Quinoa

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Quinoa (Chenopodium quinoa; ( or , from Quechua kinwa or kinuwa) is a flowering plant in the amaranth family. It is a herbaceous annual plant grown as a grain crop primarily for its edible seeds. Quinoa is not a grass, but rather a pseudocereal botanically related to spinach and amaranth (Amaranthus spp.).

Quinoa is the only food of vegetable origin that provides all the essential amino acids, trace elements and vitamins, equating its protein quality to that of milk. It is gluten-free. Its grains are highly nutritious, surpassing cereals, such as wheat, corn, rice and oats, in biological value and nutritional quality. After harvest, the seeds are processed to remove the bitter-tasting outer seed coat.

Quinoa originated in the Andean region of northwestern South America, and was domesticated 3,000 to 4,000 years ago for human consumption in the Lake Titicaca basin of Peru and Bolivia, though archaeological evidence shows livestock uses 5,200 to 7,000 years ago.

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Botany

Description

Chenopodium quinoa is a dicotyledonous annual plant, usually about 1-2 m (3.3-6.6 ft) high. It has broad, generally powdery, hairy, lobed leaves, normally arranged alternately. The woody central stem is branched or unbranched depending on the variety and may be green, red or purple. The flowering panicles arise from the top of the plant or from leaf axils along the stem. Each panicle has a central axis from which a secondary axis emerges either with flowers (amaranthiform) or bearing a tertiary axis carrying the flowers (glomeruliform). The green hypogynous flowers have a simple perianth and are generally self-fertilizing. The fruits (seeds) are about 2 mm (0.08 in) in diameter and of various colors--from white to red or black, depending on the cultivar.

Natural distribution

Chenopodium quinoa is believed to have been domesticated in the Peruvian Andes from wild or weed populations of the same species. There are non-cultivated quinoa plants (Chenopodium quinoa var. melanospermum) that grow in the area it is cultivated; these may either be related to wild predecessors, or they could be descendants of cultivated plants.

Saponins and oxalic acid

In their natural state, the seeds have a coating which contains bitter-tasting saponins, making them unpalatable. Most of the grain sold commercially has been processed to remove this coating. This bitterness has beneficial effects during cultivation, as it deters birds and therefore the plant requires minimal protection. The genetic control of bitterness involves quantitative inheritance. Although lowering the saponin content through selective breeding to produce sweeter, more palatable varieties is complicated by ?10% cross-pollination, it is a major goal of quinoa breeding programs, which may include genetic engineering.

The toxicity category rating of the saponins in quinoa treats them as mild eye and respiratory irritants and as a low gastrointestinal irritant. In South America, the saponins have many uses, including their use as a detergent for clothing and washing, and as a folk medicine antiseptic for skin injuries.

Additionally, high levels of oxalic acid are in the leaves and stems of all species of the genus Chenopodium, and in the related genera of the family Amaranthaceae. The risks associated with quinoa are minimal, provided it is properly prepared and the leaves are not eaten to excess.

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Nutritional value

Raw, uncooked quinoa is 13% water, 64% carbohydrates, 14% protein, and 6% fat. Nutritional evaluations indicate that a 100 g (3.5 oz) serving of raw quinoa is a rich source (20% or higher of the Daily Value, DV) of protein, dietary fiber, several B vitamins, including 46% DV for folate, and dietary minerals.

After cooking, which is the typical preparation for eating, quinoa is 72% water, 21% carbohydrates, 4% protein, and 2% fat. In a 100 g (3.5 oz) serving, cooked quinoa provides 120 calories and is an excellent source of manganese and phosphorus (30% and 22% DV, respectively), and a moderate source (10-19% DV) of dietary fiber, folate, and the dietary minerals, iron, zinc, and magnesium.

Quinoa is gluten-free and considered easy to digest. Because of the high concentration of protein, ease of use, versatility in preparation, and potential for greatly increased yields in controlled environments, it has been selected as an experimental crop in NASA's Controlled Ecological Life Support System for long-duration human occupied space flights.

