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Unformatted text preview: SOYUN KIM The Effects of Tropisms, Hormone Treatment, and Light Treatment on Plant Growth [Type the document subtitle] X 11/14/2007 [Type the abstract of the document here. The abstract is typically a short summary of the contents of the document. Type the abstract of the document here. The abstract is typically a short summary of the contents of the document.] Introduction A hormone is a chemical messenger that carries a signal from one cell (or group of cells) to another. Plant Hormones control or regulate germination, growth, metabolism, or other physiological activities. Plants - sensitive to the changes in their environment - respond in directional movements called tropisms by the release of hormones. Plants also respond to a particular duration of light and dark hours in a response known as photoperiodism; it is regulated by a blue-green pigment found in the plasma membrane of plant cells, known as phytochrome. This experiment was performed to investigate plant tropisms, as well as the role of auxin in apical dominance and the effects of light on germination. Materials and Methods Experiment 1 14 day-old Raphanus seedlings were grown with a light source positioned to one side of the pot. A lining of moist paper towers was prepared on a cafeteria tray and corn seeds were distributed in different orientations on the paper towels. The seeds were covered with another layer of moist paper towels. A tray was then placed on top of the paper towels to hold the corn seeds in place. After 3 days the trays were removed. We then observed the direction of the roots of each germinating corn seed....
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This note was uploaded on 02/27/2008 for the course BISC 120Lg taught by Professor 11:00-01:50pm during the Fall '06 term at USC.
- Fall '06