AskDefine | Define avocados

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Noun

avocados p
  1. Plural of avocado

Extensive Definition

The avocado (Persea americana, also known as the avocado, butter or alligator pear) is a tree native to Mexico, Central and South America, classified in the flowering plant family Lauraceae. The name "avocado" also refers to the fruit (technically a berry) of the tree that contains an egg-shaped pit. Avocado trees were cultivated in pre-Incan settlements with archeological evidence dating to 750 B.C.
Avocados are a commercially valuable crop whose trees and fruit are cultivated in tropical climates throughout the world, producing a green-skinned, pear-shaped fruit that ripens after harvesting. Trees are partially self-pollinating and often are propogated through grafting to maintain a predictable quality and quantity of the fruit.
Avocado fruits have a smooth, creamy, greenish-yellow flesh with an unusually high amount of fat that is primarily monounsaturated. They also contain a high concentration of dietary fiber, vitamins and potassium. The pit, seed, leaves, bark and in some cases fruit can be toxic to some animals, particularly birds, though much less so in humans; the toxicity of the fruit may be an adaptation that assisted seed dispersal by Pleistocene megafauna.

History

P. americana has a long history of being cultivated in Central and South America; a water jar shaped like an avocado, dating to A.D. 900, was discovered in the pre-Incan city of Chan Chan though there is evidence of cultivation in Mexico for as long as 10,000 years. The earliest known written account of the avocado in Europe is that of Martín Fernández de Enciso (c. 1470–c. 1528) in 1518 or 1519 in his book, Suma de Geografía que Trata de Todas las Partidas y Provincias del Mundo. The first written record in English of the use of the word 'avocado' was by Hans Sloane in a 1696 index of Jamaican plants. The plant was introduced to Indonesia by 1750, Brazil in 1809, the Levant in 1908, and South Africa and Australia in the late 19th century. Historically avocados had a long-standing stigma as a sexual stimulant and were not purchased or consumed by any person wishing to preserve a chaste image. Avocados were known by the Aztecs as "the fertility fruit". It is considered by many to be a drupe, but is botanically classified as a berry.
The subtropical species needs a climate without frost and with little wind. High winds reduce the humidity, dehydrate the flowers, and affect pollination. In particular, the West Indian race requires humidity and a tropical climate which is important in flowering. When even a mild frost occurs, some fruit may drop from the tree, reducing the yield, although the Hass cultivar can tolerate temperatures down to −1°C. The trees also need well aerated soils, ideally more than 1 m deep. Yield is reduced when the irrigation water is highly saline. These soil and climate conditions are provided only in a few areas of the world, particularly in southern Spain, the Levant, South Africa, Peru, parts of central and northern Chile, Vietnam, Indonesia, Sri Lanka, Australia, New Zealand, the United States, the Philippines, Malaysia, Mexico and Central America, the center of origin and diversity of this species. Each region has different types of cultivars. Mexico is the largest producer of the Hass variety, with over 1 million tonnes produced annually.

Harvest and post-harvest

An average avocado tree produces about 120 avocados annually. Commercial orchards produce an average of 7 tonnes per hectare each year, with some orchards achieving 20 tonnes per hectare. Biennial bearing can be a problem, with heavy crops in one year being followed by poor yields the next. The avocado tree does not tolerate freezing temperatures, and can be grown only in subtropical or tropical climates.
The avocado is a climacteric fruit, which means that it matures on the tree but ripens off the tree. Avocados used in commerce are picked hard and green and kept in coolers at 38 to 42°F (3.3 to 5.6°C) until they reach their final destination. Avocado must be mature to ripen properly. Avocados that fall off the tree ripen on the ground, and depending on the amount of oil they contain, their taste and texture may vary greatly. Generally, the fruit is picked once it reaches maturity; Mexican growers pick Hass-variety avocados when they have more than 23% dry matter and other producing countries have similar standards. Once picked, avocados ripen in a few days at room temperature (faster if stored with other fruits such as bananas, because of the influence of ethylene gas). Premium supermarkets sell pre-ripened avocados treated with synthetic ethylene to hasten the ripening process. In some cases, avocados can be left on the tree for several months, which is an advantage to commercial growers who seek the greatest return for their crop; if the fruit remains unpicked for too long, however, it will fall to the ground.

Breeding

The species is only partially able to self-pollinate, because of dichogamy in its flowering. This limitation, added to the long juvenile period, makes the species difficult to breed. Most cultivars are propagated via grafting, having originated from random seedling plants or minor mutations derived from cultivars. Modern breeding programs tend to use isolation plots where the chances of cross-pollination are reduced. That is the case for programs at the University of California, Riverside, as well as the Volcani Centre and the Instituto de Investigaciones Agropecuarias in Chile.
The avocado is unusual in that the timing of the male and female flower phases differs among cultivars. There are two flowering types, "A" and "B". "A" cultivar flowers open as female on the morning of the first day and close in late morning or early afternoon. Then they open as male in the afternoon of the second day. "B" varieties open as female on the afternoon of the first day, close in late afternoon and reopen as male the following morning.
"A" cultivars: Hass, Gwen, Lamb Hass, Pinkerton, Reed.
"B" cultivars: Fuerte, Sharwil, Zutano, Bacon, Ettinger, Sir Prize, Walter Hole.
Certain cultivars, such as the Hass, have a tendency to bear well only in alternate years. After a season with a low yield, due to factors such as cold (which the avocado does not tolerate well), the trees tend to produce abundantly the next season. This heavy crop depletes stored carbohydrates, resulting in a reduced yield the following season, and thus the alternate bearing pattern becomes established.

