Biology 2601A/B : Lynden Rodrigues
23 Dec 2012
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Document Summary
Gibberellins make up a large family of stucturally related. Gibberellic acid (ga3: giberellin that appears to promote cell elongation, Cytokinins are a group of plant hormones that promote cell division. Cytokinins are synthesized in root tips, young fruits, seeds, Cytokinins regulate growth by activating genes that keep the cell cycle going. When lacking cks, cells arrest at g1: cell cycle stops, stop growing. Involved with elongation in the dark (etoliation) Produced in the apical meristems and young leaves (apical dom. ) The transport is polar: produced in the ap. Meris. and travels top to bottom to the root were it will then move slightly upwards: apical to basal end in cells, cotransporters at top of cells bring auxin in. Carrier proteins at bottom of cell send auxin out. Some auxin is destroyed in the process. The ph between cytosol and cell wall is different. Ph within cell is lowered by pumping protons out using atp.
