Rye

Rye (Secale cereale) is a grass grown extensively as a grain, a cover crop and a forage crop. It is a member of the wheat tribe (Triticeae) and is closely related to both wheat (Triticum) and barley (genus Hordeum).[1] Rye grain is used for flour, bread, beer, crispbread, some whiskeys, some vodkas, and animal fodder. It can also be eaten whole, either as boiled rye berries or by being rolled, similar to rolled oats.

For other uses, see Rye (disambiguation).

Rye
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Poaceae
Subfamily: Pooideae
Genus: Secale
Species:
S. cereale
Binomial name
Secale cereale
Synonyms

Secale fragile M.Bieb.

Rye is a cereal grain and should not be confused with ryegrass, which is used for lawns, pasture, and hay for livestock.

History
Rye grains

Rye is one of a number of species that grow wild in central and eastern Turkey and in adjacent areas. Domesticated rye occurs in small quantities at a number of Neolithic sites in Asia Minor (Anatolia, now Turkey), such as the Pre-Pottery Neolithic B Can Hasan III near Çatalhöyük,[2][3] but is otherwise absent from the archaeological record until the Bronze Age of central Europe, c. 1800–1500 BCE.[4] It is possible that rye traveled west from Asia Minor as a minor admixture in wheat (possibly as a result of Vavilovian mimicry), and was only later cultivated in its own right.[5] Archeological evidence of this grain has been found in Roman contexts along the Rhine and the Danube and in Ireland and Britain.[6] Roman naturalist Pliny the Elder was dismissive of a grain that may have been rye, writing that it "is a very poor food and only serves to avert starvation".[7] He said it was mixed with spelt "to mitigate its bitter taste, and even then is most unpleasant to the stomach".[8]

Since the Middle Ages people have cultivated rye widely in Central and Eastern Europe. It serves as the main bread cereal in most areas east of the France–Germany border and north of Hungary. In Southern Europe, it was cultivated on marginal lands.

Claims of much earlier cultivation of rye, at the Epipalaeolithic site of Tell Abu Hureyra in the Euphrates valley of northern Syria[9] remain controversial. Critics point to inconsistencies in the radiocarbon dates, and identifications based solely on grain, rather than on chaff.[10]

Agronomy

Winter rye is any breed of rye planted in the fall to provide ground cover for the winter. It grows during warmer days of the winter when sunlight temporarily warms the plant above freezing, even while there is general snow cover. It can be used to prevent the growth of winter-hardy weeds,[11] and can either be harvested as a bonus crop or tilled directly into the ground in spring to provide more organic matter for the next summer's crop. It is sometimes used in winter gardens and is a common nurse crop.

Rye grows better than any other cereal on heavy clay and light sandy and infertile or drought-affected soils. It can tolerate pH between 4.5 and 8.0, but soils having pH 5.0 to 7.0 are best suited for rye cultivation. Rye grows best on fertile, well-drained loam or clay-loam soils. [12]

The nematode Ditylenchus dipsaci, leaf beetle, fruit fly, gout fly, cereal chafer, dart moth, cereal bug, Hessian fly, and rustic shoulder knot are among insects which can seriously affect rye health.[13]

Production and consumption statistics
Rye exports by country (2014), from Harvard Atlas of Economic Complexity
Rye Production map
Top rye producers2018
(metric ton)[14]		2016
(metric ton)		2012
(metric ton)
 European Union6,263,5277,402,7208,746,414
 Germany2,201,4003,173,8003,893,000
 Poland2,166,8842,199,5782,888,137
 Russia1,916,5062,541,2392,131,519
 China1,044,776525,279678,000
 Belarus502,505650,9341,082,405
 Denmark482,166577,200384,400
 Ukraine393,780391,560676,800
 Spain388,467316,236296,700
 Turkey320,000370,000
 Canada236,400382,000336,600
 United States214,180341,670
World Total12,318,35512,944,09614,615,719

Rye is grown primarily in Eastern, Central and Northern Europe. The main rye belt stretches from northern Germany through Poland, Ukraine, Belarus, Lithuania and Latvia into central and northern Russia. Rye is also grown in North America (Canada and the United States), in South America (Argentina, Brazil and Chile), in Oceania (Australia and New Zealand), in Turkey, in Kazakhstan and in northern China.

