Peach

The Peach (Amygdabus Persica), the apple of Persia, began to be cultivated in England about 1562, or perhaps before then. Columella tells of this fatal gift conveyed treacherously to Egypt in the first century:--
"Apples, which most barbarous Persia sent, With native poison armed."
The Peach tree is so well known by its general characteristics as not to need any particular description. Its young branches, flowers, and seeds, after maceration in water, yield a volatile oil which is chemically identical with that of the bitter almond. The flowers are laxative, and have been used instead of manna. When distilled, they furnish a white liquor which communicates a flavour resembling the kernels of fruits. An infusion made from one drachm of the dried flowers, or from half an ounce of the fresh flowers, has a purgative effect. The fruit is wholesome, and seldom disagrees if eaten when ripe and sound. Its quantity of sugar is only small, but the skin is indigestible.
The leaves possess the power of expelling worms if applied outside a child's belly as a poultice, but in any medicinal form they must be used with caution, as they contain some of the properties of prussic acid, as found also in the leaves of the laurel. A syrup of Peach flowers was formerly a preparation recognised by apothecaries. The leaves infused in white brandy, sweetened with barley sugar, make a fine cordial similar to noyeau. Soyer says the old Romans gave as much for their peaches as eighteen or nineteen shillings each.
Peach pie, owing to the abundance of the fruit, is as common fare in an American farm-house, as apple pie in an English homestead. Our English King John died at Swinestead Abbey from a surfeit of peaches, and new ale.
A tincture made from the flowers will allay the pain of colic caused by gravel; but the kernels of the fruit, which yield an oil identical with that of bitter almonds, have produced poisonous effects with children.
Gerard teaches "that a syrup or strong infusion of Peach flowers doth singularly well purge the belly, and yet without grief or trouble." Two tablespoonfuls of the infusion for a dose.
In Sicily there is a belief that anyone afflicted with goitre, who eats a Peach on the night of St. John, or the Ascension, will be cured, provided only that the Peach tree dies at the same time.
In Italy Peach leaves are applied to a wart, and then buried, so that they and the wart may perish simultaneously.
The peach (Prunus persica) is a deciduous tree native to the region of Northwest China between the Tarim Basin and the north slopes of the Kunlun Mountains, where it was first domesticated and cultivated.[3] It bears edible juicy fruits with various characteristics, most called peaches and others (the glossy-skinned varieties), nectarines. The specific name persica refers to its widespread cultivation in Persia (modern-day Iran), from where it was transplanted to Europe. It belongs to the genus Prunus, which includes the cherry, apricot, almond, and plum, in the rose family. The peach is classified with the almond in the subgenus Amygdalus, distinguished from the other subgenera by the corrugated seed shell. Due to their close relatedness, the kernel of a peach stone tastes remarkably similar to almond, and peach stones are often used to make a cheap version of marzipan, known as persipan.[4]
Peaches and nectarines are the same species, though they are regarded commercially as different fruits. The skin of nectarines lacks the fuzz (fruit-skin trichomes) that peach skin has; a mutation in a single gene (MYB25) is thought to be responsible for the difference between the two.[5][6]
In 2018, China produced 62% of the world total of peaches and nectarines.[7]
Description Peach flowers Prunus persica grows up to 7 m (23 ft) tall and wide, but when pruned properly, trees are usually 3–4 m (10–13 ft) tall and wide.[8] The leaves are lanceolate, 7–16 cm (3–6+1⁄2 in) long, 2–3 cm (3⁄4–1+1⁄4 in) broad, and pinnately veined. The flowers are produced in early spring before the leaves; they are solitary or paired, 2.5–3 cm diameter, pink, with five petals. The fruit has yellow or whitish flesh, a delicate aroma, and a skin that is either velvety (peaches) or smooth (nectarines) in different cultivars. The flesh is very delicate and easily bruised in some cultivars, but is fairly firm in some commercial varieties, especially when green. The single, large seed is red-brown, oval shaped, around 1.3–2 cm long, and surrounded by a wood-like husk. Peaches, along with cherries, plums, and apricots, are stone fruits (drupes). The various heirloom varieties including the 'Indian Peach', or 'Indian Blood Peach', which ripens in the latter part of the summer, and can have color ranging from red and white, to purple.[9]
Cultivated peaches are divided into clingstones and freestones, depending on whether the flesh sticks to the stone or not; both can have either white or yellow flesh. Peaches with white flesh typically are very sweet with little acidity, while yellow-fleshed peaches typically have an acidic tang coupled with sweetness, though this also varies greatly. Both colors often have some red on their skins. Low-acid, white-fleshed peaches are the most popular kinds in China, Japan, and neighbouring Asian countries, while Europeans and North Americans have historically favoured the acidic, yellow-fleshed cultivars.
