Gibberellins

Definition

Gibberellins are a group of plant hormones that regulate growth and influence various developmental processes, including stem elongation, germination, and flowering. They play a crucial role in breaking seed dormancy and promoting growth under favorable conditions.

5 Must Know Facts For Your Next Test

1. Gibberellins promote stem elongation by stimulating cell division and elongation.
2. They are essential for the germination process by activating enzymes that mobilize nutrient reserves in seeds.
3. Gibberellins can break dormancy in seeds and buds, enabling plants to resume growth.
4. These hormones also play a role in the regulation of flowering time and fruit development.
5. The most common gibberellin in plants is Gibberellic Acid (GA3).

Review Questions

• What roles do gibberellins play in seed germination?
• How do gibberellins affect stem elongation?
• Name one specific gibberellin commonly found in plants.

Related terms

Auxins:

Plant hormones that primarily regulate cell elongation and are involved in phototropism and gravitropism.

Cytokinins: Plant hormones that promote cell division and delay aging of leaves.

Abscisic Acid (ABA): A plant hormone involved in stress responses, such as drought tolerance, and regulating seed dormancy.