Production levels of rye have fallen in most of the producing nations, as of 2012. For instance, production of rye in Russia fell from 13.9 million metric tons (t) in 1992 to 2.1 t in 2012. Corresponding figures for other countries are as follows: Poland – falling from 5.9 t in 1992 to 2.9 t in 2005; Germany – 3.3 t to 3.9 t; Belarus – 3.1 t to 1.1 t; China – 1.7 t to 0.7 t.[15]

World trade of rye is low compared with other grains such as wheat. The total export of rye for 2016 was $186M[16] compared with $30.1B for wheat.[17]

Poland consumes the most rye per person at 32.4 kg/capita (2009). Nordic and Baltic countries are also very high. The EU in general is around 5.6 kg/capita. The entire world only consumes 0.9 kg/capita.[18]

Uses
Sultsina, a traditional Karelian dish made of unleavened rye dough and a farina filling

Rye grain is refined into a flour. Rye flour is high in gliadin but low in glutenin. It therefore has a lower gluten content than wheat flour. It also contains a higher proportion of soluble fiber. Alkylresorcinols are phenolic lipids present in high amounts in the bran layer (e.g. pericarp, testa and aleurone layers) of wheat and rye (0.1–0.3% of dry weight).[19] Rye bread, including pumpernickel, is made using rye flour and is a widely eaten food in Northern and Eastern Europe.[20][21] Rye is also used to make crisp bread.

Rye grain is used to make alcoholic drinks, such as rye whiskey and rye beer. Other uses of rye grain include kvass and an herbal medicine known as rye extract. Rye straw is used as livestock bedding, as a cover crop and green manure for soil amendment, and to make crafts such as corn dollies.

Physical characteristics

Physical properties of rye affect attributes of the final food product such as seed size and surface area, and porosity. The surface area of the seed directly correlates to the drying and heat transfer time.[22] Smaller seeds have increased heat transfer, which leads to lower drying time. Seeds with lower amounts of porosity also have lower tendencies to lose water during the process of drying.[22]

Food
Rye
Nutritional value per 100 g (3.5 oz)
Energy1,414 kJ (338 kcal)
75.86 g
Sugars0.98 g
Dietary fiber15.1 g
1.63 g
10.34 g
VitaminsQuantity %DV†
Thiamine (B1)
26%
0.3 mg
Riboflavin (B2)
25%
0.3 mg
Niacin (B3)
27%
4 mg
Pantothenic acid (B5)
20%
1 mg
Vitamin B6
23%
0.3 mg
Folate (B9)
10%
38 μg
Choline
6%
30 mg
Vitamin E
7%
1 mg
Vitamin K
6%
6 μg
MineralsQuantity %DV†
Calcium
2%
24 mg
Iron
23%
3 mg
Magnesium
31%
110 mg
Manganese
143%
3 mg
Phosphorus
47%
332 mg
Potassium
11%
510 mg
Sodium
0%
2 mg
Zinc
32%
3 mg
Other constituentsQuantity
Water10.6 g
Selenium14 µg
Link to USDA Database Entry
†Percentages are roughly approximated using US recommendations for adults.

Nutrition

A 100-gram (3 1⁄2-ounce) reference serving of rye provides 1,410 kilojoules (338 kilocalories) of food energy and is a rich source (20% or more of the Daily Value, DV) of essential nutrients, including protein, dietary fiber, the B vitamins, niacin (27% DV) and vitamin B6 (23% DV), and several dietary minerals (table). Highest nutrient contents are for manganese (143% DV) and phosphorus (47% DV) (table).

Health effects

According to Health Canada and the US Food and Drug Administration, consuming at least 4 grams per day of rye beta-glucan or 0.65 grams per serving of soluble fiber can lower levels of blood cholesterol, a risk factor for cardiovascular diseases.[23][24]

Eating whole-grain rye, as well as other high-fibre grains, improves regulation of blood sugar (i.e., reduces blood glucose response to a meal).[25] Consuming breakfast cereals containing rye over weeks to months also improved cholesterol levels and glucose regulation.[26]

Health concerns

Like wheat, barley, and their hybrids and derivatives, rye 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, among others.[27] Nevertheless, some wheat allergy patients can tolerate rye or barley.[28]

Ergotism is an illness that can result from eating rye and other grains infected by ergot fungi (which produce ergoline toxins in infected products). Although it is no longer a common illness because of modern food safety efforts, it was common before the 20th century, and it can still happen today if food safety vigilance breaks down.[29]

Cultivation
Some different types of rye grain

Rye grows well in much poorer soils than those necessary for most cereal grains. Thus, it is an especially valuable crop in regions where the soil has sand or peat. Rye plants withstand cold better than other small grains do. Rye will survive with snow cover that would otherwise result in winter-kill for winter wheat. Most farmers grow winter ryes, which are planted and begin to grow in autumn. In spring, the plants develop and produce their crop.[30]

Fall-planted rye shows fast growth. By the summer solstice, plants reach their maximum height of about a 120 cm (4 ft) while spring-planted wheat has only recently germinated. Vigorous growth suppresses even the most noxious weed competitors and rye can be grown without application of herbicides.

