Lecture 10

Lecture 10 - Lecture 10 Transport in Plants Nutrient uptake...

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Lecture 10 Transport in Plants Nutrient uptake in plants o What do plants need to grow? Maintain water, nutrient, energy balance o CO 2 gas is exchanged along with O 2 and H 2 O in leaves Photosynthesis produces sugars from CO 2 and H 2 O o Roots take up minerals and H 2 0 o Where are water and nutrients needed? Uptake and transport o Gas exchange (CO 2 ,H 2 O,O 2 ) from air o Mineral (nitrate, phosphate) H 2 O from soil Transport H 2 O etc. from roots to leaves Transport sugars from leaves to roots o Gas exchange tied to transport o Uptake and transport in plants rely on the unique properties of water Cohesion/adhesion Osmosis Water potential o Solute water potential: Ψ s is a measure of the osmotic strength of a solution o Solute concentration determines Ψ s Pure water has Ψ s =0 Increase solute concentration = lower Ψ s o Predicts direction of water flow (osmosis) o Water moves from an area of high Ψ s to an area of low Ψ s o Water potential regulates the movement of fluids in plants Figure 38.3
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Lecture 10 - Lecture 10 Transport in Plants Nutrient uptake...

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