Center of origin
A center of origin (or center of diversity) is a geographical area where a group of organisms, either domesticated or wild, first developed its distinctive properties. They are also considered centers of diversity. Centers of origin were first identified in 1924 by Nikolai Vavilov.
Locating the origin of crop plants is basic to plant breeding. This allows one to locate wild relatives, related species, and new genes (especially dominant genes, which may provide resistance to diseases). Knowledge of the origins of crop plants is important in order to avoid genetic erosion, the loss of germplasm due to the loss of ecotypes and landraces, loss of habitat (such as rainforests), and increased urbanization. Germplasm preservation is accomplished through gene banks (largely seed collections but now frozen stem sections) and preservation of natural habitats (especially in centers of origin).
A Vavilov Center (of Diversity) is a region of the world first indicated by Nikolai Vavilov to be an original center for the domestication of plants. For crop plants, Nikolai Vavilov identified differing numbers of centers: three in 1924, five in 1926, six in 1929, seven in 1931, eight in 1935 and reduced to seven again in 1940.
Vavilov argued that plants were not domesticated somewhere in the world at random, but that there were regions where domestication started. The center of origin is also considered the center of diversity.
Vavilov centers are regions where a high diversity of crop wild relatives can be found, representing the natural relatives of domesticated crop plants. Later in 1935 Vavilov divided the centers into 12, giving the following list:
- Chinese center
- Indian center
- Indo-Malayan center
- Central Asiatic center
- Persian center
- Mediterranean center
- Abyssinian center
- South American center
- Central American center
- Chilean center
- Brazilian-Paraguayan center
- North American center
|1) South Mexican and Central American Center||Includes southern sections of Mexico, Guatemala, Honduras and Costa Rica.
|2) South American Center||62 plants listed; three subcenters
2) Peruvian, Ecuadorean, Bolivian Center:
2A) Chiloe Center (Island near the coast of southern Chile)
2B) Brazilian-Paraguayan Center
|3) Mediterranean Center||Includes the borders of the Mediterranean Sea. 84 listed plants
|4) Middle East||Includes interior of Asia Minor, all of Transcaucasia, Iran, and the highlands of Turkmenistan. 83 species
|5) Ethiopia||Includes Abyssinia, Eritrea, and part of Somalia. 38 species listed; rich in wheat and barley.|
|6) Central Asiatic Center||Includes Northwest India (Punjab, Northwest Frontier Provinces and Kashmir), Afghanistan, Tadjikistan, Uzbekistan, and western Tian-Shan. 43 plants|
|7) Indian Center||Two subcenters
7A) Siam-Malaya-Java: statt Indo-Malayan Center: Includes Indo-China and the Malay Archipelago, 55 plants
|8) Chinese Center||A total of 136 endemic plants are listed in the largest independent center
In 2016, researchers linked the origins and primary regions of diversity ("areas typically including the locations of the initial domestication of crops, encompassing the primary geographical zones of crop variation generated since that time, and containing relatively high species richness in crop wild relatives") of food and agricultural crops with their current importance around the world in modern national food supplies and agricultural production. The results indicated that foreign crops were 68.7% of national food supplies as a global mean, and their usage has greatly increased in the last fifty years.
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- Khoury, C.K.; Achicanoy, H.A.; Bjorkman, A.D.; Navarro-Racines, C.; Guarino, L.; Flores-Palacios, X.; Engels, J.M.M.; Wiersema, J.H.; Dempewolf, H.; Sotelo, S.; Ramírez-Villegas, J.; Castañeda-Álvarez, N.P.; Fowler, C.; Jarvis, A.; Rieseberg, L.H.; Struik, P.C. (2016). "Origins of food crops connect countries worldwide". Proc. R. Soc. B. 283 (1832): 20160792. doi:10.1098/rspb.2016.0792. PMC 4920324.