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Barley
Drawing of Barley
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Monocots
(unranked):
Commelinids
Order:
Poales
Family:
Poaceae
Subfamily:
Pooideae
Tribe:
Triticeae
Genus:
Hordeum
Species:
H. vulgare[1]
Binomial name
Hordeum vulgare
Synonyms[2]
List
    • Frumentum hordeum E.H.L.Krause nom. illeg.
    • Frumentum sativum E.H.L.Krause
    • Hordeum aestivum R.E.Regel nom. inval.
    • Hordeum americanum R.E.Regel nom. inval.
    • Hordeum bifarium Roth
    • Hordeum brachyatherum R.E.Regel nom. inval.
    • Hordeum caspicum R.E.Regel nom. inval.
    • Hordeum coeleste (L.) P.Beauv.
    • Hordeum daghestanicum R.E.Regel nom. inval.
    • Hordeum defectoides R.E.Regel nom. inval.
    • Hordeum durum R.E.Regel nom. inval.
    • Hordeum elongatum R.E.Regel nom. inval.
    • Hordeum gymnodistichum Duthie
    • Hordeum heterostychon P.Beauv. [Spelling variant]
    • Hordeum hexastichon L.
    • Hordeum hibernaculum R.E.Regel nom. inval.
    • Hordeum hibernans R.E.Regel nom. inval.
    • Hordeum himalayense Schult.
    • Hordeum hirtiusculum R.E.Regel nom. inval.
    • Hordeum horsfordianum R.E.Regel nom. inval.
    • Hordeum ircutianum R.E.Regel nom. inval.
    • Hordeum jarenskianum R.E.Regel nom. inval.
    • Hordeum juliae R.E.Regel nom. inval.
    • Hordeum kalugense R.E.Regel nom. inval.
    • Hordeum karzinianum R.E.Regel nom. inval.
    • Hordeum kiarchanum R.E.Regel nom. inval.
    • Hordeum laevipaleatum R.E.Regel nom. inval.
    • Hordeum lapponicum R.E.Regel nom. inval.
    • Hordeum leptostachys Griff.
    • Hordeum macrolepis A.Braun
    • Hordeum mandshuricum R.E.Regel nom. inval.
    • Hordeum mandshuroides R.E.Regel nom. inval.
    • Hordeum michalkowii R.E.Regel nom. inval.
    • Hordeum nekludowii R.E.Regel nom. inval.
    • Hordeum nigrum Willd.
    • Hordeum pamiricum Vavilov nom. inval.
    • Hordeum parvum R.E.Regel nom. inval.
    • Hordeum pensanum R.E.Regel nom. inval.
    • Hordeum polystichon Haller
    • Hordeum praecox R.E.Regel nom. inval.
    • Hordeum pyramidatum R.E.Regel nom. inval.
    • Hordeum revelatum (Körn.) A.Schulz
    • Hordeum sativum Jess. nom. illeg.
    • Hordeum sativum Pers. nom. inval.
    • Hordeum scabriusculum R.E.Regel nom. inval.
    • Hordeum septentrionale R.E.Regel nom. inval.
    • Hordeum stassewitschii R.E.Regel nom. inval.
    • Hordeum strobelense Chiov.
    • Hordeum taganrocense R.E.Regel nom. inval.
    • Hordeum tanaiticum R.E.Regel nom. inval.
    • Hordeum tetrastichum Stokes
    • Hordeum transcaucasicum R.E.Regel nom. inval.
    • Hordeum violaceum R.E.Regel nom. inval.
    • Hordeum walpersii R.E.Regel nom. inval.
    • Secale orientale Schreb. ex Roth nom. inval.

Barley (Hordeum vulgare L.), a member of the grass family, is a major cereal grain grown in temperate climates globally. It was one of the first cultivated grains, particularly in Eurasia as early as 13,000 years ago. Barley has also been used as animal fodder, as a source of fermentable material for beer and certain distilled beverages, and as a component of various health foods. It is used in soups and stews, and in barley bread of various cultures. Barley grains are commonly made into malt in a traditional and ancient method of preparation.

