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The tomato (/tmeto/ or /tmto/) is the edible berry of the plant Solanum lycopersicum,[1][2] commonly known as the tomato plant. The species originated in western South America, Mexico, and Central America.[2][3] The Nahuatl word tomatl gave rise to the Spanish word tomate, from which the English word tomato derived.[3][4] Its domestication and use as a cultivated food may have originated with the indigenous peoples of Mexico.[2][5] The Aztecs used tomatoes in their cooking at the time of the Spanish conquest of the Aztec Empire, and after the Spanish encountered the tomato for the first time after their contact with the Aztecs, they brought the plant to Europe, in a widespread transfer of plants known as the Columbian exchange. From there, the tomato was introduced to other parts of the European-colonized world during the 16th century.[2]

The wild ancestor of the tomato, Solanum pimpinellifolium, is native to western South America.[7] These wild versions were the size of peas.[7] The first evidence of domestication points to the Aztecs and other peoples in Mesoamerica, who used the fruit fresh and in their cooking. The Spanish first introduced tomatoes to Europe, where they became used in Spanish food. In France, Italy and northern Europe, the tomato was initially grown as an ornamental plant. It was regarded with suspicion as a food because botanists recognized it as a nightshade, a relative of the poisonous belladonna.[3] This was exacerbated by the interaction of the tomato's acidic juice with pewter plates.[8] The leaves and fruit contain tomatine, which in large quantities would be toxic. However, the ripe fruit contains a much lower amount of tomatine than the immature fruit.[9]

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The Aztecs raised several varieties of tomato, with red tomatoes called xitomatl and green tomatoes (physalis) called tomatl (tomatillo).[12] Bernardino de Sahagn reported seeing a great variety of tomatoes in the Aztec market at Tenochtitln (Mexico City): "large tomatoes, small tomatoes, leaf tomatoes, sweet tomatoes, large serpent tomatoes, nipple-shaped tomatoes", and tomatoes of all colors from the brightest red to the deepest yellow.[13] Bernardino de Sahagn mentioned Aztecs cooking various sauces, some with and without tomatoes of different sizes, serving them in city markets: "foods sauces, hot sauces; fried [food], olla-cooked [food], juices, sauces of juices, shredded [food] with chile, with squash seeds [most likely Cucurbita pepo], with tomatoes, with smoked chile, with hot chile, with yellow chile, with mild red chile sauce, yellow chile sauce, hot chile sauce, with "bird excrement" sauce, sauce of smoked chile, heated [sauces], bean sauce; [he sells] toasted beans, cooked beans, mushroom sauce, sauce of small squash, sauce of large tomatoes, sauce of ordinary tomatoes, sauce of various kinds of sour herbs, avocado sauce."[14]

After the Spanish colonization of the Americas, the Spanish distributed the tomato throughout their colonies in the Caribbean. They also took it to the Philippines, from where it spread to southeast Asia and then the entire Asian continent. The Spanish also brought the tomato to Europe. It grew easily in Mediterranean climates, and cultivation began in the 1540s. It was probably eaten shortly after it was introduced, and was certainly being used as food by the early 17th century in Spain.

The tomato was introduced to China, likely via the Philippines or Macau, in the 1500s. It was given the name fnqi (foreign eggplant), as the Chinese named many foodstuffs introduced from abroad, but referring specifically to early introductions.[15]

Unique varieties were developed over the next several hundred years for uses such as dried tomatoes, sauce tomatoes, pizza tomatoes, and tomatoes for long-term storage. These varieties are usually known for their place of origin as much as by a variety name. For example, Pomodorino del Piennolo del Vesuvio is the "hanging tomato of Vesuvius", or the well known and highly prized San Marzano plum tomato grown in that region.[This paragraph needs citation(s)]

However, by the mid-18th century, tomatoes were widely eaten in Britain, and before the end of that century, the Encyclopdia Britannica stated the tomato was "in daily use" in soups, broths, and as a garnish. They were not part of the average person's diet, and though by 1820 they were described as "to be seen in great abundance in all our vegetable markets" and to be "used by all our best cooks", reference was made to their cultivation in gardens still "for the singularity of their appearance", while their use in cooking was associated with exotic Italian or Jewish cuisine.[19] For example, in Elizabeth Blackwell's A Curious Herbal, it is described under the name "Love Apple (Amoris Pomum)" as being consumed with oil and vinegar in Italy, similar to consumption of cucumbers in the UK.[20]

