxy subin regions, hydrophobic -
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