Etymology The scientific name persica, along with the word "peach" itself and its cognates in many European languages, derives from an early European belief that peaches were native to Persia (modern-day Iran). The Ancient Romans referred to the peach as malum persicum "Persian apple", later becoming French pêche, whence the English "peach".[10] The scientific name, Prunus persica, literally means "Persian plum", as it is closely related to the plum.
Fossil record Fossil endocarps with characteristics indistinguishable from those of modern peaches have been recovered from late Pliocene deposits in Kunming, dating to 2.6 million years ago. In the absence of evidence that the plants were in other ways identical to the modern peach, the name Prunus kunmingensis has been assigned to these fossils.[11]
History
Dried date, peach, apricot, and stones from Lahun, Fayum, Egypt, Late Middle Kingdom, Petrie Museum of Egyptian Archaeology, London Although its botanical name Prunus persica refers to Persia, genetic studies suggest peaches originated in China,[12] where they have been cultivated since the neolithic period. Until recently, cultivation was believed to have started around 2000 BC.[13][14] More recent evidence indicates that domestication occurred as early as 6000 BC in Zhejiang Province of China. The oldest archaeological peach stones are from the Kuahuqiao site. Archaeologists point to the Yangtze River Valley as the place where the early selection for favorable peach varieties probably took place.[15] Peaches were mentioned in Chinese writings and literature beginning from the early first millennium BC.[16]
A domesticated peach appeared very early in Japan, in 4700–4400 BC, during the Jōmon period. It was already similar to modern cultivated forms, where the peach stones are significantly larger and more compressed than earlier stones. This domesticated type of peach was brought into Japan from China. Nevertheless, in China itself, this variety is currently attested only at a later date around 3300 to 2300 BC.[15]
In India, the peach first appeared by about 1700 BC, during the Harappan period.[17]
It is also found elsewhere in Western Asia in ancient times.[18] Peach cultivation reached Greece by 300 BC.[14] Alexander the Great is sometimes said to have introduced them into Greece after conquering Persia,[18] but no historical evidence for this claim has been found.[19] Peaches were, however, well known to the Romans in the first century AD;[14] the oldest known artistic representations of the fruit are in two fragments of wall paintings, dated to the first century AD, in Herculaneum, preserved due to the Vesuvius eruption of 79 AD, and now held in the National Archaeological Museum in Naples.[20] Archaeological finds show that peaches were cultivated widely in Roman northwestern Continental Europe, but production collapsed around the sixth century; some revival of production followed with the Carolingian Renaissance of the 9th century.[21]
An article on peach tree cultivation in Spain is brought down in Ibn al-'Awwam's 12th-century agricultural work, Book on Agriculture.[22] The peach was brought to the Americas by Spanish explorers in the 16th century, and eventually made it to England and France in the 17th century, where it was a prized and expensive treat. Horticulturist George Minifie supposedly brought the first peaches from England to its North American colonies in the early 17th century, planting them at his estate of Buckland in Virginia.[23] Although Thomas Jefferson had peach trees at Monticello, American farmers did not begin commercial production until the 19th century in Maryland, Delaware, Georgia, South Carolina, and finally Virginia.[citation needed]
The Shanghai honey nectar peach was a key component of both the food culture and agrarian economy the area where the modern megacity of Shanghai stands. Peaches where the cornerstone of early Shanghai’s garden culture. As modernization and westernization swept through the city the Shanghai honey nectar peach nearly disappeared completely. Much of modern Shanghai is built over these gardens and peach orchards.[24]
In April 2010, an international consortium, the International Peach Genome Initiative, which include researchers from the United States, Italy, Chile, Spain, and France, announced they had sequenced the peach tree genome (doubled haploid Lovell). Recently, it published the peach genome sequence and related analyses. The sequence is composed of 227 million nucleotides arranged in eight pseudomolecules representing the eight peach chromosomes (2n = 16). In addition, 27,852 protein-coding genes and 28,689 protein-coding transcripts were predicted.
