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Sorghum is considered the 'camel of the crops', a true testament to its hardiness and ability to grow in dry, nutrient-poor soils and withstand prolonged droughts. It is especially adapted to grow in dry areas but, being so rich in diversity, it also grows well in temperate and high altitude environments. Sorghum is a staple food for more than 500 million people in more than 30 countries. Preserving the genetic diversity of this crop is integral to safeguarding the food security of the people who depend on it.

Sorghum bicolor (sorghum)

[UPB]

The Useful Plants of Boyacá project

Ecology
Alt. 0 - 2500 m.
Morphology General Habit
Herb.
Distribution
Introduced and naturalised in Colombia.
Conservation
Not Evaluated.

[GB]
Morphology General Habit
Annual. Culms erect; robust; 100-600 cm long; 50-300 mm diam. Culm-nodes glabrous. Leaves cauline. Ligule an eciliate membrane; 1-3 mm long. Leaf-blade base broadly rounded. Leaf-blades 30-100 cm long; 5-10 mm wide.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle with branches tipped by a raceme. Peduncle straight, or deflexed. Panicle open, or contracted; lanceolate, or ovate, or globose; equilateral, or nodding; 4-50 cm long; 2-20 cm wide. Primary panicle branches appressed, or spreading; not whorled; moderately divided. Panicle branches pubescent, or villous. Racemes bearing few fertile spikelets; 1-6 fertile spikelets on each. Rhachis tough; ciliate on margins. Rhachis internodes filiform, or linear; 0.5-5 mm long. Rhachis internode tip transverse. Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform; ciliate.
Morphology Reproductive morphology Inflorescences Spikelets
Companion sterile spikelets well-developed; male; lanceolate; as long as fertile; separately deciduous. Companion sterile spikelet glumes herbaceous; muticous. Companion sterile spikelet lemmas enclosed by glumes. Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate, or obovate, or orbicular; dorsally compressed; 3-10 mm long; persistent on plant. Spikelet callus glabrous, or pilose; base obtuse.
Sterile
Companion sterile spikelets well-developed; male; lanceolate; as long as fertile; separately deciduous. Companion sterile spikelet glumes herbaceous; muticous. Companion sterile spikelet lemmas enclosed by glumes.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate, or obovate, or orbicular; dorsally compressed; 3-10 mm long; persistent on plant. Spikelet callus glabrous, or pilose; base obtuse.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dissimilar; with lower wider than upper; exceeding apex of florets; firmer than fertile lemma; parallel to lemmas, or gaping. Lower glume ovate; 1 length of spikelet; chartaceous, or coriaceous; pallid, or red, or black; 2-keeled; keeled above. Lower glume surface glabrous, or pilose. Lower glume apex obtuse, or acute. Upper glume ovate; chartaceous, or coriaceous; 1-keeled; keeled above; 5-7 -veined. Upper glume surface glabrous, or pubescent. Upper glume margins ciliate. Upper glume apex entire, or dentate; 2 -fid.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; 0.8 length of spikelet; hyaline; 2-5 -veined; ciliolate on margins. Fertile lemma obovate; 1-3 mm long; hyaline; 1-3 -veined. Lemma margins ciliate. Lemma apex entire, or dentate; 2 -fid; muticous, or awned; 1 -awned. Principal lemma awn from a sinus; geniculate; with twisted column. Column of lemma awn pubescent; hairy on the spiral. Palea present.
Morphology Reproductive morphology Flowers
Lodicules 2; ciliate.
Morphology Reproductive morphology Fruits
Caryopsis exposed between gaping lemma and palea at maturity.
Distribution
Europe: central, southwestern, southeastern, and eastern. Africa: north, Macaronesia, west tropical, west-central tropical, northeast tropical, east tropical, southern tropical, south, and western Indian ocean. Asia-temperate: Siberia, Soviet far east, Soviet Middle Asia, Caucasus, western Asia, Arabia, China, Mongolia, and eastern Asia. Asia-tropical: India, Indo-China, Malesia, and Papuasia. Australasia: Australia and New Zealand. Pacific: southwestern, south-central, northwestern, and north-central. North America: northwest USA, north-central USA, northeast USA, southwest USA, south-central USA, southeast USA, and Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, Brazil, and southern South America.
Reference
Andropogoneae. WDC.

