Examples of auxin in the following topics:
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- The term auxin is derived from the Greek word auxein, which means "to grow. " Auxins are the main hormones responsible for cell elongation in phototropism and gravitropism.
- While many synthetic auxins are used as herbicides, indole acetic acid (IAA) is the only naturally-occurring auxin that shows physiological activity.
- Auxins also act as a relay for the effects of the blue light and red/far-red responses.
- Commercial use of auxins is widespread in plant nurseries and for crop production.
- Applying synthetic auxins to tomato plants in greenhouses promotes normal fruit development.
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- Most activation occurs on the lit side, causing the plant hormones indole acetic acid (IAA) or auxin to accumulate on the shaded side.
- When the sun is positioned almost directly over the plant, the hormone auxin (pink dots) in the plant stem is evenly distributed.
- As the sun moves, the auxin is repositioned on the other side of the plant.
- This overload of auxin next to these cells causes them to start to grow or elongate, tipping the growth of the stem toward the light.
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- Tendrils of a redvine produce auxin in response to touching a support stick and then transfer the auxin to non-touching cells.
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- In addition to the growth hormones auxins, cytokinins, gibberellins, there are two more major types of plant hormones, abscisic acid and ethylene, as well as several other less-studied compounds that control plant physiology.
- Its activity counters many of the growth-promoting effects of GAs and auxins.
- Strigolactones promote seed germination in some species and inhibit lateral apical development in the absence of auxins.
- Signals between these compounds and other hormones, notably auxin and GAs, amplify their physiological effect.