Early tomato breeders included Henry Tilden in Iowa and a Dr. Hand in Baltimore.[27]The U.S. Department of Agriculture's 1937 yearbook declared that "half of the major varieties were a result of the abilities of the Livingstons to evaluate and perpetuate superior material in the tomato." Livingston's first breed of tomato, the Paragon, was introduced in 1870, the beginning of a great tomato culture enterprise in the county. In 1875, he introduced the Acme, which was said to be involved in the parentage of most of the tomatoes introduced by him and his competitors for the next twenty-five years.[28][29]

When Livingston began his attempts to develop the tomato as a commercial crop, his aim had been to grow tomatoes smooth in contour, uniform in size, and sweet in flavor. He eventually developed over seventeen different varieties of the tomato plant.[28] Today, the crop is grown in every state in the Union.[30]

Because of the long growing season needed for this heat-loving crop, several states in the US Sun Belt became major tomato-producers, particularly Florida and California. In California, tomatoes are grown under irrigation for both the fresh fruit market and for canning and processing. The University of California, Davis (UC Davis) became a major center for research on the tomato. The C.M. Rick Tomato Genetics Resource Center at UC Davis is a gene bank of wild relatives, monogenic mutants and miscellaneous genetic stocks of tomato.[31] The center is named for the late Dr. Charles M. Rick, a pioneer in tomato genetics research.[32] Research on processing tomatoes is also conducted by the California Tomato Research Institute in Escalon, California.[33]

In California, growers have used a method of cultivation called dry-farming, especially with Early Girl tomatoes. This technique encourages the plant to send roots deep to find existing moisture in soil that retains moisture, such as clayey soil.

The poor taste and lack of sugar in modern garden and commercial tomato varieties resulted from breeding tomatoes to ripen uniformly red. This change occurred after discovery of a mutant "u" phenotype in the mid-20th century, so named because the fruits ripened uniformly. This was widely cross-bred to produce red fruit without the typical green ring around the stem on uncross-bred varieties. Prior to general introduction of this trait, most tomatoes produced more sugar during ripening, and were sweeter and more flavorful.[34][35]

Furthermore, breeders of modern tomato cultivars typically strive to produce tomato plants exhibiting improved yield, shelf life, size, and tolerance/resistance to various environmental pressures, including disease.[37][38] However, these breeding efforts have yielded unintended negative consequences on various tomato fruit attributes. For instance, linkage drag is a phenomenon that has been responsible for alterations in the metabolism of the tomato fruit. Linkage drag describes the introduction of an undesired trait or allele into a plant during backcrossing. This trait/allele is physically linked (or is very close) to the desired allele along the chromosome. In introducing the beneficial allele, there exists a high likelihood that the poor allele is also incorporated into the plant. Thus, breeding efforts attempting to enhance certain traits (for example: larger fruit size) have unintentionally altered production of chemicals associated with, for instance, nutritional value and flavor.[37]

Breeders have turned to using wild tomato species as a source of alleles for the introduction of beneficial traits into modern tomato varieties. For example, wild tomato relatives may possess higher amounts of fruit solids (which are associated with greater sugar content) or resistance to diseases caused by microbes, such as resistance towards the early blight pathogen Alternaria solani. However, this tactic has limitations, for the incorporation of certain traits, such as pathogen resistance, can negatively impact other favorable phenotypes, such as fruit production.[38][39]

The usual pronunciations of tomato are /tmeto/ t-MAY-toh (usual in North American English) and /tmto/ t-MAH-toh (usual in British English).[41] The word's dual pronunciations were immortalized in Ira and George Gershwin's 1937 song "Let's Call the Whole Thing Off" ("You like /pteto/ and I like /ptto/ / You like /tmeto/ and I like /tmto/") and have become a symbol for nitpicking pronunciation disputes.[citation needed] In this capacity, it has even become an American and British slang term: saying "/tmeto tmto/" when presented with two choices can mean "What's the difference?" or "It's all the same to me".[citation needed]

Most tomato plants have compound leaves, and are called regular leaf (RL) plants, but some cultivars have simple leaves known as potato leaf (PL) style because of their resemblance to that particular relative. Of RL plants, there are variations, such as rugose leaves, which are deeply grooved, and variegated, angora leaves, which have additional colors where a genetic mutation causes chlorophyll to be excluded from some portions of the leaves.[43][unreliable source?] 006ab0faaa