Rye is a common, unwanted invader of winter wheat fields. If allowed to grow and mature, it may cause substantially reduced prices (docking) for harvested wheat.[31]

Frost resistance
Rye seed enclosed in its husk

Secale cereale can thrive in subzero environments. The leaves of winter S. cereale produce various antifreeze polypeptides (these are different from the antifreeze polypeptides produced by some fish and insects).[32]

Diseases
Main article: List of rye diseases

Rye is highly susceptible to the ergot fungus.[33][34] Consumption of ergot-infected rye by humans and animals results in a serious medical condition known as ergotism. Ergotism can cause both physical and mental harm, including convulsions, miscarriage, necrosis of digits, hallucinations and death. Historically, damp northern countries that have depended on rye as a staple crop were subject to periodic epidemics of this condition. Such epidemics have been found to correlate with periods of frequent witch trials, such as the Salem witch trials in Massachusetts in 1692.[30] Modern grain-cleaning and milling methods have practically eliminated the disease, but contaminated flour may end up in bread and other food products if the ergot is not removed before milling.[35]

Diversity and uses

Along with Secale cereale's relationship and impact on the environment, it is also a valuable species because of its expansive diversity and uses. In northern Portugal, fourteen different populations of S. cereale were analyzed in order to better understand their differences. It was discovered that the storage proteins are very diverse and possess a lot of overall genetic variation as well, which is useful information to know because scientists can use its diversity in breeding to produce the most efficient cultivar of S. cereale, or rye.[36] Moreover, the beneficial characteristics of S. cereale can also be used to improve certain characteristics of other useful plants, like wheat. The pollination abilities of wheat were vastly improved when there was cross-pollination with S. cereale. The addition of the rye chromosome 4R increased the size of the wheat anther along with increasing the number of pollen grains present.[37]

Wild rye

Along with improved wheat, the optimal characteristics of S. cereale can also be combined with another perennial rye, specifically S. montanum Guss, in order to produce S. cereanum, which has the beneficial characteristics of each. The hybrid rye (S. cereanum) can be grown in all environments, even with less than favorable soil and protects some soils from erosion. In addition, the plant mixture has improved forage and is known to contain digestible fiber and protein.[38] Information about the diversity, the genome[39] and S. cereanum’s ability to cross fertilize with other species is useful information for scientists to know as they attempt to come up with various plant species that will be able to feed humanity in the future without leaving a negative footprint on the environment.

Harvesting

The harvesting of rye is similar to that of wheat. It is usually done with combine harvesters, which cut the plants, thresh and winnow the grain, and release the straw to the field where it is later pressed into bales or left as soil amendment. The resultant grain is stored in local silos or transported to regional grain elevators and combined with other lots for storage and distant shipment. Before the era of mechanised agriculture, rye harvesting was a manual task performed with scythes or sickles.[40][41] The cut rye was often shocked for drying or storage, and the threshing was done by manually beating the seed heads against a floor or other object.

Hybridization
The grain of wheat, rye and triticale — triticale grain is significantly larger than that of wheat.

Rye has long been considered an inferior grain to wheat in quality and digestibility, but has far larger kernels and is more hardy. In the 19th century efforts were made to create a hybrid with the best qualities of both, known initially as triticosecale, but eventually becoming known as triticale. Initially fraught with fertility and germination problems, triticale is becoming more common worldwide in the 21st century, with millions of acres being produced.

References
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Further reading
  • Schlegel, Rolf (2006). "Rye (Secale cereale L.): A Younger Crop Plant with Bright Future". In Sing, R. J.; Jauhar, P. (eds.). Genetic Resources, Chromosome Engineering, and Crop Improvement. Vol. II – Cereals. Boca Raton, Florida: CRC Press. pp. 365–394. ISBN 978-0-8493-1430-8. Schlegel provides a 2011 updated version online.
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