[UNAL]

Bernal, R., G. Galeano, A. Rodríguez, H. Sarmiento y M. Gutiérrez. 2017. Nombres Comunes de las Plantas de Colombia. http://www.biovirtual.unal.edu.co/nombrescomunes/

Vernacular
maíz, maíz de Guinea, maíz millo, mijo, sorgo, sorgo forrajero, sudán

[CPLC]

Bernal, R., Gradstein, S.R. & Celis, M. (eds.). 2015. Catálogo de plantas y líquenes de Colombia. Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá. http://catalogoplantasdecolombia.unal.edu.co

Distribution
Naturalizada y adventicia en Colombia; Alt. 0 - 2500 m.; Andes, Llanura del Caribe, Valle del Cauca, Valle del Magdalena.
Morphology General Habit
Hierba
Conservation
No Evaluada

[KSP]

Kew Species Profiles

General Description
.

Sorghum is considered the 'camel of the crops', a true testament to its hardiness and ability to grow in dry, nutrient-poor soils and withstand prolonged droughts. It is especially adapted to grow in dry areas but, being so rich in diversity, it also grows well in temperate and high altitude environments. Sorghum is a staple food for more than 500 million people in more than 30 countries. Preserving the genetic diversity of this crop is integral to safeguarding the food security of the people who depend on it.

Species Profile
Geography and distribution

Sorghum bicolor is widely cultivated in the drier areas of Africa, Asia, Australia, North and South America and Europe. It is also found in tropic, subtropic and warm-temperate regions.

The greatest diversity of cultivated and wild types of sorghum is found in north-eastern Africa where the crop was first cultivated in 5,000 to 3,000 BC.

Although the largest bulk producer today is the USA, about 90% of the area planted to sorghum lies in developing countries, mainly in Africa, and Asia where it is grown by subsistence farmers. 

Description

Overview:  Sorghum bicolor  is an annual with erect, robust stems which can grow up to 600 cm long.

Leaves: The leaf-blade base is broadly rounded and the leaf blades themselves can be up to one metre long.

Flowers: The inflorescence is a panicle (a highly branched inflorescence) 4-50 cm long and 2-20 cm wide. The spikelets (clustered units of flowers and bracts) are in pairs, the fertile spikelets being fixed directly onto the axis and the sterile spikelets on stalks. The sterile spikelets are well developed and as long as the fertile ones. The upper and lower glumes (empty bracts that enclose the florets) are of different sizes, the lower wider than the upper. Both can be of a leathery or papery texture. The flower contains two lodicules (small structures at the base of the stamens) the surface of which is covered in hair-like projections.

Fruits: The fruit is a caryopsis (a fruit in which the seed is fused to an outer wall) which is exposed at maturity.

Uses

Sorghum bicolor is cultivated in many parts of the world today. It is an important food crop in the semi-arid tropics and it is commonly cultivated for feeding livestock in the Americas and Australia.

The grain itself is quite small and is easy to prepare. It can be boiled, roasted or popped (like maize) and when ground into flour it can be used to make porridge, pancakes, dumplings or couscous. Sorghum flour is also used in the production of beers and other non-alcoholic beverages and can be used to make an adhesive in the manufacture of plywood.

Birds also enjoy the taste of sorghum so when bird pressure is high some farmers prefer to grow a variety of sorghum in which the grains are bitter on account of their high tannin content. Both birds and humans find this unprocessed sorghum variety unpalatable although, when cooked or fermented, a delicious dish can be made. In general, white grain is preferred for cooking and the reddish, bird-resistant grain is used for beer making.

In the southern United States, a sweet syrup is made from pressing the stems of sorghum to extract their juice. The sweet sorghum variety is also grown as an energy crop, producing ethanol for use as a biofuel. The roots of sorghum can be used as fuel for cooking.

Beyond the use of the grain as a food source, the entire plant can be used for forage, hay or silage. The stems are used for building, fencing, weaving, broom making and firewood. Industrially, it can be used for vegetable oil, waxes and dyes. The rich violet tones of sorghum dye are used to decorate the masks worn during certain dances by Yoruba people in Southern Benin and in south-western Nigeria.

Sorghum has a number of medicinal applications. In African traditional medicine seed extracts are drunk as a remedy for hepatitis, and decoctions of twigs with lemon against jaundice. Leaves and panicles are included in plant mixtures for decoctions against anaemia. The red pigment of some sorghum varieties is thought to have antimicrobial and antifungal properties and is also used as a cure for anaemia in traditional medicine.

The Salka people in Nigeria use sorghum in arrow poisons. 

