Thale Cress
Scientific classification
Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Order: Brassicales Family: Brassicaceae Genus: Arabidopsis Species: thaliana
Binomial name
Arabidopsis thaliana

Arabidopsis thaliana, or Thale Cress, a small flowering plant related to cabbage and mustard, is one of the model organisms for studying plant sciences, including genetics and plant development. Similarly as mouse and fruit fly (Drosophila) are used as model organisms to understand human biology, Arabidopsis thaliana is used to study agronomic crops.

The genome of Arabidopsis, consisting of five chromosomes, has been sequenced.

Arabidopsis has been used extensively in the study of the genetic basis of phototropism, chloroplast alignment, and other light influenced processes. Study of this organism has led to discoveries such as positive phototropic responses of root cells to red, far red and infrared light.

While gravitropic response of Arabidopsis root organs is the predominant tropic effect in these organs, specimens treated with mutagens and then selected for the absence of gravitropic action have shown both negative phototropic response to blue or white light, and positive phototropic response to red light. The photosensitive pigments phytochrome A and phytochrome B mediate this red light based phototropic response.

Common names include Thale Cress, Mouse-ear Cress, and Mustard Weed.

See also

• Botany
• Molecular biology

External links

• The Arabidopsis Information Resource (TAIR) (http://www.arabidopsis.org/)
• Nature Gateway on Arabidopsis (http://www.nature.com/genomics/papers/a_thaliana.html)
• The Arabidopsis Book - comprehensive electronic book (http://www.aspb.org/publications/arabidopsis/)
• Arabidopsis thaliana: another "model organism" (http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/Arabidopsis.html) from Kimball's Biology Pages (http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/)

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