formallabreport1 - 1 Pages Plant Hormones and Responses...

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1 Pages Plant Hormones and Responses Introduction Plant hormones are chemicals vital to all plants in order for them to grow and live successfully. They regulate growth, shape the plant, effect seed growth, time of flowering, the sex of flowers, longevity, aging of leaves and fruits, geotropism of tissue growth, leaf and stem growth, and ultimately, death of the plant. Response to plant hormones can be determined by many factors as well, such as concentration, the surrounding environment, the tissue, or other present hormones. The dominant kinds include auxin, gibberellins, cytokinins, abscisic acid, and ethylene. Auxin controls several factors consisting of tropisms, ethylene production, cell elongation, and apical dominance. Gibberellins, produced in young leaves, affect stem length and stimulate cell division. Cytokinins are a group of chemicals important to leaf and shoot meristem growth, as well as fruits and seeds. Abscisic acid, mainly found in freshly fallen leaves is a growth inhibitor aiding dormancy in shoots and seeds, and is essential in water conservation. Finally, ethylene offsets auxin and helps to produce the enzyme that ripens fruit. In this laboratory activity, the objective was to observe three experiments of hormone response in plants. This included plant tropisms, or directional movement in response to gravity and light, the role of auxin in apical dominance, or the inhibiting effect of a terminal bud upon axillary bud development, and lastly the effect of light on germination. Materials and Methods In the first experiment, slides of cyanobacteria, specifically Anabaena , were observed in order to perceive an understanding of its structure, colors, and features, all of
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2 Pages which are important to its function. In the second experiment, basic bacterial forms were examined and studied by viewing a prepared slide under oil immersion as well. In the
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This note was uploaded on 02/27/2008 for the course BISC 120 taught by Professor Webb,wetzer,? during the Fall '07 term at USC.

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formallabreport1 - 1 Pages Plant Hormones and Responses...

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