In a 2007 ranking of cereal crops in the world, barley was fourth both in terms of quantity produced (136 million tons) and in area of cultivation (566,000 square kilometres or 219,000 square miles).[3]

Etymology

The Old English word for 'barley' was bære, which traces back to Proto-Indo-European and is cognate to the Latin word farina "flour". The direct ancestor of modern English "barley" in Old English was the derived adjective bærlic, meaning "of barley".[4] The first citation of the form bærlic in the Oxford English Dictionary dates to around 966 CE, in the compound word bærlic-croft.[5] The underived word bære survives in the north of Scotland as bere, and refers to a specific strain of six-row barley grown there.[6] The word barn, which originally meant "barley-house", is also rooted in these words.[4]

Biology

Barley
The cross-section of a barley root

Barley is a member of the grass family. It is a self-pollinating, diploid species with 14 chromosomes. The wild ancestor of domesticated barley, Hordeum vulgare subsp. spontaneum, is abundant in grasslands and woodlands throughout the Fertile Crescent area of Western Asia and northeast Africa, and is abundant in disturbed habitats, roadsides and orchards. Outside this region, the wild barley is less common and is usually found in disturbed habitats.[7] However, in a study of genome-wide diversity markers, Tibet was found to be an additional center of domestication of cultivated barley.[8]

Domestication

Wild barley has a brittle spike; upon maturity, the spikelets separate, facilitating seed dispersal. Domesticated barley has nonshattering spikes, making it much easier to harvest the mature ears.[7] The nonshattering condition is caused by a mutation in one of two tightly linked genes known as Bt1 and Bt2; many cultivars possess both mutations. The nonshattering condition is recessive, so varieties of barley that exhibit this condition are homozygous for the mutant allele.[7][clarification needed]

Two-row and six-row barley

Two-row and six-row barley

Spikelets are arranged in triplets which alternate along the rachis. In wild barley (and other Old World species of Hordeum), only the central spikelet is fertile, while the other two are reduced. This condition is retained in certain cultivars known as two-row barleys. A pair of mutations (one dominant, the other recessive) result in fertile lateral spikelets to produce six-row barleys.[7] Recent genetic studies have revealed that a mutation in one gene, vrs1, is responsible for the transition from two-row to six-row barley.[9]

Two-row barley has a lower protein content than six-row barley, thus a more fermentable sugar content. High-protein barley is best suited for animal feed. Malting barley is usually lower protein[10] ("low grain nitrogen", usually produced without a late fertilizer application) which shows more uniform germination, needs shorter steeping, and has less protein in the extract that can make beer cloudy. Two-row barley is traditionally used in English ale-style beers. Six-row barley is common in some American lager-style beers, especially when adjuncts such as corn and rice are used, whereas two-row malted summer barley is preferred for traditional German beers.

Hulless barley

Hulless or "naked" barley (Hordeum vulgare L. var. nudum Hook. f.) is a form of domesticated barley with an easier-to-remove hull. Naked barley is an ancient food crop, but a new industry has developed around uses of selected hulless barley to increase the digestible energy of the grain, especially for swine and poultry.[11] Hulless barley has been investigated for several potential new applications as whole grain, and for its value-added products. These include bran and flour for multiple food applications.[12]

Classification

Barley

In traditional classifications of barley, these morphological differences have led to different forms of barley being classified as different species. Under these classifications, two-rowed barley with shattering spikes (wild barley) is classified as Hordeum spontaneum K. Koch. Two-rowed barley with nonshattering spikes is classified as H. distichum L., six-row barley with nonshattering spikes as H. vulgare L. (or H. hexastichum L.), and six-row with shattering spikes as H. agriocrithon Åberg.

Because these differences were driven by single-gene mutations, coupled with cytological and molecular evidence, most recent classifications treat these forms as a single species, H. vulgare L.[7]