Propagation and rootstocks

While an avocado propagated by seed can bear fruit, it takes roughly 4–6 years to do so, and the offspring is unlikely to resemble the parent cultivar in fruit quality. Thus, commercial orchards are planted using grafted trees and rootstocks. Rootstocks are propagated by seed (seedling rootstocks) and also layering (clonal rootstocks). After about a year of growing the young plants in a greenhouse, they are ready to be grafted. Terminal and lateral grafting is normally used. The scion cultivar will then grow for another 6–12 months before the tree is ready to be sold. Clonal rootstocks have been selected for specific soil and disease conditions, such as poor soil aeration or resistance to the soil-borne disease caused by phytophthora (root rot).

Diseases

Avocado trees are vulnerable to bacterial, viral, fungal and nutritional diseases (excesses and deficiencies of key minerals). Disease can affect all parts of the plant, causing spotting, rotting, cankers, pitting and discoloration.

Cultivation in California

The avocado was introduced to the U.S. state of California in the 19th century, and has become an extremely successful cash crop. Ninety-five percent of United States avocado production is located in southern California, with 60% in San Diego County. Approximately 59,000 acres (approximately 24,000 hectares) of avocados are grown in California. Fallbrook, California, claims the title of "Avocado Capital of the World", and both Fallbrook and Carpinteria, California host annual avocado festivals.

Hass cultivar

While dozens of cultivars are grown in California, the Hass avocado (commonly misspelled "Haas") is the most common. It produces fruit year-round and accounts for the majority of cultivated avocados in in California.
Avocados are more expensive in the USA than in other countries, because those consumed in the USA are grown almost exclusively in California and Florida. California produces about 90% of the nation's avocado crop. They have the highest fiber content of any fruit - including 75% insoluble and 25% soluble fiber.
A fatty triol (fatty alcohol) with one double bond, avocadene (16-heptadecene-1,2,4-triol), is found in avocado.

As a houseplant

Avocado can be grown as a houseplant from seed. It can germinate in normal soil in a large pot or by suspending a washed pit (generally using toothpicks embedded in the sides) pointed-side up and filling the glass until the bottom quarter of the pit is covered. The pit will crack as it absorbs water and germinates, and should sprout in 4–6 weeks. When the roots and stem emerge from the seed, it can be planted in soil. The young tree is amenable to pruning and training but will not normally bear fruit indoors without sufficient sunlight and a second plant to cross-pollinate.

Toxicity to animals

There is documented evidence that animals such as cats, dogs, cattle, goats, rabbits, birds, fish and particularly, horses can be severely harmed or even killed when they consume the avocado leaves, bark, skin, or pit. The avocado fruit is poisonous to birds in some cases, so on a practical level feeding the fruit to birds should be avoided. Avocado leaves contain a toxic fatty acid derivative known as persin, which in sufficient quantity can cause equine colic and, with lack of veterinary treatment, death. The symptoms include gastrointestinal irritation, vomiting, diarrhea, respiratory distress, congestion, fluid accumulation around the tissues of the heart and even death. Birds also seem to be particularly sensitive to this toxic compound. Negative effects in humans seem to be primarily in allergic individuals.

Co-evolution

The avocado may be an example of an 'evolutionary anachronism', a fruit adapted for ecological relationship with now-extinct large mammals (such as the giant ground sloth or the Gomphothere). Most large fleshy fruits serve the function of seed dispersal, accomplished by their consumption by large animals. Author Connie Barlow hypothesizes that the fruit, with its mildly toxic pit, may have co-evolved with Pleistocene megafauna to be swallowed whole and excreted in their dung, ready to sprout. No extant native animal is large enough to effectively disperse avocado seeds in this fashion. When the avocado's hypothesized ecological partners disappeared the avocado likely would have gone extinct, or evolved a different fruit morphology, if human cultivation had not maintained this "ghost of evolution."

References

External links

avocados in Min Nan: Avocado
avocados in Bulgarian: Авокадо
avocados in Catalan: Alvocat
avocados in Czech: Hruškovec přelahodný
avocados in Danish: Avocado
avocados in German: Avocado
avocados in Modern Greek (1453-): Αβοκάντο
avocados in Spanish: Persea americana
avocados in Esperanto: Avokado
avocados in French: Avocatier
avocados in Indonesian: Apokat
avocados in Icelandic: Lárpera
avocados in Italian: Persea americana
avocados in Hebrew: אבוקדו
avocados in Javanese: Apokat
avocados in Haitian: Pye zaboka
avocados in Latin: Persea americana
avocados in Lithuanian: Amerikinė persėja
avocados in Lingala: Sabúká
avocados in Hungarian: Avokádó
nah:Āhuacacuahuitl
avocados in Dutch: Avocado
avocados in Japanese: アボカド
avocados in Norwegian: Avokado
avocados in Norwegian Nynorsk: Avokado
avocados in Uighur: ئاۋكادۇر
avocados in Polish: Smaczliwka
avocados in Portuguese: Abacateiro
avocados in Quechua: Palta
avocados in Russian: Авокадо
avocados in Simple English: Avocado
avocados in Slovenian: Avokadovec
avocados in Serbian: Авокадо
avocados in Finnish: Avokado
avocados in Swedish: Avokado
avocados in Tagalog: Abukado
avocados in Vietnamese: Bơ (thực vật)
avocados in Tonga (Tonga Islands): ʻĀvoka
avocados in Turkish: Avokado
avocados in Ukrainian: Авокадо
avocados in Chinese: 鳄梨
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