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In botany, a sport or bud sport, traditionally called lusus, is a part of a plant (usually a woody plant, but sometimes a herb) that shows morphological differences from the rest of the plant. Sports may differ by foliage shape or color, flowers, or branch structure.
Sports with desirable characteristics are often propagated vegetatively to form new cultivars that retain the characteristics of the new morphology. Such selections are often prone to "reversion", meaning that part or all of the plant reverts to its original form. An example of a bud sport is the nectarine, which developed from a bud sport from a peach. Other common fruits resulting from a sport mutation are the red Anjou pear and the white currant.
- de Candolle, A. (1868), Laws of Botanical Nomenclature adopted by the International Botanical Congress held at Paris in August 1867; together with an Historical Introduction and Commentary by Alphonse de Candolle, Translated from the French, London: L. Reeve and Co. Article 14 (p. 20-21 and commentary page 42)
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