Cultivars

Vocabulary
  • DON: Acronym for deoxynivalenol, a toxic byproduct of Fusarium head blight, also known as vomitoxin.
  • Heading date: A parameter in barley cultivation.[13]
  • Lodging: The bending over of the stems near ground level.
  • Nutans: A designation for a variety with a lax ear, as opposed to 'erectum' (with an erect ear).
  • QCC: A pathotype of stem rust (Puccinia graminis f. sp. tritici).
  • Rachilla: The part of a spikelet that bears the florets. The length of the rachilla hairs is a characteristic of barley varieties.
Cultivars
  • 'Azure', a six-rowed, blue-aleurone malting barley released in 1982. It was high-yielding with strong straw, but was susceptible to loose smut.
  • 'Beacon', a six-rowed malting barley with rough awns, short rachilla hairs and colorless aleurone. Released in 1973, it was the first North Dakota State University (NDSU) barley that had resistance to loose smut.
  • Bere, a six-row barley currently cultivated mainly on 5-15 hectares of land in Orkney, Scotland. Two additional parcel on the island of Islay, Scotland were planted in 2006 for Bruichladdich Distillery.
  • 'Betzes', an old German two-row barley introduced into North America from Kraków, Poland, by the United States Department of Agriculture (USDA).[14] The Montana and Idaho agricultural experiment stations released Betzes in 1957. It is a midshort, medium-strength-strawed, midseason-maturing barley. It has a midsize-to-large kernel with yellow aleurone. Betzes is susceptible to loose and covered smuts, rusts, and scald.
  • 'Bowman', a two-rowed, smooth-awned variety jointly released by NDSU and USDA in 1984 as a feed barley spring variety developed in North Dakota. It has good test weight and straw strength. It is resistant to wheat stem rust but is susceptible to loose smut and barley yellow dwarf virus.
  • 'Celebration', a variety developed by the barley breeding program at Busch Agricultural Resources and released in 2008. Through a collaborative agreement between the North Dakota State University Foundation Seedstocks (NDFSS) project and Busch Agricultural Resources, all foundation seed of Celebration barley will be produced and distributed by the NDFSS. Celebration has excellent agronomic performance and malt quality. It is a Midwestern variety, well-adapted for Minnesota, North Dakota, Idaho, and Montana, with medium-early maturity, medium-early heading, medium-short height, mid-lax head type, rough awns, short rachilla hairs, and colorless aleurone, moderately resistant to Septoria and net blotch. It has improved reaction to Fusarium head blight and consistently lower DON content.
  • 'Centennial', a Canadian variety developed from the cross of Lenta x Sanalta by the University of Alberta. It is a two-row, relatively short, stiff-strawed, late-maturing variety. The kernel is midlong with yellow aleurone. It was released as a feed barley.
  • 'Compana', an American variety developed from a composite cross by the Idaho and Montana Agricultural Experiment Stations in cooperation with the USDA's Plant Science Research Division. It was released by Montana in 1941. Compana is a two-row variety with moderately weak straw, midshort with midseason maturity. The kernels are long and wide with yellow aleurone. This variety is resistant to loose smut and moderately resistant to covered smut.
  • 'Conlon', a two-row barley released by NDSU in 1996. Test weight and yield is better than Bowman. Yield is equal to Stark. Conlon heads earlier than Bowman and shows good heat tolerance by kernel plumpness. It is resistant to powdery mildew and net blotch but is moderately susceptible to spot blotch. It is prone to lodging under high-yield growing conditions. It appears best adapted to western North Dakota and adjacent western states.
  • 'Diamant', a Czech high-yield, short-height, mutant variety created with X-rays.
  • 'Dickson', a six-row, rough-awned variety released by NDSU in 1965. It had good straw strength and was resistant to stem rust but susceptible to loose smut. Dickson had more resistance to prevalent leaf spot diseases than Trophy, Larker and Traill. It was similar to Trophy in heading date, plant height and straw strength. It had less plumpness than Trophy and Larker but more than Traill and Kindred.
  • 'Drummond', a six-row malting variety released by NDSU in 2000. It has white aleurone, long rachilla hairs and semi-smooth awns. Drummond has better straw strength than current six-row varieties. Heading date is similar to Robust and plant height is similar to Stander. It is resistant to spot blotch and moderately susceptible to net blotch. However, its net blotch resistance is better than any current variety. Fusarium head blight reaction is similar to that of Robust. It is resistant to prevalent races of wheat stem rust but is susceptible to pathotype Pgt-QCC. Drummond is on the American Malting Barley Association's list of recommended varieties. In two years of plant scale evaluation, Drummond was found satisfactory by Anheuser-Busch, Inc. and Miller Brewing.
  • 'Excel', a six-row, white-aleurone malting barley released by Minnesota in 1990. Shorter in height than other six-row barleys grown at that time, it is high-yielding with medium-early maturity, moderately strong straw, smooth awns and long rachilla hairs. It has high resistance to stem rust and moderate resistance to spot blotch but is susceptible to loose smut. Malting traits are equal or greater than Morex with plum kernel percentage lower than Robust.
  • 'Foster', a six-row, white-aleurone malting barley released by NDSU in 1995. About one day earlier and slightly shorter than Robust, it is higher-yielding than Morex, Robust and Hazen. Straw strength is similar to Excel and Stander but better than Robust. It is moderately susceptible to net blotch but resistant to spot blotch. Protein is 1.5 percent lower than Robust and Morex.
  • 'Glenn', a six-row, white-aleurone variety released by NDSU in 1978. Glenn was resistant to prevalent races of loose and covered smut with better resistance to leaf spot diseases than Larker. It matured about two days earlier than Larker and yielded about 10 percent more than Larker and Beacon.
  • 'Golden Promise', an English semi-dwarf, salt-tolerant mutant variety (created with gamma rays[15]) used to make beer and whiskey.
