Sweet corn

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Sweet corn
VegCorn.jpg
Husked sweet corn
Species Zea mays convar. saccharata var. rugosa
OriginUnited States
Loose kernels of sweet corn Sweet Corns.jpg
Loose kernels of sweet corn

Sweet corn (Zea mays convar. saccharata var. rugosa), [1] also called sweetcorn, sugar corn and pole corn, is a variety of corn grown for human consumption with a high sugar content. Sweet corn is the result of a naturally occurring recessive mutation in the genes which control conversion of sugar to starch inside the endosperm of the corn kernel. Sweet corn is picked when still immature (the milk stage) and prepared and eaten as a vegetable, rather than field corn, which is harvested when the kernels are dry and mature (dent stage). [2] Since the process of maturation involves converting sugar to starch, sweet corn stores poorly and must be eaten fresh, canned, or frozen, before the kernels become tough and starchy.

Contents

It is one of the six major types of corn, the others being dent corn, flint corn, pod corn, popcorn, and flour corn. [3]

According to the USDA, 100 grams of raw yellow sweet corn contains 3.43 g glucose, 1.94 g fructose, and 0.89 g sucrose. [4]

Sweet corn, yellow, raw
(seeds only)
Nutritional value per 100 g (3.5 oz)
Energy 360 kJ (86 kcal)
19.02 g
Sugars 3.22 g
Dietary fiber 2.7 g
Fat
1.18 g
3.2 g
Tryptophan 0.023 g
Threonine 0.129 g
Isoleucine 0.129 g
Leucine 0.348 g
Lysine 0.137 g
Methionine 0.067 g
Cystine 0.026 g
Phenylalanine 0.150 g
Tyrosine 0.123 g
Valine 0.185 g
Arginine 0.131 g
Histidine 0.089 g
Alanine 0.295 g
Aspartic acid 0.244 g
Glutamic acid 0.636 g
Glycine 0.127 g
Proline 0.292 g
Serine 0.153 g
Vitamins Quantity
%DV
Vitamin A equiv.
1%
9 μg
Thiamine (B1)
17%
0.200 mg
Niacin (B3)
11%
1.700 mg
Folate (B9)
12%
46 μg
Vitamin C
8%
6.8 mg
Minerals Quantity
%DV
Iron
3%
0.52 mg
Magnesium
9%
37 mg
Potassium
9%
270 mg
Other constituentsQuantity
Water75.96 g

One ear of medium size (6-¾ to 7-½ inches long) maize has 90 grams of seeds
Percentages estimated using US recommendations for adults, [5] except for potassium, which is estimated based on expert recommendation from the National Academies. [6]

History

In 1493, Christopher Columbus returned to Europe with corn seeds, although this revelation did not succeed due to inadequate education of how to produce corn. Sweet corn occurs as a spontaneous mutation in field corn and was grown by several Native American tribes. The European cultivation of sweet corn occurred when the Iroquois tribes grew the first recorded sweet corn (called 'Papoon') for European settlers in 1779. [7] It soon became a popular food in the southern and central regions of the United States.

Young sweet corn YoungSweetCorn.jpg
Young sweet corn
The same rows of corn 41 days later at maturity MatureSweetCorn.jpg
The same rows of corn 41 days later at maturity

Open pollinated cultivars of white sweet corn started to become widely available in the United States in the 19th century. Two of the most enduring cultivars, still available today, are 'Country Gentleman' (a Shoepeg corn with small kernels in irregular rows) and 'Stowell's Evergreen'. [8]

Sweet corn production in the 20th century was influenced by the following key developments:

There are currently hundreds of cultivars, with more constantly being developed.[ citation needed ]

Anatomy

The fruit of the sweet corn plant is the corn kernel, a type of fruit called a caryopsis. The ear is a collection of kernels on the cob. Because corn is a monocot, there is always an even number of rows of kernels.[ further explanation needed ] The ear is covered by tightly wrapped leaves called the husk . Silk is the name for the pistillate flowers, which emerge from the husk. The husk and silk are removed by hand, before boiling but not necessarily before roasting, in a process called husking or shucking. [11] [ citation needed ]

Consumption

In most of Latin America, sweet corn is traditionally eaten with beans. Although both corn and beans contain all 9 essential amino acids, eating a wide variety of foods in one day that includes grains and beans ensures the right balance of essential amino acids. [12] In Brazil, sweet corn cut off from the cobs is generally eaten with peas (where this combination, given the practicality of steamed canned grains in an urban diet, is a frequent addition to diverse meals such as salads, stews, seasoned white rice, risottos, soups, pasta, and whole sausage hot dogs).[ citation needed ]

