- Strain (biology)
In biology, strain is a low-level
taxonomic rankused in three related ways.
A strain is a genetic variant or subtype of a microorganism (e.g.
virusor bacteriumor fungus). For example, a "flu strain" is a certain biological form of the influenzaor "flu" virus. Compare clade.
The term has no official ranking status in botany; The term refers to the collective descendants of a common ancestor and is sometimes used to designate a group that has descended from a modified plant by conventional breeding or more often by biotechnological means. Strains might produce one or many commercially desirable descendants, and if introduced into cultivation, they each are given
cultivarnames. Strains may be produced by hybridization or by engineered means. As an example, types of rice strains are made by inserting new genetic material into a rice plant, [ [http://www.latimes.com/news/science/la-me-wu18feb18,0,4864548.story Geneticist shaped hybrid rice strains - Los Angeles Times ] ] all the descendants of the genetically modified rice plant are a strain with a unique genetic code that is passed on to later generations; it can be given a strain designation (normally a number or a formal name) the plants in the strain can then be breed to other rice strains or cultivars and if desirable plants are produced, these are further breed to stabilize the desirable traits and then given a cultivar name and released into production to be used by many farmers.
mouseor a ratstrain is a group of animals that is geneticallyuniform. Strains are used in laboratory experiments. Mouse strains can be inbred, mutatedor genetically engineered, while rat strains are usually inbred.
* [http://www.informatics.jax.org/imsr/index.jsp International Mouse Strain Resource (IMSR)]
* [http://www.informatics.jax.org/external/festing/rat/STRAINS.shtml Rat strain index]
Wikimedia Foundation. 2010.