  • 'Hazen', a six-row, smooth-awn, white-aleurone feed barley released by NDSU in 1984. Hazen heads two days later than Glenn. It is susceptible to loose smut.
  • Highland barley, a crop cultivated on the Tibetan Plateau.
  • 'Kindred', released in 1941 and developed from a selection made by S.T. Lykken, a Kindred, North Dakota farmer. It was a six-row, rough-awned, medium-early Manchurian-type malting variety that gave good yields. Kindred had stem rust resistance but was moderately susceptible to spot blotch and Septoria. It was less susceptible to blight and root rot than Wisconsin 38. It was medium-height with weak straw.
  • 'Kindred L', a re-selection made to eliminate blue Manchurian types.
  • 'Larker', a six-rowed, semi-smooth-awn malting barley first released in 1961. It was medium-maturity with moderate straw strength and medium height. Larker was rust-resistant but susceptible to leaf diseases and loose smut. It was superior to all other malt varieties for kernel plumpness at the time of release.
  • 'Logan', released by NDSU in 1995, is classed as a non-malting barley. It is a white-aleurone, two-row barley similar to Bowman in heading date and plant height and similar to Morex for foliar diseases. It has better yield, test weight, and lodging score, and lower protein, than Bowman and Morex.
  • 'Lux', a Danish variety.[16]
  • 'Manchurian', a blue-aleurone malting variety released by NDSU in 1922. It had weak to moderate-stiff straw and was susceptible to stem rust. It was developed from false stripe virus-free stock.
  • 'Manscheuri', also designated Accession No. 871, a six-row barley that may have been first released by NDSU before 1904. It outyielded most of the common types being grown in North Dakota at the time. It had stiffer straw than varieties at the time and a longer head filled with large, plump kernels.
  • 'Mansury', also designated Accession No. 172, a two-row barley first released by NDSU in about 1905.
  • Maris Otter, an English two-row winter variety commonly used in the production of malt for the brewing industry, no longer on the recommended list of approved malting barley varieties. Despite this, it remains popular for Craft Beer and among homebrewers.
  • 'Morex', a six-row, white-aleurone, smooth-awn malting variety released by Minnesota in 1978. Morex, which stands for "more extract", is highly resistant to stem rust, moderate to spot blotch and susceptible to loose smut.
  • 'Nordal', a spring nutans variety from Carlsberg, Sweden released in 1971.[17][18]
  • 'Nordic', a six-rowed, colorless-aleurone feed barley released in 1971. It had rough awns and short rachilla hairs. Yield was similar to Dickson but greater than Larker. Kernel plumpness and test weight was superior to Dickson but less than Larker. Lodging, spot and net blotch resistance was similar to Dickson but it had higher resistance to Septoria leaf blotch. It showed less leaf rust symptoms compared to other varieties at the time.
  • 'Optic'
  • 'Park', a six-row, white-aleurone malting barley released in 1978. Park had better resistance to leaf spot diseases, spot blotch, net blotch and Septoria leaf blotch than Larker.
  • 'Plumage Archer', an English malt variety.
  • 'Pearl'
  • 'Pinnacle', a variety released by the North Dakota Agricultural Experiment Station in 2006. Pinnacle has high yield, low protein, long rachilla hairs, smooth awns, white aleurone, medium-late maturity, medium height and strong straw strength.
  • 'Proctor', a parent cultivar of 'Maris Otter'.
  • 'Pioneer', a parent cultivar of 'Maris Otter'.
  • 'Rawson', a variety developed by the NDSU Barley Breeding Program and released by the North Dakota Agricultural Experiment Station in 2005. Rawson's general characteristics were very large kernels, loose hull, long rachilla hairs, rough awns, white aleurone, medium maturity, medium height, and medium straw strength.
  • 'Robust', a six-row, white-aleurone malting variety released by Minnesota in 1983. Maturity is two days later than Morex.
  • 'Sioux', a selection from Tregal released by NDSU. It was a six-row, medium-early variety with white aleurone, rough awns and long rachilla hairs. It was high-yielding with plump kernels. Its disease reaction was similar to Tregal.
  • 'Stark', a two-row non-malting barley released by NDSU in 1991. It has stiff straw and large kernels, and appears best adapted to western North Dakota and adjacent western states. Stark is about one day later and two inches shorter to Bowman, with equal or better test weight. Stark yields about 10 percent better than Bowman. It is moderately resistant to net and spot blotch but is susceptible to loose smut, leaf rust and the QCC race of wheat stem rust.
  • 'Tradition', a variety with excellent agronomic performance and malt quality, well-adapted to Minnesota, North Dakota, Idaho and Montana. Tradition has medium relative maturity, medium-short height, and very strong straw. Tradition has a nodding head type, semi-smooth awns, long rachilla hairs and white aleurone.
  • 'Traill', a medium-early, rough-awn, white-aleurone malting variety released by NDSU in 1956. It was resistant to stem rust and had the same reaction to spot blotch and Septoria as Kindred. Traill had greater yield and straw strength than Kindred but had smaller kernel size.
  • 'Tregal', a high-yield, smooth-awn, six-row feed barley released by NDSU in 1943. It was medium-early with short, stiff straw, erect head, and high resistance to loose smut. Tregal was similar to Kindred for reaction to spot blotch with similar tolerance to Septoria.
  • 'Trophy', a six-row, rough-awn malting variety with colorless aleurone released by NDSU in 1964. Similar to Traill and Kindred in plant height, heading date and test weight, it had a higher percentage of plump kernels. Its yield in North Dakota was greater than Kindred and similar to Traill. Similar to Kindred and Traill, it was resistant to stem rust but susceptible to loose smut and Septoria leaf blotch. Trophy had some field resistance to net blotch. It had greater straw strength than Kindred. Trophy had greater enzymatic activity and quality than Traill.
  • 'Windich', a Western Australian grain cultivar named after Tommy Windich (c. 1840–c. 1876).
  • 'Yagan', a Western Australian grain cultivar named after Yagan (c. 1795-1833).[19]

