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Arabidopsis research has also produced important discoveries in fundamental plant science, such as the identification of a plant hormone receptor, a clearer understanding of how plants sense and respond to light, and more about the processes that induce plants to form flowers. Arabidopsis research may even have direct relevance to human biology. For example, a circadian relating to photoreceptor protein that regulates circadian rhythms in Arabidopsis was day or day |ength found to share sequence similarity to a retinal photoreceptor, which may perform a similar role in mammals. see also Inheritance Patterns; Model Organisms; Transformation; Transgenic Plants.

Paul J. Muhlrad

Bibliography

Meinke, David W., et al. "Arabidopsis thaliana: A Model Plant for Genome Analysis." Science 283, no. 5389 (1998): 662-681.

Internet Resources

The Arabidopsis Information Resource. <http://www.arabidopsis.org/>.

Nature, Vol. 408, December 2000. (Issue devoted to Arabidopsis thaliana; <http://www .nature.com/genomics/papers/a_thaliana.html>).

? Archaea

Members of the Archaea comprise one of the three principal domains of liv-

phylogenetic related to ing organisms in the universal phylogenetic tree of life. The other two prin-

the evo|utionary deve|- cipal domains are the Bacteria and the Eukarya. The phylogenetic tree is a opment of a species , . , . r ,, . , . , , , . c theoretical representation of all living things, constructed on the basis of comparative ribosomal RNA sequencing and reflecting evolutionary relationships rather than structural similarities.

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