BIOL 1130 Lecture Notes - Acetic Acid, Indole, Auxin
27 Sep 2013
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Transpiration water is lost by evaporation at the leaf surface. Stoma must be open to lose water. Wp will be made lower by active transport of k+ ions into the guard cells. Causes the cells to become turgid and the small openings (stoma) are evident. 1 corn plant transpires an average of 15 l/week. For stoma to close k+ ions flow out of the guard cells wp outside is lower and h2o flows out of guard cells and stoma are closed. Method of relieving water pressure in the plant xylem during darkness. Specialized cells hydathunder located at tips of leaves of specific plants. Sugars flow from the source (leaves) to where needed (sink) Sugars enter sieve tube by active transport (needs energy) Will cause wp to decrease and h2o flows into the tubes. Location where sugars will be removed (actively) Causes the wp to decrease outside the sieve tubes and h2o flows out and h2o diffuses back to the xylem.
