Plant Nutrition and Nutrient Uptake

Plant Nutrition and Nutrient Uptake - 1.) Mass of...

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1.) Mass of trees/plants mostly comes from CO 2 2.) Nutrient Transport at cellular level: Xylem: adhesion cohesion, phloem through pressure flow. How do plants transport at cellular level. a. Apoplast transport pathway: aka cell wall. Diffuse nutrient out, and reuptake at next cell. Symplast, transport through plasmodesmata. b. Once you hit endodermis, it can’t just “pass” into or through endodermis, endodermis has to uptake nutrients. Casparian strip is the “tight junction” 3.) Types of Transport a. Water uptake: osmotic flow: aquaporins b. Channels: passive transport for ions, there is a gradient that will provide a given amount of “free flow”. Nernst equation c. Carrier or pump: active transport against electrical and chemical gradient 4.) Active transporter that chargers up gradients: Sodium potassium pump. a. Plants pump protons from inside of the cell to outside of the cell to generate membrane potential. So inside is also less acidic than outside. pH of cell wall ~5.5., 7.5 pH inside 100x gradient. This is diff from Na K pump. In plants, inside cell = -120 mV. b. This allows you to uptake positively charged nutrients. Calcium, magnesium, potassium. (because inside cell = negative, outside is positive) c. If you have -120 mV, calculate how much uptake you can have for potassium. d. How do you uptake a nuetrient with a negative charge like nitrate or phosphate? d.i.
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This note was uploaded on 01/10/2012 for the course BIOLOGY bild 2 taught by Professor Schroeder during the Fall '09 term at UCSD.

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Plant Nutrition and Nutrient Uptake - 1.) Mass of...

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