Cooking With Grains: Quinoa - Dr. Weil's Healthy Kitchen

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Cultivation

Climate requirements

The plant's growth is highly variable due to the number of different subspecies, varieties and landraces (domesticated plants or animals adapted to the environment in which they originated). However, it is generally undemanding and altitude-hardy; it is grown from coastal regions to over 4,000 m (13,000 ft) in the Andes near the equator, with most of the cultivars being grown between 2,500 m (8,200 ft) and 4,000 m (13,000 ft). Depending on the variety, optimal growing conditions are in cool climates with temperatures that vary between -4 °C (25 °F) during the night to near 35 °C (95 °F) during the day. Some cultivars can withstand lower temperatures without damage. Light frosts normally do not affect the plants at any stage of development, except during flowering. Midsummer frosts during flowering, a frequent occurrence in the Andes, lead to sterilization of the pollen. Rainfall requirements are highly variable between the different cultivars, ranging from 300 to 1,000 mm (12 to 39 in) during the growing season. Growth is optimal with well-distributed rainfall during early growth and no rain during seed maturation and harvesting.

United States

Quinoa has been cultivated in the United States, primarily in the high elevation San Luis Valley of Colorado where it was introduced in 1983. In this high-altitude desert valley, maximum summer temperatures rarely exceed 30 °C (86 °F) and night temperatures are about 7 °C (45 °F). Due to the short growing season, North American cultivation requires short-maturity varieties, typically of Bolivian origin.

Europe

Several countries within Europe, including France, England, The Netherlands, Belgium, Germany and Spain, have successfully grown quinoa on a commercial scale. As of 2015, within the UK, crops have been grown to scale and mechanically harvested in September.

Sowing

Quinoa plants do best in sandy, well-drained soils with a low nutrient content, moderate salinity, and a soil pH of 6 to 8.5. The seedbed must be well prepared and drained to avoid waterlogging.

Soil and pests

Yields are maximised when 170 to 200 kg (370 to 440 lb) N per hectare are available. The addition of phosphorus does not improve yield. In eastern North America, it is susceptible to a leaf miner that may reduce crop success. (It also affects the common weed and close relative Chenopodium album, but C. album is much more resistant.)

Genetics

The genome of quinoa was sequenced in 2017 by researchers at King Abdullah University of Science and Technology in Saudi Arabia. Through genetic engineering, the plant is being modified to have higher crop yield, improved tolerance to heat and biotic stress, and greater sweetness through saponin inhibition.

Harvesting

Traditionally, quinoa grain is harvested by hand, and only rarely by machine, because the extreme variability of the maturity period of most Quinoa cultivars complicates mechanization. Harvest needs to be precisely timed to avoid high seed losses from shattering, and different panicles on the same plant mature at different times. The crop yield in the Andean region (often around 3 t/ha up to 5 t/ha) is comparable to wheat yields. In the United States, varieties have been selected for uniformity of maturity and are mechanically harvested using conventional small grain combines.

Processing

The plants are allowed to stand until the stalks and seeds have dried out and the grain has reached a moisture content below 10%.

Handling involves threshing the seedheads from the chaff and winnowing the seed to remove the husk. Before storage, the seeds need to be dried in order to avoid germination. Dry seeds can be stored raw until being washed or mechanically processed to remove the pericarp to eliminate the bitter layer containing saponins. The seeds must be dried again before being stored and sold in stores.

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History and culture

Early history

Quinoa was first domesticated by Andean peoples around 3,000 to 4,000 years ago. It has been an important staple in the Andean cultures where the plant is indigenous but relatively obscure to the rest of the world. The Incas, who held the crop to be sacred, referred to it as chisoya mama or "mother of all grains", and it was the Inca emperor who would traditionally sow the first seeds of the season using "golden implements".

During the Spanish conquest of South America, the colonists scorned it as "food for Indians", and suppressed its cultivation, due to its status within indigenous religious ceremonies. The conquistadors forbade quinoa cultivation at one point, and the Incas were forced to grow wheat instead.

