What are phytohormones? Give examples of these hormones and at least one function.

Phytohormones, also known as plant hormones, are natural substances produced by plants that regulate various aspects of growth and development. These hormones play crucial roles in processes such as cell division, elongation, and responses to environmental stimuli.

Types of Phytohormones

• Auxins: These hormones promote cell elongation and are involved in root formation.
• Gibberellins: They stimulate stem elongation, seed germination, and flowering.
• Cytokinins: These promote cell division and can delay aging in plants.
• Abscisic Acid (ABA): This hormone helps plants respond to stress, such as drought, by closing stomata.
• Ethylene: Known for regulating fruit ripening and flower wilting.

Key Functions

Each type of phytohormone has specific functions. For instance, auxins are vital for the growth of roots and shoots, influencing how plants respond to gravity and light. Gibberellins, on the other hand, are essential for breaking dormancy in seeds and promoting flowering in certain plants.

In summary, phytohormones are essential for plant health and development, influencing a wide range of physiological processes.