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24 Cards in this Set
- Front
- Back
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Define Plant Hormone |
A Naturally occurring, organic, chemical messenger that influences growth and development
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Case Studies with Plant Hormones: Darwin |
-1880 -Growth Stimulus is Produced in tip -Growth Stimulus is transmitted to growth zone -Cut off one coleoptile tip, and put an opaque cap on the other. |
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Case Studies with Plant Hormones: Boysen-Jensen |
-1913 -Growth Stimulus Passes through gelatin, but not water impermeable barriers like mica -Mica Sheet inserted on light and dark side. Then, coleoptile cap cut off and gelatin inserted between cap and stump. |
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Case Studies with Plant Hormones: Paal |
-1919 -Growth-Produsing Stimulus is chemical in nature -Tip removed and placed on half of stump. Produces a curve despite the fact that the light is not unilateral in direction. |
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Case Studies with Plant Hormones: Went |
-1926 -The active growth-promoting substance can diffuse into a gelatin block. -Made a coleoptile-bending assay for quantitative auxin analysis |
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Plant Hormones Occur in extremely -------- Concentrations... |
Low! |
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True or False: Each cell in a plant is capable of producing hormones. |
True! |
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Human Made Forms of Plant Hormones are called: |
Plant Growth Regulators (PGR's) |
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Do plants have more or less hormones than animals? |
Less |
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Are plant hormones non-specific or specific? How about animal hormones? |
Plant Hormones: Non-Specific Animal Hormones: Specific |
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Do animal hormones work together? How about plant Hormones? |
Animal Hormones: Do not work together Plant Hormones: Work together! |
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How many Major Groups of Plant Hormones? Name them: |
Five! -Auxins -Gibberellins -Cytokinins -Abscisic Acid -Ethylene |
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Where are Auxins Produced Abundantly? |
In the stem and root apex |
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Describe Auxin Transport |
Polar and Basipetal |
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Influences that Auxin has: |
-Cell Growth -Apical Dominance -Adventitious root formation -Tropic Responses |
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Where are Gibberellins mainly Produced? |
Young Leaves |
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What are Gibberellins known to do? |
-Cause Sudden, rapid cell growth -Stimulate Hydrolysis of starch in germinating seeds |
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Where are Cytokinins Abundantly Produced? |
In the roots! |
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Where are Cytokinins transported to? |
Toward the shoot apex |
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What do Cytokinins Mainly do? |
-Stimulate Cell Division -Release Apical Dominance (Counteracting Auxin) -Prevent Senescence (Counteract ethylene) |
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Where is Abscisic Acid Produced? When is it especially produced? |
-Produced in all parts of the plant, especially under stress. |
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Abscisic Acid Actions: |
-Deepens Dormancy (Seeds and Buds) -Closes Stomata -Probably Not involved with leaf abscission |
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Where is Ethylene Produced? Especially When? |
-All Plant Parts, especially under stress |
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Actions of Ethylene |
-Stimulates Senescence processes (Including Fruit Ripening and Leaf Abscission. |
