Elicitor

An **elicitor** is a stimulus, often of biological or chemical origin, that triggers a specific response within an organism, particularly within plants and animals, resulting in activation of defense mechanisms or physiological changes. These stimuli can be derived from pathogens, environmental stressors, or other external influences. Elicitors are essentially signal molecules that initiate a cascade of events leading to the production of defensive compounds, changes in gene expression, or altered cellular behaviors. The impact of an elicitor is highly specific and can significantly influence the health, growth, and overall function of an organism.

Elicitor meaning with examples

• When a plant is attacked by a fungal pathogen, the fungus releases **elicitors** that bind to plant receptors, initiating a defense response. This often involves the production of phytoalexins to combat the infection.
• Chitin fragments, derived from the cell walls of insects and fungi, act as potent **elicitors** in plants, triggering immune responses that protect against herbivory and pathogen attack, resulting in stronger defenses.
• In aquaculture, certain chemicals are added to trigger the immune system in fish. These are **elicitors** designed to activate their defense mechanisms which reduces susceptibility to diseases and parasites.
• Researchers often use synthetic **elicitors** in laboratory settings to study plant defense mechanisms. This allows them to investigate the specific pathways and genes involved in the organism's response to stress.