Particular emphasis in this study is reserved for the analysis of the genetic diversity in peach germplasm and how it was shaped by human activities such as domestication and breeding. Major historical bottlenecks were found, one related to the putative original domestication that is supposed to have taken place in China about 4,000–5,000 years ago, the second is related to the western germplasm and is due to the early dissemination of the peach in Europe from China and the more recent breeding activities in the United States and Europe. These bottlenecks highlighted the substantial reduction of genetic diversity associated with domestication and breeding activities.[25]
Cultivation
A peach flower with a bee pollinating it Peaches grow in a fairly limited range in dry, continental or temperate climates, since the trees have a chilling requirement that tropical or subtropical areas generally do not satisfy except at high altitudes (for example in certain areas of Ecuador, Colombia, Ethiopia, India, and Nepal). Most cultivars require 500 hours of chilling around 0 to 10 °C (32 to 50 °F). During the chilling period, key chemical reactions occur, but the plant appears dormant. Once the chilling period is fulfilled, the plant enters a second type of dormancy, the quiescence period. During quiescence, buds break and grow when sufficient warm weather favorable to growth is accumulated.[26]
The trees themselves can usually tolerate temperatures to around −26 to −30 °C (−15 to −22 °F), although the following season's flower buds are usually killed at these temperatures, preventing a crop that summer. Flower bud death begins to occur between −15 and −25 °C (5 and −13 °F), depending on the cultivar and on the timing of the cold, with the buds becoming less cold tolerant in late winter.[27]
Another climate constraint is spring frost. The trees flower fairly early (in March in Western Europe), and the blossom is damaged or killed if temperatures drop below about −4 °C (25 °F). If the flowers are not fully open, though, they can tolerate a few degrees colder.[28]
Climates with significant winter rainfall at temperatures below 16 °C (61 °F) are also unsuitable for peach cultivation, as the rain promotes peach leaf curl, which is the most serious fungal disease for peaches. In practice, fungicides are extensively used for peach cultivation in such climates, with more than 1% of European peaches exceeding legal pesticide limits in 2013.[29]
Finally, summer heat is required to mature the crop, with mean temperatures of the hottest month between 20 and 30 °C (68 and 86 °F).
Typical peach cultivars begin bearing fruit in their third year. Their lifespan in the U.S. varies by region; the University of California at Davis gives a lifespan of about 15 years[30] while the University of Maine gives a lifespan of 7 years there.[31]
Cultivars
White peach of the clingstone variety Hundreds of peach and nectarine cultivars are known. These are classified into two categories—freestones and clingstones. Freestones are those whose flesh separates readily from the pit. Clingstones are those whose flesh clings tightly to the pit. Some cultivars are partially freestone and clingstone, so are called semifree. Freestone types are preferred for eating fresh, while clingstone types are for canning. The fruit flesh may be creamy white to deep yellow, to dark red; the hue and shade of the color depend on the cultivar.[32]
Peach breeding has favored cultivars with more firmness, more red color, and shorter fuzz on the fruit surface. These characteristics ease shipping and supermarket sales by improving eye appeal. This selection process has not necessarily led to increased flavor, though. Peaches have a short shelf life, so commercial growers typically plant a mix of different cultivars to have fruit to ship all season long.[33]
Different countries have different cultivars. In the United Kingdom, for example, these cultivars have gained the Royal Horticultural Society's Award of Garden Merit:
'Duke of York'[34] 'Peregrine'[35] 'Rochester'[36] 'Lord Napier' (nectarine)[37] Nectarines
White nectarines, whole and cut open The variety P. persica var. nucipersica (or var. nectarina), commonly called nectarine, has a smooth skin. It is on occasion referred to as a "shaved peach" or "fuzzless peach", due to its lack of fuzz or short hairs. Though fuzzy peaches and nectarines are regarded commercially as different fruits, with nectarines often erroneously believed to be a crossbreed between peaches and plums, or a "peach with a plum skin", nectarines belong to the same species as peaches. Several genetic studies have concluded nectarines are produced due to a recessive allele, whereas a fuzzy peach skin is dominant.[5] Nectarines have arisen many times from peach trees, often as bud sports.
