BIOL 1130 Lecture Notes - Flowering Plant, Photosynthesis, Gravitropism
27 Sep 2013
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Gibberellins: can promote enlargement at cells and increase in growth, stems bolting, application to spray fruits and enlarge them (grapes) G. a. promotes breakdown of the endosperm in seeds to produce sugars which are then available to the germinating embryo. Block the effects of various growth hormones. Functions as 3 kinds: inhibits cell growth, inhibits seed and bud germination, regulate stomatal opening. Effects: enlargement of cells, apical dominance, tissue differentiation. Major application micropropogation or tissue culture and ratio of cytokinens to auxins determines the tissue produced. Example roots, shoots, callas (undifferentiated tissue) Produced naturally in plants (fruits) and triggers its own production. Functions: rippens fruit: responds to mechanical stress. Example where touched, ethylene produced and the shoot(or root) will bend because growth is slowed due to ethylene and normal growth occurs opposite to where touched: abscission of leaves. Normal process: perception from an external source (light) Wednesday november 28, 2012: transduction whereby a hormone becomes an evenly distributed.
