which plant hormone plays a role in apical dominance in plants?

Question

Answer

The apical bud produces an auxin(IAA) that inhibits growth of the lateral buds further down on the stem towards the axillary bud. It was first discovered in 1934 that the plant hormone auxin likely regulates apical dominance.

Answer

Auxin is a plant hormone produced in the stem tip that promotes cell elongation. ... Auxin also plays a role in maintaining apical dominance. ...

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Auxins promote stem elongation, inhibit growth of lateral buds (maintains apical dominance). They are produced in the stem, buds, and root tips. Example: Indole Acetic Acid (IA). Auxin is a plant hormone produced in the stem tip that promotes cell elongation.

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Auxin

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The plant hormone auxin likely regulates apical dominance. Auxin is predominantly produced in the growing shoot apex and is transported throughout the plant via the phloem and diffuses into lateral buds which prevents elongation

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Auxin

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Auxin is a growth promoter that helps in apical dominance

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Auxin

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Auxin...
becoz it is a growth supporter..

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Auxins

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Auxin plant hormone plays a role in the apical dominance in plants.

Answer

Plant Hormone Responsible for Apical Dominance in Plants

Introduction
Apical dominance is a phenomenon in plants where the growth of lateral buds is suppressed by the presence of an actively growing apical bud or shoot tip. This ensures that the plant's energy is focused on the growth and development of the main shoot. Plant hormones play a crucial role in regulating apical dominance, and one hormone in particular stands out in this process.

Auxin - The Key Player
The plant hormone auxin, specifically indole-3-acetic acid (IAA), is primarily responsible for apical dominance in plants. Auxin is synthesized in the apical meristem, the actively dividing cells at the tip of the shoot, and is transported downwards towards the base of the plant. Here are the key points regarding the role of auxin in apical dominance:

1. Inhibition of Lateral Bud Growth
- Auxin is primarily synthesized in the apical bud, and high concentrations of auxin are found in this region.
- As auxin is transported downwards, it inhibits the growth of lateral buds by suppressing their development and elongation.
- This inhibition occurs by promoting the production of cytokinins in the apical bud, which further inhibits the growth of lateral buds.

2. Apical Dominance Mechanism
- The presence of auxin in the apical bud suppresses the growth of lateral buds by inhibiting the expression of genes responsible for their development.
- Auxin inhibits the outgrowth of lateral buds by reducing the levels of auxin transporters, which are essential for lateral bud development.
- Additionally, auxin induces the production of strigolactones, another class of plant hormones that further inhibit lateral bud growth.

3. Basipetal Auxin Transport
- Auxin is transported in a polar manner from the shoot apex towards the base of the plant through the phloem and polar auxin transporters.
- This basipetal auxin transport creates a concentration gradient, with higher levels at the apex and lower levels in the lower parts of the plant.
- The concentration gradient of auxin helps maintain apical dominance, as higher levels of auxin in the apical bud inhibit lateral bud growth.

Conclusion
In conclusion, auxin plays a crucial role in apical dominance in plants. It inhibits the growth of lateral buds by suppressing their development and elongation through various mechanisms. The basipetal transport of auxin from the apical bud towards the base of the plant creates a concentration gradient, further maintaining apical dominance. Understanding the role of auxin in apical dominance is essential for horticultural practices such as pruning and shaping plants to achieve desired growth patterns.

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