Chemistry

H. vulgare contains the phenolics caffeic acid and p-coumaric acid, the ferulic acid 8,5'-diferulic acid, the flavonoids catechin-7-O-glucoside,[20] saponarin,[21] catechin, procyanidin B3, procyanidin C2, and prodelphinidin B3, and the alkaloid hordenine.

History

An account of barley rations issued monthly to adults (30 or 40 pints) and children (20 pints) written in cuneiform on clay tablet, written in year 4 of King Urukagina (circa 2350 BCE), from Girsu, Iraq, British Museum, London

Barley was one of the first domesticated grains in the Fertile Crescent, an area of relatively abundant water in Western Asia, and near the Nile river of northeast Africa.[22] The grain appeared in the same time as einkorn and emmer wheat.[23] Wild barley (H. vulgare ssp. spontaneum) ranges from North Africa and Crete in the west, to Tibet in the east.[7] The earliest evidence of wild barley in an archaeological context comes from the Epipaleolithic at Ohalo II at the southern end of the Sea of Galilee. The remains were dated to about 8500 BCE.[7] The earliest domesticated barley occurs at aceramic ("pre-pottery") Neolithic sites, in the Near East such as the Pre-Pottery Neolithic B layers of Tell Abu Hureyra, in Syria. By 4200 BCE domesticated barley occurs as far as in Eastern Finland.[24] Barley has been grown in the Korean Peninsula since the Early Mumun Pottery Period (circa 1500–850 BCE) along with other crops such as millet, wheat, and legumes.[25]

Barley (known as Yava in both Vedic and Classical Sanskrit),is mentioned many times in Rigveda and other Indian scriptures as one of the principal grain in ancient India.[26]Traces of Barley cultivation have also been found in post-Neolithic Bronze Age Harappan civilization 5700-3300 years before present.[27]

In the Pulitzer Prize-winning book Guns, Germs, and Steel, Jared Diamond proposed that the availability of barley, along with other domesticable crops and animals, in southwestern Eurasia significantly contributed to the broad historical patterns that human history has followed over approximately the last 13,000 years; i.e., why Eurasian civilizations, as a whole, have survived and conquered others.[28]

Barley beer was probably one of the first alcoholic drinks developed by Neolithic humans.[29] Barley later on was used as currency.[29] Alongside emmer wheat, barley was a staple cereal of ancient Egypt, where it was used to make bread and beer. The general name for barley is jt (hypothetically pronounced "eat"); šma (hypothetically pronounced "SHE-ma") refers to Upper Egyptian barley and is a symbol of Upper Egypt. The Sumerian term is akiti. According to Deuteronomy 8:8, barley is one of the "Seven Species" of crops that characterize the fertility of the Promised Land of Canaan, and it has a prominent role in the Israelite sacrifices described in the Pentateuch (see e.g. Numbers 5:15). A religious importance extended into the Middle Ages in Europe, and saw barley's use in justice, via alphitomancy and the corsned.