In Malaysia, there exists a variety unique to the region of Cameron highlands named "pearl corn". The kernels are glossy white, resembling pearls, and can be eaten raw off the cob, although they are often boiled in water and salt. [13]

In the Philippines, boiled sweet corn kernels are served hot with margarine and cheese powder as an inexpensive snack sold by street vendors. [14]

Similarly, sweet corn in Indonesia is traditionally ground or soaked with milk, which makes available the B vitamin niacin in the corn, the absence of which would otherwise lead to pellagra; in Brazil, a combination of ground sweet corn and milk is also the basis of various well-known dishes, such as pamonha and the pudding-like dessert curau, while sweet corn eaten directly off the cob tends to be served with butter.[ citation needed ]

In Europe and Asia sweet corn is often used as a pizza topping or in salads. Corn on the cob is a sweet corn cob that has been boiled, steamed, or grilled whole; the kernels are then cut off and eaten or eaten directly off the cob. Creamed corn is sweet corn served in a milk or cream sauce. Sweet corn can also be eaten as baby corn. Corn soup can be made adding water, butter and flour, with salt and pepper for seasoning.

In the United States, sweet corn is eaten as a steamed vegetable or on the cob, and is usually served with butter and salt. It can be found in Tex-Mex cooking in chili, tacos, and salads. Corn mixed and cooked with lima beans is one form of succotash. Sweet corn is one of the most popular vegetables in the United States, being most popular in the southern and central regions of the country, and can be purchased either fresh, canned, or frozen. Sweet corn ranks among the top ten vegetables in value and per capita consumption.

If left to dry on the plant, kernels may be taken off the cob and cooked in oil where, unlike popcorn, they expand to about double the original kernel size and are often called corn nuts.[ citation needed ]

Health benefits

Overripe sweet corn Sweet corn.jpg
Overripe sweet corn

Cooking sweet corn increases levels of ferulic acid, which has anti-cancer properties. [15]

Cultivars

Open pollinated (non-hybrid) corn has largely been replaced in the commercial market by sweeter, earlier hybrids, which also have the advantage of maintaining their sweet flavor longer. su cultivars are best when cooked within 30 minutes of harvest. Despite their short storage life, many open-pollinated cultivars such as 'Golden Bantam' remain popular for home gardeners and specialty markets or are marketed as heirloom seeds. Although less sweet, they are often described as more tender and flavorful than hybrids.[ citation needed ]

Genetics

Cut white sweet corn. "Shoepeg" is a popular cultivar from the 1900s. Sweet White Corn.jpg
Cut white sweet corn. "Shoepeg" is a popular cultivar from the 1900s.

Early cultivars, including those used by Native Americans, were the result of the mutant su ("sugary") or su1 ( O22637 ) allele of an isoamylase. [7] They contain about 5–10% sugar by weight.[ citation needed ] These varieties are juicy due to the phytoglycogen content, but they lose sugar quickly after harvest, with the content halving in 24 hours. [16]

Supersweet corn are cultivars of sweet corn which produce higher than normal levels of sugar developed by University of Illinois at Urbana–Champaign professor John Laughnan. [10] He was investigating two specific genes in sweet corn, one of which, the sh2 mutation ( P55241 , a Glucose-1-phosphate adenylyltransferase), caused the corn to shrivel when dry. After further investigation, Laughnan discovered that the endosperm of sh2 sweet corn kernels store less starch and from 4 to 10 times more sugar than normal su sweet corn. He published his findings in 1953, disclosing the advantages of growing supersweet sweet corn, but many corn breeders lacked enthusiasm for the new supersweet corn due to the seed shiveling reducing germination rate. [16]

Illinois Foundation Seeds Inc. was the first seed company to release a supersweet corn and it was called 'Illini Xtra Sweet', but widespread use of supersweet hybrids did not occur until the early 1980s. The popularity of supersweet corn rose due to its long shelf life and large sugar content when compared to conventional sweet corn. [16] This has allowed the long-distance shipping of sweet corn and has enabled manufacturers to can sweet corn without adding extra sugar or salt.[ citation needed ] Breeding has resolved the germination rate issue, but it is still generally true that sh2 corn is less juicy than their su counterparts. sh2-i ("shrunken2-intermediate") cultivars under development exploits a different mutation on the same gene to try and create varieties that are both juicy and sweet. [16]

