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CSU - BC 103 - Life 103 Week 8 - Class Notes

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CSU - BC 103 - Life 103 Week 8 - Class Notes

School: Colorado State University
Department: Biology
Course: Biology of Organisms-Animals and Plants
Professor: Jennifer Dewey
Term: Fall 2016
Tags: Biology
Name: Life 103 Week 8
Description: Plant responses to signals and important plant hormones
Uploaded: 03/11/2016
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background image Plant Responses to Signals stages of cell signal processing reception: internal/external signals detected by receptors
transduction: second messengers transfer and amplify signals from receptors 
to proteins, changing their shape response: signal transduction pathway—>regulation of cellular activities plant hormones - chemical signals that modify or control physiological processes  —help coordinate growth, development, and responses to stimuli
—produced in low concentrations
—can alter gene expression, enzyme activity, and membrane properties
examples of plant hormones auxins: promote elongation of shoots
cytokinins: stimulate cytokinesis, control of cell division and apical dominance 
(if apical bud is removed, plants become bushier) gibberellins: stem elongation (bolting) and seed germination
ethylene: gas produced in response to mechanical stress (triple response), 
involved in fruit ripening A. fruit producers can control ripening by controlling ethylene levels in  green fruit responses to light are critical for plant success —light can provide info about growth opportunity and time of day/year
phytochromes: pigments that regulate responses to light 
A. seed germination
B. shade avoidance - shaded plant induced to grow vertically
circadian rhythms - 24 hour cycles governed by internal clock and set by day/night 
cycle
photoperiodism short day plants: plants that flower when day is shorter than critical length
long day plants: plants that flower when a day is longer than critical length
—responses to photoperiod controlled by night length
plants respond to different stimuli —gravitropism: response to gravity, can be positive (roots grow down) or  negative (shoots grow up) —thigmotropism: growth in response to touch environmental stresses —drought: plants reduce water loss by closing stomata
—flooding: air tubes to survive oxygen deprivation
—heat: synthesis of heat shock proteins
—cold: synthesis of antifreeze proteins and adjustment of membrane fluidity 
responses to pathogens —epidermis and periderm barrier is first line of defense
—pathogens can enter through wounds or stomata

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School: Colorado State University
Department: Biology
Course: Biology of Organisms-Animals and Plants
Professor: Jennifer Dewey
Term: Fall 2016
Tags: Biology
Name: Life 103 Week 8
Description: Plant responses to signals and important plant hormones
Uploaded: 03/11/2016
2 Pages 4 Views 3 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
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