Secondary plant substance

Definition

Chemicals produced by plants that are not directly involved in growth or development, often serving as defenses against herbivores or other biotic stresses.

Etymology

From the Latin 'secundarius', meaning 'second', indicating their secondary role beyond primary metabolic functions.

Example

Alkaloids like nicotine and caffeine are examples of secondary plant substances that deter herbivores.

Related Terms

• Defense mechanisms
• Phytochemistry
• Chemical defenses
• Allelopathy

Usage Notes

Secondary plant substances can be grouped into various classes based on their chemical structure and function. Their production can be influenced by environmental factors such as herbivore pressure.