While it's difficult to give a definitive number, plants have at least five major types of hormones, also known as phytohormones, and several other classes that affect physiological processes.
Here's a breakdown:
-
Five Major Phytohormones: These are the most well-studied and generally recognized classes.
- Auxins
- Gibberellins
- Cytokinins
- Ethylene
- Abscisic Acid
-
Other Important Phytohormones: Several other classes of hormones play crucial roles in plant development and responses to the environment. Examples include:
- Brassinosteroids
- Salicylates
- Jasmonates
- Strigolactones
It is important to note that research into plant hormones is ongoing, and new phytohormones or classes of compounds with hormonal activity are still being discovered. Therefore, the exact number is constantly evolving. Additionally, some substances may act as hormones in specific contexts, blurring the lines of a strict classification.
