Biostimulants
Terpenoids
Terpenoids form a very large and diverse group of secondary metabolites in plants. They are responsible for scent, taste, and volatile signals and play a central role in defense, communication, and adaptation to environmental stress.
What are terpenoids?
Terpenoids are organic compounds composed of isoprene units. Variation in length and structure results in a broad group of substances with diverse physiological functions in plants.
- Occurs in almost all plant species
- Can be volatile or non-volatile
- Stored in specialized tissues
- Quickly formed during stress or damage
Main groups of terpenoids
Monoterpenes
Monoterpenes are often volatile and responsible for aroma and taste. They play a role in defense against insects and communication with pollinators.
Sesquiterpenes
Sesquiterpenes are involved in chemical defense and often function as signaling compounds during herbivore or pathogen attack.
Diterpenes
Diterpenes fulfill both structural and regulatory functions and are involved in growth and protection.
Triterpenes
Triterpenes contribute to membrane stability and protection of cell structures.
Functions of terpenoids in plants
Defense against insects and pathogens
Many terpenoids are deterrent or toxic to insects and inhibit the growth of fungi and bacteria.
Communication and signaling
Volatile terpenoids act as signaling molecules that warn neighboring plants or attract natural enemies of herbivores.
Protection against abiotic stress
Under conditions such as heat, drought, and UV radiation, the production of terpenoids increases to protect cellular structures.
Role in growth and development
Some terpenoids are involved in the regulation of growth, cell differentiation, and tissue development.
Terpenoids and interaction with the environment
Terpenoids influence interactions with insects, microorganisms, and other plants. They play a key role in ecological networks and adaptive strategies.
Effect of terpenoids on plant performance
A well-functioning terpenoid system contributes to:
- Increased resilience
- Improved stress tolerance
- Effective communication
- Stable growth under changing conditions
Overview: role of terpenoids
| Process | Effect of terpenoids |
|---|---|
| Defense | Deterrence and inhibition of attackers |
| Communication | Signaling to plants and insects |
| Stress protection | Stabilization of cellular structures |
| Growth | Regulation of developmental processes |
| Ecology | Interactions within ecosystems |