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In the world of food, this is a system that might be used to develop trees with one set of roots, but with branches from another species. The development time is thus considerably reduced.
Strangely, most Florida orange trees have lemon-tree roots, while almost all Californian lemon trees have orange-tree roots. Much of this grafting was done to make varieties less susceptible to disease. As an item of curiosity, trees are now available from nurseries that can have grapefruit, kumquats, lemons, limes, oranges and tangerines on their branches at the same time. Much of the development work in this sphere was done with great patience by Luther Burbank in the latter half of the 19th century. See also "Cross pollination"