BIOL 1030 Lecture Notes - Xylem, Stoma, Transpiration

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BIOL 1030 Full Course Notes
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BIOL 1030 Full Course Notes
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Water & minerals are transported in the xylem vessels & tracheids: direction is upward from root to leaf, 2 mechanisms. Symbol for potential is the greek letter psi ( ) - a measure of the tendency of water to move along its concentration gradient. Is most commonly measured in megapascal (mpa) Root pressure: water & minerals are pushed up the plant body, occurs at night, when stomata are closed - no transportation, mechanism: endodermis of the root. Active transport of minerals by the endodermis into the root vascular cylinder. Increase in root xylem solute concentration: h2o moves into the root xylem from the soil. Phloem transport of sugars: translocation - transport of sugars (sucrose) by sieve tubes (st) of phloem from source to sink, source - photosynthesis in a mature leaf, sink - a region of utilization such as: Owers, cones, seeds, nutritive tissue (3n or n) A di erence in hydrostatic pressure between the source & the sink.

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