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How do auxin promote phototrophism ?
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How do auxin promote phototrophism ?
Auxin and Phototropism
Auxin is a plant hormone that plays a vital role in the growth and development of plants. One of the most well-known effects of auxin is its ability to promote phototropism, which is the bending of plant stems towards a source of light. Here's how auxin promotes phototropism:
1. Perception of Light
When a plant is exposed to light, it triggers a series of biochemical reactions in the plant cells. This leads to the activation of photoreceptor proteins such as phytochromes and cryptochromes, which perceive the light.
2. Redistribution of Auxin
Once the photoreceptors are activated, they trigger the redistribution of auxin in the plant stem. Auxin is transported from the shaded side of the stem to the side exposed to light.
3. Stimulation of Cell Elongation
Auxin promotes cell elongation by loosening the cell walls. When auxin accumulates on the shaded side of the stem, it stimulates the cells to elongate more on that side than on the side exposed to light. This causes the stem to bend towards the light source.
4. Differential Growth
The differential growth of cells on the shaded side of the stem is due to the ability of auxin to activate specific genes that promote cell elongation. Auxin also inhibits the growth of cells on the side exposed to light, which contributes to the bending of the stem towards the light.
5. Gravitropism
Auxin also plays a role in gravitropism, which is the bending of plant roots towards the direction of gravity. In this case, auxin accumulates on the lower side of the root and stimulates the cells to elongate more on that side, causing the root to bend downwards.
Conclusion
In summary, auxin promotes phototropism by redistributing auxin towards the side of the stem exposed to light, stimulating cell elongation on the shaded side, and inhibiting growth on the side exposed to light. This leads to the bending of the stem towards the light source.
Auxin is a plant hormone that plays a vital role in the growth and development of plants. One of the most well-known effects of auxin is its ability to promote phototropism, which is the bending of plant stems towards a source of light. Here's how auxin promotes phototropism:
1. Perception of Light
When a plant is exposed to light, it triggers a series of biochemical reactions in the plant cells. This leads to the activation of photoreceptor proteins such as phytochromes and cryptochromes, which perceive the light.
2. Redistribution of Auxin
Once the photoreceptors are activated, they trigger the redistribution of auxin in the plant stem. Auxin is transported from the shaded side of the stem to the side exposed to light.
3. Stimulation of Cell Elongation
Auxin promotes cell elongation by loosening the cell walls. When auxin accumulates on the shaded side of the stem, it stimulates the cells to elongate more on that side than on the side exposed to light. This causes the stem to bend towards the light source.
4. Differential Growth
The differential growth of cells on the shaded side of the stem is due to the ability of auxin to activate specific genes that promote cell elongation. Auxin also inhibits the growth of cells on the side exposed to light, which contributes to the bending of the stem towards the light.
5. Gravitropism
Auxin also plays a role in gravitropism, which is the bending of plant roots towards the direction of gravity. In this case, auxin accumulates on the lower side of the root and stimulates the cells to elongate more on that side, causing the root to bend downwards.
Conclusion
In summary, auxin promotes phototropism by redistributing auxin towards the side of the stem exposed to light, stimulating cell elongation on the shaded side, and inhibiting growth on the side exposed to light. This leads to the bending of the stem towards the light source.
Community Answer
How do auxin promote phototrophism ?
by division of cells where more auxin is present . cells get concentrated in one part causing the other part to bend down thus showing photo tropism
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How do auxin promote phototrophism ?
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