Barley in Egyptian hieroglyphs
jt barley determinative/ideogram
M34
jt (common) spelling
itU9
M33
šma determinative/ideogram
U9

Rations of barley for workers appear in Linear B tablets in Mycenaean contexts at Knossos and at Micenaean Pylos.[30] In mainland Greece, the ritual significance of barley possibly dates back to the earliest stages of the Eleusinian Mysteries. The preparatory kykeon or mixed drink of the initiates, prepared from barley and herbs, referred in the Homeric hymn to Demeter, whose name some scholars believe meant "Barley-mother".[31] The practice was to dry the barley groats and roast them before preparing the porridge, according to Pliny the Elder's Natural History (xviii.72). This produces malt that soon ferments and becomes slightly alcoholic.

Pliny also noted barley was a special food of gladiators known as hordearii, "barley-eaters". However, by Roman times, he added that wheat had replaced barley as a staple.[32]

Tibetan barley has been a staple food in Tibetan cuisine since the fifth century CE. This grain, along with a cool climate that permitted storage, produced a civilization that was able to raise great armies.[33] It is made into a flour product called tsampa that is still a staple in Tibet.[34] The flour is roasted and mixed with butter and butter tea to form a stiff dough that is eaten in small balls.

In medieval Europe, bread made from barley and rye was peasant food, while wheat products were consumed by the upper classes.[32] Potatoes largely replaced barley in Eastern Europe in the 19th century.[35]

Genetics

The genome of barley was sequenced in 2012,[36] due to the efforts of the International Barley Genome Sequencing consortium and also the UK Barley Sequencing Consortium.

The genome is composed of seven pairs of nuclear chromosomes (recommended designations: 1H, 2H, 3H, 4H, 5H, 6H and 7H), and one mitochondrial and one chloroplastic chromosome, with a total of 5000 Mbp.[37]

Abundant biological information is already freely available in several barley databases.[38]

Production

Top barley producers in millions of metric tons[39]
Rank Country 2011 2012 2013
01  Russia 16.9 14.0 15.4
02  Germany 8.7 10.4 10.3
03  France 8.8 11.3 10.3
04  Canada 7.8 8.0 10.2
05  Spain 8.3 6.0 10.1
06  Turkey 7.6 7.1 7.9
07  Ukraine 9.1 6.9 7.6
08  Australia 8.0 8.2 7.5
09  United Kingdom 5.5 5.5 7.1
10  Argentina 4.1 5.2 4.7
— World total 134.3 133.5 144.8

Barley was grown in about 100 countries worldwide in 2013. The world production in 1974 was 148,818,870 tonnes; since then, there has been a slight decline in the amount of barley produced worldwide.[32] Upon the results of 2011, Ukraine was the world leader in barley export.[40]

Cultivation

Barley harvesting in Gaziantep, Turkey

Barley is a widely adaptable crop. It is currently popular in temperate areas where it is grown as a summer crop and tropical areas where it is sown as a winter crop. Its germination time is one to three days. Barley grows under cool conditions, but is not particularly winter hardy.

Barley is more tolerant of soil salinity than wheat, which might explain the increase of barley cultivation in Mesopotamia from the second millennium BCE onwards. Barley is not as cold tolerant as the winter wheats (Triticum aestivum), fall rye (Secale cereale) or winter triticale (× Triticosecale Wittm. ex A. Camus.), but may be sown as a winter crop in warmer areas of Australia and Great Britain.

Barley has a short growing season and is also relatively drought tolerant.[32]

Plant diseases

Main article: List of barley diseases

This plant is known or likely to be susceptible to barley mild mosaic bymovirus,[41][42] as well as bacterial blight. It can be susceptible to many diseases, but plant breeders have been working hard to incorporate resistance. The devastation caused by any one disease will depend upon the susceptibility of the variety being grown and the environmental conditions during disease development. Serious diseases of barley include powdery mildew caused by Blumeria graminis f.sp. hordei, leaf scald caused by Rhynchosporium secalis, barley rust caused by Puccinia hordei, crown rust caused by Puccinia coronata, and various diseases caused by Cochliobolus sativus. Barley is also susceptible to head blight.