The third gene mutation to be discovered is the se (or se1) for "sugary enhanced" allele, responsible for so-called "Everlasting Heritage" cultivars, such as 'Kandy Korn'. Cultivars with the se alleles have a longer storage life and contain 12–20% sugar.[ citation needed ] The gene for Se1 has been located. [17]

Cooking turns yellow sweet corn golden Sweet Corn.JPG
Cooking turns yellow sweet corn golden

All of the alleles responsible for sweet corn are recessive, so it must be isolated from other corn, such as field corn and popcorn, that release pollen at the same time; the endosperm develops from genes from both parents, and heterozygous kernels will be tough and starchy. The se and su alleles do not need to be isolated from each other. However supersweet cultivars containing the sh2 allele must be grown in isolation from other cultivars to avoid cross-pollination and resulting starchiness, either in space (various sources quote minimum quarantine distances from 100 to 400 feet or 30 to 120 m) or in time (i.e., the supersweet corn does not pollinate at the same time as other corn in nearby fields).[ citation needed ]

Modern breeding methods have also introduced cultivars incorporating multiple gene types:

Often seed producers of the sy and augmented sh2 types will use brand names or trademarks to distinguish these cultivars instead of mentioning the genetics behind them. Generally these brands or trademarks will offer a choice of white, bi-color and yellow cultivars which otherwise have very similar characteristics.[ citation needed ]

Genetically modified corn

Genetically modified sweet corn is available to commercial growers to resist certain insects or herbicides, or both. Such transgenic varieties are not available to home or small acreage growers due to protocols that must be followed in their production. [18]

See also

Related Research Articles

<span class="mw-page-title-main">Cooking banana</span> Banana cultivars commonly used in cooking

Cooking bananas are a group of starchy banana cultivars in the genus Musa whose fruits are generally used in cooking. They are not eaten raw and generally starchy. Many cooking bananas are referred to as plantains or 'green bananas'. In botanical usage, the term "plantain" is used only for true plantains, while other starchy cultivars used for cooking are called "cooking bananas". True plantains are cooking cultivars belonging to the AAB group, while cooking bananas are any cooking cultivar belonging to the AAB, AAA, ABB, or BBB groups. The currently accepted scientific name for all such cultivars in these groups is Musa × paradisiaca. Fe'i bananas from the Pacific Islands are often eaten roasted or boiled, and are thus informally referred to as "mountain plantains", but they do not belong to any of the species from which all modern banana cultivars are descended.

<span class="mw-page-title-main">Popcorn</span> Type of corn kernel which expands and puffs up on heating

Popcorn is a variety of corn kernel which expands and puffs up when heated; the same names also refer to the foodstuff produced by the expansion.

Field corn, also known as cow corn, is a North American term for maize grown for livestock fodder, ethanol, cereal, and processed food products. The principal field corn varieties are dent corn, flint corn, flour corn which includes blue corn, and waxy corn.

<span class="mw-page-title-main">Semolina</span> Coarse, purified milled durum wheat

Semolina is the name given to coarsely milled durum wheat mainly used in making couscous, pasta, and sweet puddings. The term semolina is also used to designate coarse millings of other varieties of wheat, and sometimes other grains as well.

<span class="mw-page-title-main">Corn on the cob</span> Whole sweet corn, consumed as food

Corn on the cob is a culinary term for a cooked ear of sweet corn (maize) eaten directly off the cob. The ear is picked while the endosperm is in the "milk stage" so that the kernels are still tender. Ears of corn are steamed, boiled, or grilled usually without their green husks, or roasted with them. The husk leaves are removed before serving.

<span class="mw-page-title-main">Creamed corn</span> American corn dish with thick, soupy consistency

Creamed corn is a type of creamed vegetable dish made by combining pieces of whole sweetcorn with a soupy liquid of milky residue from immature pulped corn kernels scraped from the cob. Originating in Native American cuisine, it is now most commonly eaten in the Midwestern and Southern United States, as well as being used in the French Canadian dish pâté chinois. It is a soupy version of sweetcorn, and unlike other preparations of sweetcorn, creamed corn is partially puréed, releasing the liquid contents of the kernels.

Aleurone is a protein found in protein granules of maturing seeds and tubers. The term also describes one of the two major cell types of the endosperm, the aleurone layer. The aleurone layer is the outermost layer of the endosperm, followed by the inner starchy endosperm. This layer of cells is sometimes referred to as the peripheral endosperm. It lies between the pericarp and the hyaline layer of the endosperm. Unlike the cells of the starchy endosperm, aleurone cells remain alive at maturity. The ploidy of the aleurone is (3n) [as a result of double fertilization].

