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Week 8 Lecture Notes

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Week 8 Lecture Notes 103

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Just covers Friday, since we had the test on Wednesday. Talks about hormones
Life 103- Biology of Organisms
Tanya Dewey
Class Notes
Week 8 notes, life 103, spring semester, 2016
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This 2 page Class Notes was uploaded by Notetaker on Friday March 11, 2016. The Class Notes belongs to 103 at Colorado State University taught by Tanya Dewey in Winter 2016. Since its upload, it has received 20 views. For similar materials see Life 103- Biology of Organisms in Biology at Colorado State University.


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Date Created: 03/11/16
Week 8 lecture notes Hormones Auxin -elongation in coleoptiles -type of auxin IAA acid most common -hormone at the basal end of plant Expansin -cell elongation -cellular wall’s are loosened by the enzymes Cytokinin -works with Auxin -stimulates cytokinesis -fruit, roots, embryos Control of Apical Dominance -cyotkinins, auxins, and others work together to hinder the development of axillary buds -plants can become bushier if the terminal bud is taken off Gibberellins -Stem and leaf elongation and division Fruit growth -need auxin and gibberellins Germination -when gibberellins is released, it signals for the seed to germinate Brassinosterieds -kind of like animal sex hormones -stimulated cell elongation and division Abscisic Acid -hinders growth -aids in dormancy -heavy rain, light, or cold can get rid of ABA Ethylene -a gas produced by plants in time of stress -stressors  drought, flooding, pressure, infection Effects of ethylene -senescence -cells and organs die -apoptosis programmed destruction -leaf abscission -altered balance of auxin -fruit ripening -caused by a rapid increase of ethylene Triple response to mechanical stress -Stem elongation slows down -Stem thickens for structural support -Grows horizontally Light and plants -light cues help enable stages of plant growth Photomorphogenesis plant morphology that’s effected by light Action spectrum response to various wavelenths Classes of Light Receptors Blue-light photoreceptors -controls hypocotyl elongation -control stomatal openings -control phototropism Phytochromes -pigments -plant’s response to light


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