Food

Raw barley
Nutritional value per 100 g (3.5 oz)
Energy1,473 kJ (352 kcal)
77.7 g
Sugars0.8 g
Dietary fiber15.6 g
1.2 g
9.9 g
Vitamins and minerals
VitaminsQuantity
%DV†
Vitamin A equiv.
0%
13 μg
160 μg
Thiamine (B1)
16%
0.191 mg
Riboflavin (B2)
9%
0.114 mg
Niacin (B3)
29%
4.604 mg
Pantothenic acid (B5)
6%
0.282 mg
Vitamin B6
15%
0.26 mg
Folate (B9)
6%
23 μg
Choline
7%
37.8 mg
Vitamin C
0%
0 mg
Vitamin K
2%
2.2 μg
MineralsQuantity
%DV†
Calcium
2%
29 mg
Iron
14%
2.5 mg
Magnesium
19%
79 mg
Manganese
57%
1.322 mg
Phosphorus
18%
221 mg
Potassium
9%
280 mg
Sodium
0%
9 mg
Zinc
19%
2.13 mg
Full Link to USDA Database entry
†Percentages estimated using US recommendations for adults,[43] except for potassium, which is estimated based on expert recommendation from the National Academies.[44]

Nutrition

Barley, oats, and some products made from them

In a 100 gram serving, raw barley provides 352 calories and is a rich source (20% or more of the Daily Value, DV) of essential nutrients, including protein, dietary fiber, the B vitamins, niacin (31% DV) and vitamin B6 (20% DV), and several dietary minerals (table). Highest nutrient contents are for manganese (63% DV) and phosphorus (32% DV) (table). Raw barley is 78% carbohydrates, 1% fat, 10% protein and 10% water (table).

Preparation

Hulled barley (or covered barley) is eaten after removing the inedible, fibrous, outer hull. Once removed, it is called dehulled barley (or pot barley or scotch barley).[45] Considered a whole grain, dehulled barley still has its bran and germ, making it a nutritious and popular health food. Pearl barley (or pearled barley) is dehulled barley which has been steam processed further to remove the bran.[45] It may be polished, a process known as "pearling". Dehulled or pearl barley may be processed into a variety of barley products, including flour, flakes similar to oatmeal, and grits.

Barley meal, a wholemeal barley flour lighter than wheat meal but darker in colour, is used in porridge and gruel in Scotland.[45] Barley meal gruel is known as sawiq in the Arab world.[46] With a long history of cultivation in the Middle East, barley is used in a wide range of traditional Arabic, Assyrian, Israelite, Kurdish, and Persian foodstuffs including kashkak, kashk and murri. Barley soup is traditionally eaten during Ramadan in Saudi Arabia.[47] Cholent or hamin (in Hebrew) is a traditional Jewish stew often eaten on Sabbath, in a variety of recipes by both Mizrachi and Ashkenazi Jews, with barley cited throughout the Hebrew Bible in multiple references. In Eastern and Central Europe, barley is also used in soups and stews such as ričet. In Africa, where it is a traditional food plant, it has the potential to improve nutrition, boost food security, foster rural development and support sustainable landcare.[48]

The six-row variety bere is cultivated in Orkney, Shetland, Caithness and the Western Isles in the Scottish Highlands and islands. When milled into beremeal it is used locally in bread, biscuits, and the traditional beremeal bannock.[49]

Health implications

The Reinheitsgebot law of 15th century Holy Roman Empire allowed only barley to be the grain used for beer brewing (Czech beer Budweiser Budvar depicted).

According to Health Canada and the US FDA, consuming at least 3 grams per day of barley beta-glucan or 0.75 grams per serving of soluble fiber can lower levels of blood cholesterol, a risk factor for cardiovascular diseases.[50][51]

Eating whole-grain barley, as well as other grains with lots of fiber, improves regulation of blood sugar (i.e. reduce blood glucose response to a meal).[52] Consuming breakfast cereals containing barley over weeks to months also improved cholesterol levels and glucose regulation.[53]

Like wheat, rye, and their hybrids and derivatives, barley contains gluten, which makes it an unsuitable grain for consumption by people with gluten-related disorders, such as celiac disease, non-celiac gluten sensitivity and wheat allergy sufferers, among others.[54] Nevertheless, some wheat allergy patients can tolerate barley or rye.[55]

