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Gibberellins Video Lecture | Biology for ACT

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1. What are gibberellins and how do they affect plant growth?

Gibberellins are a group of plant hormones that play a crucial role in regulating various aspects of plant growth and development. They promote stem elongation, seed germination, and flowering. Additionally, gibberellins can also stimulate fruit growth and delay the aging process in plants.

2. How do gibberellins promote seed germination?

Gibberellins break seed dormancy by initiating a series of biochemical reactions within the seed. They stimulate the production of enzymes that break down stored nutrients, such as starch, into sugars that provide energy for seed germination. This process also triggers the elongation of the embryo, leading to the emergence of the radicle and subsequent growth of the seedling.

3. Can gibberellins be used to increase crop yield?

Yes, gibberellins have been widely used in agriculture to enhance crop yield. By promoting stem elongation, gibberellins can increase the height and branching of plants, allowing for more efficient light capture. This hormone also stimulates flower development, leading to increased fruit set and seed production. However, the application of gibberellins should be carefully regulated to avoid negative effects, such as lodging or excessive vegetative growth.

4. Are there any natural sources of gibberellins other than plants?

Yes, gibberellins can be found in certain fungi, particularly those of the Gibberella and Fusarium genera. These fungi produce gibberellins as secondary metabolites, and their presence can affect plant growth. Some plant diseases caused by these fungi, such as bakanae disease in rice, are linked to the overproduction of gibberellins.

5. Can gibberellins be used to induce flowering in non-flowering plants?

In some cases, gibberellins can be used to induce flowering in certain non-flowering plants. By applying gibberellin treatments, it is possible to bypass the natural flowering pathway and promote flower formation. However, the success of this method depends on the specific species and their response to gibberellins. It is important to note that not all non-flowering plants can be induced to flower using gibberellins.

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Sep 21, 2025 Last updated

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