The potato is a starchy tuber of the plant Solanum tuberosum and is a root vegetable and a fruit native to the Americas. The plant is a perennial in the nightshade family Solanaceae.[2]

Wild potato species can be found from the southern United States to southern Chile.[3] The potato was originally believed to have been domesticated by Native Americans independently in multiple locations,[4] but later genetic studies traced a single origin, in the area of present-day southern Peru and extreme northwestern Bolivia. Potatoes were domesticated there approximately 7,000–10,000 years ago, from a species in the Solanum brevicaule complex.[5][6][7] In the Andes region of South America, where the species is indigenous, some close relatives of the potato are cultivated.

Potatoes were introduced to Europe from the Americas by the Spanish in the second half of the 16th century. Today they are a staple food in many parts of the world and an integral part of much of the world's food supply. As of 2014, potatoes were the world's fourth-largest food crop after maize (corn), wheat, and rice.[8] Following millennia of selective breeding, there are now over 5,000 different types of potatoes.[6] Over 99% of potatoes presently cultivated worldwide descend from varieties that originated in the lowlands of south-central Chile.[9] The importance of the potato as a food source and culinary ingredient varies by region and is still changing. It remains an essential crop in Europe, especially Northern and Eastern Europe, where per capita production is still the highest in the world, while the most rapid expansion in production since 2000 has occurred in southern and eastern Asia, with China and India leading the world in overall production as of 2018.

Like the tomato, the potato is a nightshade in the genus Solanum, and the vegetative and fruiting parts of the potato contain the toxin solanine which is dangerous for human consumption. Normal potato tubers that have been grown and stored properly produce glycoalkaloids in amounts small enough to be negligible to human health, but, if green sections of the plant (namely sprouts and skins) are exposed to light, the tuber can accumulate a high enough concentration of glycoalkaloids to affect human health.[10]

"Spud" redirects here. For other uses, see Spud (disambiguation).
The English word potato comes from Spanish patata (the name used in Spain). The Royal Spanish Academy says the Spanish word is a hybrid of the Taíno batata ('sweet potato') and the Quechua papa ('potato').[11][12] The name originally referred to the sweet potato although the two plants are not closely related. The 16th-century English herbalist John Gerard referred to sweet potatoes as common potatoes, and used the terms bastard potatoes and Virginia potatoes for the species now known as potato.[13] In many of the chronicles detailing agriculture and plants, no distinction is made between the two.[14] Potatoes are occasionally referred to as Irish potatoes or white potatoes in the United States, to distinguish them from sweet potatoes.[13]

The name spud for a potato comes from the digging of soil (or a hole) prior to the planting of potatoes. The word has an unknown origin and was originally (c. 1440) used as a term for a short knife or dagger, probably related to the Latin spad-, a word root meaning "sword"; compare Spanish espada, English "spade", and spadroon. It subsequently transferred over to a variety of digging tools. Around 1845, the name transferred to the tuber itself, the first record of this usage being in New Zealand English.[15] The origin of the word spud has erroneously been attributed to an 18th-century activist group dedicated to keeping the potato out of Britain, calling itself the Society for the Prevention of Unwholesome Diet. It was Mario Pei's 1949 The Story of Language that can be blamed for the word's false origin. Pei wrote "the potato, for its part, was in disrepute some centuries ago. Some Englishmen who did not fancy potatoes formed a Society for the Prevention of Unwholesome Diet. The initials of the main words in this title gave rise to spud." Like many other claimed pre-20th century acronymic origins, this is false, and there is no evidence that a Society for the Prevention of Unwholesome Diet ever existed.[16][12]

At least seven languages—Afrikaans, Dutch, French, (West) Frisian, Hebrew, Persian and some variants of German—are known to use a term for "potato" that translates roughly (or literally) into English as "earth apple" or "ground apple".[17][18]


Taxonomic synonyms
List

Description
Potato plants are herbaceous perennials that grow about 60 cm (24 in) high, depending on variety, with the leaves dying back after flowering, fruiting and tuber formation. They bear white, pink, red, blue, or purple flowers with yellow stamens. Potatoes are mostly cross-pollinated by insects such as bumblebees, which carry pollen from other potato plants, though a substantial amount of self-fertilizing occurs as well. Tubers form in response to decreasing day length, although this tendency has been minimized in commercial varieties.[19]

After flowering, potato plants produce small green fruits that resemble green cherry tomatoes, each containing about 300 seeds. Like all parts of the plant except the tubers, the fruit contain the toxic alkaloid solanine and are therefore unsuitable for consumption. All new potato varieties are grown from seeds, also called "true potato seed", "TPS" or "botanical seed" to distinguish it from seed tubers.[20] New varieties grown from seed can be propagated vegetatively by planting tubers, pieces of tubers cut to include at least one or two eyes, or cuttings, a practice used in greenhouses for the production of healthy seed tubers. Plants propagated from tubers are clones of the parent, whereas those propagated from seed produce a range of different varieties.

Potatoes, both S. tuberosum and most of its wild relatives, are self-incompatible: they bear no useful fruit when self-pollinated. This trait is problematic for crop breeding, as all sexually-produced plants must be hybrids. The gene responsible for its trait as well as mutations to disable it are now known. Self-compatibility has successfully been introduced both to diploid potatoes (including a special line of S. tuberosum) by CRISPR-Cas9.[21] Plants having a 'Sli' gene produce pollen which is compatible to its own parent and plants with similar S genes.[22] This gene was recently cloned by Wageningen University and Solynta in 2021, which would allow for faster and more focused breeding.[23][24]

Diploid hybrid potato breeding is a recent area of potato genetics supported by the finding that homozygous fixation of donor alleles is possible.[25]