As with peaches, nectarines can be white or yellow, and clingstone or freestone. On average, nectarines are slightly smaller and sweeter than peaches, but with much overlap.[5] The lack of skin fuzz can make nectarine skins appear more reddish than those of peaches, contributing to the fruit's plum-like appearance. The lack of down on nectarines' skin also means their skin is more easily bruised than peaches.
The history of the nectarine is unclear; the first recorded mention in English is from 1616,[38] but they had probably been grown much earlier within the native range of the peach in central and eastern Asia. Although one source states that nectarines were introduced into the United States by David Fairchild of the Department of Agriculture in 1906,[39] a number of colonial-era newspaper articles make reference to nectarines being grown in the United States prior to the Revolutionary War. The 28 March 1768 edition of the New York Gazette (p. 3), for example, mentions a farm in Jamaica, Long Island, New York, where nectarines were grown.
Peacherines Peacherines are claimed to be a cross between a peach and a nectarine, but as they are the same species, cannot be a true cross (hybrid they are marketed in Australia and New Zealand. The fruit is intermediate in appearance, though, between a peach and a nectarine, large and brightly colored like a red peach. The flesh of the fruit is usually yellow, but white varieties also exist. The Koanga Institute lists varieties that ripen in the Southern Hemisphere in February and March.[40][41]
In 1909, Pacific Monthly mentioned peacherines in a news bulletin for California. Louise Pound, in 1920, claimed the term peacherine is an example of language stunt.[42]
Flat peaches Main article: Flat peach Flat peaches, or pan-tao, have a flattened shape, in contrast to ordinary near-spherical peaches.[43]
Planting
The developmental sequence of a nectarine over a 7+1⁄2-month period, from bud formation in early winter to fruit ripening in midsummer Most peach trees sold by nurseries are cultivars budded or grafted onto a suitable rootstock. Common rootstocks are 'Lovell Peach', 'Nemaguard Peach', Prunus besseyi, and 'Citation'.[44] The rootstock provides hardiness and budding is done to improve predictability of the fruit quality.
Peach trees need full sun, and a layout that allows good natural air flow to assist the thermal environment for the tree. Peaches are planted in early winter. During the growth season, they need a regular and reliable supply of water, with higher amounts just before harvest.[45]
Peaches need nitrogen-rich fertilizers more than other fruit trees. Without regular fertilizer supply, peach tree leaves start turning yellow or exhibit stunted growth. Blood meal, bone meal, and calcium ammonium nitrate are suitable fertilizers.
The flowers on a peach tree are typically thinned out because if the full number of peaches mature on a branch, they are undersized and lack flavor. Fruits are thinned midway in the season by commercial growers. Fresh peaches are easily bruised, so do not store well. They are most flavorful when they ripen on the tree and are eaten the day of harvest.[45]
The peach tree can be grown in an espalier shape. The Baldassari palmette is a design created around 1950 used primarily for training peaches. In walled gardens constructed from stone or brick, which absorb and retain solar heat and then slowly release it, raising the temperature against the wall, peaches can be grown as espaliers against south-facing walls as far north as southeast Great Britain and southern Ireland.