Gibberellic acid

Definition

Gibberellic acid is a plant hormone belonging to the gibberellin family, which plays a crucial role in regulating various growth and developmental processes in plants. It promotes stem elongation, seed germination, and flowering, and is essential for breaking dormancy in seeds. Gibberellic acid works in conjunction with other plant hormones such as auxins and cytokinins to coordinate growth responses in plants.

5 Must Know Facts For Your Next Test

1. Gibberellic acid was first discovered in the 1930s when researchers identified its role in promoting rapid growth in rice seedlings infected with the fungus Gibberella fujikuroi.
2. It is commonly used in agriculture to enhance crop yields by promoting seed germination and preventing premature aging of fruits.
3. Gibberellic acid acts by promoting the synthesis of enzymes necessary for breaking down starches into sugars during seed germination, providing energy for the growing plant.
4. The hormone can also influence flower development and fruit set, leading to increased fruit size and improved quality.
5. In some plants, gibberellic acid is involved in the regulation of photoperiodic responses, helping plants adapt to changing light conditions.

Review Questions

• How does gibberellic acid interact with other plant hormones like auxins and cytokinins to influence plant growth?
  • Gibberellic acid works closely with auxins and cytokinins to coordinate various aspects of plant growth. While gibberellic acid primarily promotes stem elongation and seed germination, auxins are responsible for regulating cell elongation and root development. Cytokinins stimulate cell division and are particularly important for shoot development. Together, these hormones create a balanced hormonal environment that enables plants to grow effectively in response to environmental cues.
• Discuss the agricultural applications of gibberellic acid and its impact on crop production.
  • Gibberellic acid has several agricultural applications that significantly enhance crop production. It is widely used to improve seed germination rates, especially in crops that require specific conditions to break dormancy. Additionally, it helps increase fruit size and improves overall fruit quality by delaying senescence. By optimizing these growth processes, gibberellic acid helps farmers achieve higher yields and better marketable produce.
• Evaluate the significance of gibberellic acid's discovery in the 1930s on modern plant physiology research and agricultural practices.
  • The discovery of gibberellic acid in the 1930s marked a pivotal moment in plant physiology research, leading to a greater understanding of hormonal regulation in plants. This breakthrough opened up new avenues for exploring how different hormones interact to control growth and development. Furthermore, it paved the way for innovative agricultural practices that utilize gibberellic acid to enhance crop yields and improve food production efficiency. As a result, modern agriculture has benefited greatly from insights gained from studying gibberellic acid and its functions.

Related terms

Auxins: A group of plant hormones that primarily regulate cell elongation and are involved in various developmental processes like apical dominance and root formation.

Cytokinins: Plant hormones that promote cell division and shoot formation, often working alongside auxins to regulate plant growth and development.

Gibberellins: A class of plant hormones that includes gibberellic acid, responsible for stimulating growth processes such as stem elongation, seed germination, and flowering.