Terpenes

Definition

Terpenes are a large and diverse class of organic compounds produced by various plants, particularly conifers, and are known for their strong aromatic qualities. They play a critical role in plant defense mechanisms by deterring herbivores, attracting pollinators, and protecting against pathogens. Terpenes also contribute to the distinctive scents and flavors of many fruits and herbs, making them essential not only for plant survival but also for human use in food and medicine.

5 Must Know Facts For Your Next Test

1. Terpenes can be classified into monoterpenes (C10) and sesquiterpenes (C15), with different structures leading to varying functions and aromas.
2. Some common terpenes include limonene, pinene, and myrcene, each with unique scents and potential health benefits.
3. Plants may produce more terpenes in response to environmental stressors, such as herbivore attacks or pathogen infections, enhancing their defense mechanisms.
4. The ability of terpenes to attract predatory insects that prey on herbivores is a key factor in the indirect defense strategy of many plants.
5. In addition to their ecological roles, terpenes have found applications in aromatherapy, perfumery, and even in the pharmaceutical industry due to their therapeutic properties.

Review Questions

• How do terpenes contribute to a plant's defense mechanisms against herbivores?
  • Terpenes contribute to a plant's defense mechanisms by deterring herbivores through their strong odors and sometimes toxic properties. These compounds can make the plant less palatable or even harmful if consumed. Additionally, certain terpenes attract natural predators of herbivores, enhancing the plant's protection by enlisting help from other organisms in the ecosystem.
• Compare the roles of terpenes and flavonoids in plant defense strategies.
  • Both terpenes and flavonoids serve vital roles in plant defense strategies but do so through different mechanisms. Terpenes primarily deter herbivores and attract pollinators with their strong scents, while flavonoids can provide UV protection and act as antioxidants. Together, these secondary metabolites work synergistically to enhance a plant's overall resilience against various biotic stresses.
• Evaluate the importance of terpenes beyond their ecological functions in plants, considering their applications in human industries.
  • Terpenes are important not only for their ecological functions in plant defense but also for their diverse applications in human industries. In aromatherapy and perfumery, terpenes provide distinctive scents that are valued for their calming or stimulating effects. Moreover, many terpenes possess potential medicinal properties, making them significant in the pharmaceutical industry for developing natural remedies and health products. Their multifunctional roles demonstrate how interconnected plant biology is with human needs.

Related terms

Essential Oils: Concentrated extracts from plants that contain volatile compounds, including terpenes, and are often used for their fragrance or therapeutic properties.

Flavonoids: A group of plant metabolites that contribute to the color and flavor of plants, often working alongside terpenes to enhance plant defense and attract beneficial organisms.

Secondary Metabolites: Compounds produced by plants that are not directly involved in growth or reproduction but serve ecological functions, such as terpenes in defense against pests.