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The Living World 6th Edition by George Johnson, Jonathan Losos,William Ober,Claire Garrison
النسخة 6الرقم المعياري الدولي: 978-0077280086The Living World 6th Edition by George Johnson, Jonathan Losos,William Ober,Claire Garrison
النسخة 6الرقم المعياري الدولي: 978-0077280086 تمرين 3
Does Auxin Use Ethylene to Inhibit Root Growth
The plant hormone auxin (the name is from the Greek word auxein, "to increase") promotes plant growth. Released at low concentrations from cells at the growing tip of a plant, auxin diffuses downward, causing the stem to elongate. At similarly low concentrations, auxin also promotes elongation of roots, and formation of new roots at cut surfaces. In the photo, the stalk of the leaf on the left sits in a solution of auxin, the one on the right in water. You can see auxin has promoted root growth. However, at high concentrations auxin has quite the opposite effect, inhibiting root growth ( inhibition is the stopping or restraining of a process). It has long been assumed that auxin achieves this inhibition by triggering the production of the plant hormone ethylene, a well-known inhibitor of growth. Supporting this hypothesis is the observation that auxin does stimulate many kinds of plant cells to produce ethylene. But just because the "suspect is present at the scene of a crime" does not prove the suspect is guilty of the crime. Perhaps auxin is directly inhibiting root growth by some unknown mechanism.
The graph to the right displays the results of an experiment designed to test the hypothesis that high concentrations of auxin inhibit root growth by stimulating ethylene production. Seedlings with roots were grown in varying concentrations of auxin, with ethylene assays taken at the end of the experiment. The rate of pea root elongation (blue points) and the production of ethylene in the pea roots (red points) are determined for a range of auxin concentrations. Auxin concentrations are plotted on a log scale (a log or logarithmic scale is a series of numbers plotted as powers of ten; because the scale is exponential [1, 10, 100, 1000 …] rather than linear [1, 2, 3, 4 …], a broad range of values can be visualized on a single graph).
![Does Auxin Use Ethylene to Inhibit Root Growth The plant hormone auxin (the name is from the Greek word auxein, to increase) promotes plant growth. Released at low concentrations from cells at the growing tip of a plant, auxin diffuses downward, causing the stem to elongate. At similarly low concentrations, auxin also promotes elongation of roots, and formation of new roots at cut surfaces. In the photo, the stalk of the leaf on the left sits in a solution of auxin, the one on the right in water. You can see auxin has promoted root growth. However, at high concentrations auxin has quite the opposite effect, inhibiting root growth ( inhibition is the stopping or restraining of a process). It has long been assumed that auxin achieves this inhibition by triggering the production of the plant hormone ethylene, a well-known inhibitor of growth. Supporting this hypothesis is the observation that auxin does stimulate many kinds of plant cells to produce ethylene. But just because the suspect is present at the scene of a crime does not prove the suspect is guilty of the crime. Perhaps auxin is directly inhibiting root growth by some unknown mechanism. The graph to the right displays the results of an experiment designed to test the hypothesis that high concentrations of auxin inhibit root growth by stimulating ethylene production. Seedlings with roots were grown in varying concentrations of auxin, with ethylene assays taken at the end of the experiment. The rate of pea root elongation (blue points) and the production of ethylene in the pea roots (red points) are determined for a range of auxin concentrations. Auxin concentrations are plotted on a log scale (a log or logarithmic scale is a series of numbers plotted as powers of ten; because the scale is exponential [1, 10, 100, 1000 …] rather than linear [1, 2, 3, 4 …], a broad range of values can be visualized on a single graph). Drawing Conclusions Does auxin exert its inhibition of root elongation by stimulating ethylene production](https://d2lvgg3v3hfg70.cloudfront.net/SM1394/11eb9a03_7351_4fcb_b752_87ed1693f234_SM1394_00.jpg)
![Does Auxin Use Ethylene to Inhibit Root Growth The plant hormone auxin (the name is from the Greek word auxein, to increase) promotes plant growth. Released at low concentrations from cells at the growing tip of a plant, auxin diffuses downward, causing the stem to elongate. At similarly low concentrations, auxin also promotes elongation of roots, and formation of new roots at cut surfaces. In the photo, the stalk of the leaf on the left sits in a solution of auxin, the one on the right in water. You can see auxin has promoted root growth. However, at high concentrations auxin has quite the opposite effect, inhibiting root growth ( inhibition is the stopping or restraining of a process). It has long been assumed that auxin achieves this inhibition by triggering the production of the plant hormone ethylene, a well-known inhibitor of growth. Supporting this hypothesis is the observation that auxin does stimulate many kinds of plant cells to produce ethylene. But just because the suspect is present at the scene of a crime does not prove the suspect is guilty of the crime. Perhaps auxin is directly inhibiting root growth by some unknown mechanism. The graph to the right displays the results of an experiment designed to test the hypothesis that high concentrations of auxin inhibit root growth by stimulating ethylene production. Seedlings with roots were grown in varying concentrations of auxin, with ethylene assays taken at the end of the experiment. The rate of pea root elongation (blue points) and the production of ethylene in the pea roots (red points) are determined for a range of auxin concentrations. Auxin concentrations are plotted on a log scale (a log or logarithmic scale is a series of numbers plotted as powers of ten; because the scale is exponential [1, 10, 100, 1000 …] rather than linear [1, 2, 3, 4 …], a broad range of values can be visualized on a single graph). Drawing Conclusions Does auxin exert its inhibition of root elongation by stimulating ethylene production](https://d2lvgg3v3hfg70.cloudfront.net/SM1394/11eb9a03_7351_4fcc_b752_091c0c5c9beb_SM1394_00.jpg)
Drawing Conclusions Does auxin exert its inhibition of root elongation by stimulating ethylene production
The plant hormone auxin (the name is from the Greek word auxein, "to increase") promotes plant growth. Released at low concentrations from cells at the growing tip of a plant, auxin diffuses downward, causing the stem to elongate. At similarly low concentrations, auxin also promotes elongation of roots, and formation of new roots at cut surfaces. In the photo, the stalk of the leaf on the left sits in a solution of auxin, the one on the right in water. You can see auxin has promoted root growth. However, at high concentrations auxin has quite the opposite effect, inhibiting root growth ( inhibition is the stopping or restraining of a process). It has long been assumed that auxin achieves this inhibition by triggering the production of the plant hormone ethylene, a well-known inhibitor of growth. Supporting this hypothesis is the observation that auxin does stimulate many kinds of plant cells to produce ethylene. But just because the "suspect is present at the scene of a crime" does not prove the suspect is guilty of the crime. Perhaps auxin is directly inhibiting root growth by some unknown mechanism.
The graph to the right displays the results of an experiment designed to test the hypothesis that high concentrations of auxin inhibit root growth by stimulating ethylene production. Seedlings with roots were grown in varying concentrations of auxin, with ethylene assays taken at the end of the experiment. The rate of pea root elongation (blue points) and the production of ethylene in the pea roots (red points) are determined for a range of auxin concentrations. Auxin concentrations are plotted on a log scale (a log or logarithmic scale is a series of numbers plotted as powers of ten; because the scale is exponential [1, 10, 100, 1000 …] rather than linear [1, 2, 3, 4 …], a broad range of values can be visualized on a single graph).
Drawing Conclusions Does auxin exert its inhibition of root elongation by stimulating ethylene production
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Growth of plant is promoted by the plant...
The Living World 6th Edition by George Johnson, Jonathan Losos,William Ober,Claire Garrison
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