page_title: Trichome
section_title: Plant trichomes
hierarchical_section_title: Trichome / Plant trichomes
caption_attribution_description: Беларуская (тарашкевіца)‎: Электронны мікраздымак трыхомы: лісьцевы волас Arabidopsis thaliana, унікальнае аднавузавае структуры. Deutsch: Rasterelektronenaufnahme eines Trichoms der Acker-Schmalwand (Arabidopsis thaliana) English: Scanning electron micrograph of trichome: a leaf hair of thale cress (Arabidopsis thaliana), an unique structure that is made of a single cell. Image is made in Tallinn University of Technology. Eesti: Trihhoomid ehk lehekarvad on unikaalsed ühest rakust koosnevad struktuurid müürlooga lehe ja varre pinnal. Trihhoomi rakk on sadu kordi suurem (1–2 mm), kui ümbritsevad epidermise rakud, trihhoomi raku tuumas on 64-128 korda rohkem DNA-d kui diploidsetes rakkudes. Français&#160;: Vue au microscope électronique à balayage d'un trichome d'arabette des dames (Arabidopsis thaliana), une structure unique faite d'une seule cellule.
context_page_description: Trichomes, from the Greek τρίχωμα meaning "hair", are fine outgrowths or appendages on plants, algae, lichens, and certain protists. They are of diverse structure and function. Examples are hairs, glandular hairs, scales, and papillae. A covering of any kind of hair on a plant is an indumentum, and the surface bearing them is said to be pubescent.
context_section_description: Plant trichomes have many different features that vary between both species of plants and organs of an individual plant. These features affect the subcategories that trichomes are placed into. Some defining features include:
  Unicellular or multicellular
  Straight (upright with little to no branching), Spiral (corkscrew-shaped) or Hooked (curved apex)
  Presence of cytoplasm
  Glandular (secretory) vs. Eglandular
  Tortuous, Simple (unbranched and unicellular), Peltate (scale-like), Stellate (star-shaped)
  Adaxial vs. abaxial, referring to whether trichomes are present, respectively, on the upper surface (adaxial) or lower surface (abaxial) of a leaf or other lateral organ.
  In a model organism, C. salvifolius, there are more adaxial trichomes present on this plant because this surface suffers from more UV, solar irradiance light stress than the abaxial surface.
  Trichomes can protect the plant from a large range of detriments, such as UV light, insects, transpiration, and freeze intolerance.
caption: Scanning electron micrograph of a trichome on a leaf Arabidopsis thaliana. The structure is a single cell.
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