Beverages

See also: List of barley-based beverages

Alcoholic beverages

An employee of the Springbank distillery turning the barley on the floor malting

Half of the United States' barley production is used as livestock feed.[56] A large part (about 25%) of the remainder is used for malting, for which barley is the best-suited grain.[57] It is a key ingredient in beer and whisky production. Two-row barley is traditionally used in German and English beers. Six-row barley was traditionally used in US beers, but both varieties are in common usage now.[58] Distilled from green beer,[59] whisky has been made primarily from barley in Ireland and Scotland, while other countries have used more diverse sources of alcohol, such as the more common corn, rye and wheat in the USA. In the US, a grain type may be identified on a whisky label if that type of grain constitutes 51% or more of the ingredients and certain other conditions are satisfied.[60]

Barley wine is a style of strong beer from the English brewing tradition. Another alcoholic drink known by the same name, enjoyed in the 18th century, was prepared by boiling barley in water, then mixing the barley water with white wine and other ingredients, such as borage, lemon and sugar. In the 19th century, a different barley wine was made prepared from recipes of ancient Greek origin.[4]

Nonalcoholic beverages

Nonalcoholic drinks such as barley water[4] and roasted barley tea[61] have been made by boiling barley in water. In Italy, barley is also sometimes used as coffee substitute, caffè d'orzo (coffee of barley). This drink is obtained from ground, roasted barley and it is prepared as an espresso (it can be prepared using percolators, filter machines or cafetieres). It became widely used during the Fascist period and WWII, as Italy was affected by embargo and struggled to import coffee. It was also a cheaper option for poor families (often grown and roasted at home) in the period. Afterwards, it was promoted and sold as a coffee substitute for children. Nowadays, it is experiencing a revival and it can be considered some Italians' favourite alternative to coffee when, for health reasons, caffeine drinks are not recommended.

Other uses

Animal feed

Half of the United States' barley production is used as livestock feed.[62] Barley is an important feed grain in many areas of the world not typically suited for maize production, especially in northern climates—for example, northern and eastern Europe. Barley is the principal feed grain in Canada, Europe, and in the northern United States.[63] A finishing diet of barley is one of the defining characteristics of western Canadian beef used in marketing campaigns.[64]

As of 2014, an enzymatic process can be used to make a high-protein fish feed from barley, which is suitable for carnivorous fish such as trout and salmon.[65]

Algicide

Barley straw used in a pond in Oud-Heverlee, Belgium

Barley straw, in England, is placed in mesh bags and floated in fish ponds or water gardens to help reduce algal growth without harming pond plants and animals. Barley straw has not been approved by the EPA for use as a pesticide and its effectiveness as an algicide in ponds has produced mixed results during university testing in the US and the UK.[66]

Measurement

Barley grains were used for measurement in England, there being three or four barleycorns to the inch and four or five poppy seeds to the barleycorn.[67] The statute definition of an inch was three barleycorns, although by the 19th century, this had been superseded by standard inch measures.[68] This unit still persists in the shoe sizes used in Britain and the USA.[69]

As modern studies show, the actual length of a kernel of barley varies from as short as 4–7 mm (0.16–0.28 in) to as long as 12–15 mm (0.47–0.59 in) depending on the cultivar.[70][71] Older sources claimed the average length of a grain of barley being 0.345 in (8.8 mm).[72]

The barleycorn was known as arpa in Turkish, and the feudal system in Ottoman Empire employed the term arpalik, or "barley-money", to refer to a second allowance made to officials to offset the costs of fodder for their horses.[73]

Ornamental

A new stabilized variegated variety of Hordeum vulgare, billed as Hordeum vulgare varigate, has been introduced for cultivation as an ornamental and pot plant for pet cats to nibble.[74]

Cultural

The Islamic prophet Muhammad prescribed barley (talbina) for seven diseases.[75] It was also said[by whom?] to soothe and calm the bowels. Avicenna, in his 11th century work The Canon of Medicine, wrote of the healing effects of barley water, soup and broth for fevers.[76] Additionally, barley can be roasted and turned into roasted barley tea, a popular Asian drink.

In English folklore, the figure of John Barleycorn in the folksong of the same name is a personification of barley, and of the alcoholic beverages made from it, beer and whisky. In the song, John Barleycorn is represented as suffering attacks, death, and indignities that correspond to the various stages of barley cultivation, such as reaping and malting. He may be related to older pagan gods, such as Mímir or Kvasir.[77]

References

Notes

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Bibliography

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