Rising popularity and crop value

Since the grain has become increasingly popular in countries where it is not typically grown, namely the United States, Canada, Europe, Australia, China and Japan, the crop value has increased. Between 2006 and 2013, quinoa crop prices tripled. In 2011, the average price was US$3,115 per ton with some varieties selling as high as $8,000 per ton. This compares with wheat prices of $9 per bushel (about US$340 per ton), making wheat about 1/10 the value.

The resulting 'quinoa boom' has had a pronounced effect on traditional production regions, while also leading to new commercial quinoa production elsewhere in the world. This has led to a debate about whether the global rise in quinoa consumption has had ethically positive outcomes for traditional regions.

It has been suggested that rising quinoa prices lead traditional consumers to be unable to afford the product. Academic work has found that this is wrong. A 2016 study using Peru's Encuesta Nacional de Hogares, a large-scale, nationally representative household survey, found that during 2004-2013 rising quinoa prices led to net economic benefits for producers, and other commentary has suggested similar conclusions, including for women specifically. It has also been suggested that as quinoa producers rise above subsistence-level income, they switch their own consumption to Western processed foods which are often less healthy than a traditional, Quinoa-based diet, whether because quinoa is held to be worth too much to keep for oneself and one's family, or because processed foods have higher status despite their poorer nutritional value. Again, however, the same academic work suggests that rising quinoa prices bring net welfare benefits to producers; rather, a downturn in prices may be grounds for greater concern. Efforts are being made in some areas to distribute quinoa more widely and ensure that farming and poorer populations have access to it and have an understanding of its nutritional importance. These efforts include incorporating it into free school breakfasts and government provisions distributed to pregnant and nursing women in need.

In terms of wider social consequences, research on traditional producers in Bolivia has emphasised a complex picture. The degree to which individual producers benefit from the global quinoa boom depends on its mode of production, for example through producers' associations and co-operatives like the Asociación Nacional de Productores de Quinua (founded in the 1970s), contracting through vertically-integrated private firms, or wage labour. State regulation and enforcement is also important. It has for example promoted a shift to cash-cropping among some farmers and a shift towards subsistence production among others, while enabling many urban refugees to return to working the land, outcomes with complex and varied social effects.

The popularity of quinoa grain in non-indigenous regions has raised concerns over food security. Academic research has emphasised that the quinoa boom in indigenous regions is encouraging unsustainably intensive farming of the crop, and the expansion of farming into ecologically fragile ecosystems, threatening both the sustainability of producers' agriculture, the biodiversity of quinoa, and local biodiversity more generally.

World demand for quinoa is sometimes presented in the media particularly as being caused by rising veganism, but academic commentary has noted that promoting meat consumption as an ethical alternative to eating quinoa is generally inconsistent with achieving a sustainable world food supply.

Kosher controversy

Quinoa has become popular in the Jewish community as a substitute for the leavened grains that are forbidden during the Passover holiday. Several kosher certification organizations refuse to certify it as being kosher for Passover, citing reasons including its resemblance to prohibited grains or fear of cross-contamination of the product from nearby fields of prohibited grain or during packaging. However, in December 2013 the Orthodox Union, the world's largest kosher certification agency, announced it would begin certifying quinoa as kosher for Passover.

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International Year of Quinoa, 2013

The United Nations General Assembly declared 2013 as the "International Year of Quinoa" in recognition of the ancestral practices of the Andean people, who have preserved it as a food for present and future generations, through knowledge and practices of living in harmony with nature. The objective was to draw the world's attention to the role that quinoa could play in providing food security, nutrition and poverty eradication in support of achieving Millennium Development Goals. Some academic commentary emphasised, however, that quinoa production could have ecological and social drawbacks in its native regions, and that these problems needed to be tackled.

Cilantro Quinoa with Pine Nuts Recipe - Cooking Light

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Gallery

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References

Smoky Quinoa and Bacon Salad Recipe - Todd Porter and Diane Cu ...

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External links

Data related to Chenopodium quinoa at Wikispecies

Source of the article : Wikipedia

Quinoa

Kamis, 07 Juni 2018

Quinoa

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