Trichomes

Definition

Trichomes are hair-like structures on the epidermis of plant stems, leaves, and flowers. They can serve various functions such as protection against herbivores, reduction of water loss, and secretion of toxic or deterrent chemicals.

5 Must Know Facts For Your Next Test

1. Trichomes can be glandular or non-glandular, with glandular trichomes often secreting substances like essential oils.
2. They play a significant role in reducing water loss by trapping moisture near the plant surface.
3. Trichomes can act as physical and chemical barriers against herbivores and pathogens.
4. In some plants, trichomes are involved in temperature regulation by reflecting sunlight.
5. The density and type of trichomes can vary widely between species and even within different parts of the same plant.

Review Questions

Related terms

Epidermis: The outer layer of cells covering an organism, particularly a plant's surface.

Stomata: Pores on the leaf surface that allow gas exchange between the plant and its environment.

Cuticle:

A waxy layer covering the epidermis that helps prevent water loss.