<span class="mw-page-title-main">Corn kernel</span> Fruit of corn

Corn kernels are the fruits of corn. Maize is a grain, and the kernels are used in cooking as a vegetable or a source of starch. The kernel comprise endosperm, germ, pericarp, and tip cap.

<span class="mw-page-title-main">Waxy corn</span> Type of field corn

Waxy corn or glutinous corn is a type of field corn characterized by its sticky texture when cooked as a result of larger amounts of amylopectin. The corn was first described from a specimen from China in 1909. As this plant showed many peculiar traits, the American breeders long used it as a genetic marker to tag the existence of hidden genes in other maize breeding programs. In 1922 a researcher found that the endosperm of waxy maize contained only amylopectin and no amylose starch molecule in opposition to normal dent corn varieties that contain both. Until World War II, the main source of starch in the United States was tapioca, but when Japan severed the supply lines of the U.S., they forced processors to turn to waxy maize. Amylopectin or waxy starch is now used mainly in food products, but also in the textile, adhesive, corrugating and paper industry.

<span class="mw-page-title-main">Wheat berry</span> Whole wheat kernel without the husk

A wheat berry, or wheatberry, is a whole wheat kernel, composed of the bran, germ, and endosperm, without the husk. Botanically, it is a type of fruit called a caryopsis. Wheat berries have a tan to reddish-brown color and are available as either a hard or soft processed grain They are often added to salads or baked into bread to add a chewy texture. If wheat berries are milled, whole-wheat flour is produced. Wheatberries are similar to barley, with a somewhat nuttier taste.

<span class="mw-page-title-main">Guatemalan cuisine</span> Culinary traditions of Guatemala

Most traditional foods in Guatemalan cuisine are based on Maya cuisine, with Spanish influence, and prominently feature corn, chilies and beans as key ingredients. Guatemala is famously home to the Hass avocado.

<span class="mw-page-title-main">Flint corn</span> Variety of maize

Flint corn is a variant of maize, the same species as common corn. Because each kernel has a hard outer layer to protect the soft endosperm, it is likened to being hard as flint, hence the name. The six major types of corn are dent corn, flint corn, pod corn, popcorn, flour corn, and sweet corn.

<span class="mw-page-title-main">Belizean cuisine</span> Culinary traditions of Belize

Belizean cuisine is an amalgamation of all ethnicities in the nation of Belize and their respectively wide variety of foods. Breakfast often consists of sides of bread, flour tortillas, or fry jacks that are often homemade and eaten with various cheeses. All are often accompanied with refried beans, cheeses, and various forms of eggs, etc. Inclusive is also cereal along with milk, coffee, or tea.

<span class="mw-page-title-main">Maize</span> Genus of grass cultivated as a food crop

Maize, also known as corn in North American and Australian English, is a tall stout grass that produces cereal grain. It was domesticated by indigenous peoples in southern Mexico about 9,000 years ago from wild teosinte. Native Americans planted it alongside beans and squashes in the Three Sisters polyculture. The leafy stalk of the plant gives rise to male inflorescences or tassels which produce pollen, and female inflorescences called ears which yield grain, known as kernels or seeds. In modern commercial varieties, these are usually yellow or white; other varieties can be of many colors.

<span class="mw-page-title-main">Dent corn</span> Variety of corn

Dent corn, also known as grain corn, is a type of field corn with a high soft starch content. It received its name because of the small indentation, or "dent", at the crown of each kernel on a ripe ear of corn. Reid's Yellow Dent is a variety developed by central Illinois farmer James L. Reid. Reid and his father, Robert Reid, moved from Brown County, Ohio, to Tazewell County, Illinois, in 1846 bringing with them a red corn variety known as "Johnny Hopkins", and crossed it with varieties of flint corn and flour corn. Most of today's hybrid corn varieties and cultivars are derived from it. This variety won a prize at the 1893 World's Fair.

<span class="mw-page-title-main">Mazamorra</span> Beverage from Iberia or Hispanic America

Mazamorra or masamorra is the name for numerous traditional dishes from the Iberian Peninsula and Hispanic America.

<span class="mw-page-title-main">Xenia (plants)</span>

Xenia in plants is the effect of pollen on seeds and fruit of the fertilized plant. The effect is separate from the contribution of the pollen towards the next generation.

References

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