Crop wild relatives of sorghum

The most serious pest of sorghum is a parasitic plant,  Striga asiatica . Nicknamed 'the witch weed', this pest can destroy 70-100% of the potential yield of staple crops in the semi-arid tropics. The good news is that varying degrees of resistance to the witch weed have been found in the wild relatives of sorghum and these resistance genes can be passed onto cultivated sorghum.  Strig a-resistant varieties of sorghum have thickened root walls which make it impossible for  Striga  to penetrate - without a host, the witch weed withers and dies. 

The centre of origin of  Sorghum bicolor is Africa, and Ethiopia is reported to contain the highest genetic diversity for this species. Asia is also a hotspot for sorghum diversity due to the early introduction of the crop there. The wild relatives of cultivated sorghum that grow in these centres of diversity are valuable sources of resistance to insect pests, diseases and other stresses such as drought and high temperatures. They can also be exploited to source traits that improve yield and food and fodder quality.

Many of the wild relatives of sorghum are under-represented in genebank collections, because they are rare or located in extremely isolated areas. In addition, many species are under threat due to habitat destruction, commercial agricultural practices and industrial activities.

The Millennium Seed Bank and the Global Crop Diversity Trust are engaged in a ten-year project, called 'Adapting Agriculture to Climate Change'. The project aims to protect, collect and prepare the wild relatives of 29 key food crops, including sorghum, so that they are available to pre-breeders for the development of new varieties that are more resilient to the effects of climate change.

Millennium Seed Bank: Seed storage

The  Millennium Seed Bank Partnership aims to save plants worldwide, focusing on those plants which are under threat and those which are of most use in the future. Once seeds have been collected they are dried, packaged and stored at -20°C in Kew's Millennium Seed Bank vault.

Description of seeds:  Average weight of 1,000 seeds = 14.3 g

Number of seed collections stored in the Millennium Seed Bank:  Two

Seed storage behaviour:  Orthodox (the seeds of this plant can be dried to a low moisture content without significantly reducing their viability which means they are suitable for long-term frozen storage)

Germination testing:  Successful

This species at Kew

The Economic Botany Collection houses a number of sorghum artefacts, among them a Ugandan bowl made from stems of sorghum.

Distribution
Ethiopia, USA
Ecology
Sorghum is adapted to a wide range of ecological conditions. It is mostly cultivated in hot, dry regions, although it can still survive cool weather as well as waterlogged habitats.
Conservation
Widespread in cultivation.

[UPB]
Use Gene Sources
Crop wild relatives which may possess beneficial traits of value in breeding programmes (State of the World's Plants 2016).

[KSP]
Use
Food, livestock feed, hay, silage, building material, firewood, vegetable oil, dyes, medicinal, biofuel.

Native to:

Chad, Ethiopia, Gambia, Mali, Mauritania, Niger, Sudan

Introduced into:

Afghanistan, Alabama, Algeria, Amur, Andaman Is., Angola, Arizona, Arkansas, Aruba, Assam, Austria, Bahamas, Bangladesh, Belgium, Belize, Borneo, Brazil North, Brazil South, Brazil Southeast, Brazil West-Central, Bulgaria, Burkina, Burundi, California, Cambodia, Cameroon, Canary Is., Cape Verde, Cayman Is., Central African Repu, Central European Rus, China North-Central, China South-Central, China Southeast, Christmas I., Cocos (Keeling) Is., Colombia, Colorado, Comoros, Connecticut, Cook Is., Corse, Costa Rica, Cuba, Cyprus, Czechoslovakia, District of Columbia, Djibouti, Dominican Republic, East Aegean Is., East Himalaya, Ecuador, Egypt, El Salvador, Fiji, Florida, France, French Guiana, Georgia, Germany, Great Britain, Guatemala, Guinea, Guinea-Bissau, Gulf States, Guyana, Haiti, Hawaii, Honduras, Hungary, Idaho, Illinois, India, Indiana, Iowa, Iran, Iraq, Italy, Jamaica, Japan, Jawa, Kansas, Kazakhstan, Kentucky, Khabarovsk, Kirgizstan, Korea, Krym, Laos, Lebanon-Syria, Leeward Is., Libya, Louisiana, Madagascar, Madeira, Maine, Malaya, Marianas, Marshall Is., Maryland, Massachusetts, Mauritius, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Mississippi, Missouri, Montana, Morocco, Myanmar, Nansei-shoto, Nebraska, Nepal, Netherlands Antilles, Nevada, New Caledonia, New Hampshire, New Jersey, New Mexico, New York, New Zealand North, New Zealand South, Nicaragua, Niue, North Carolina, North Caucasus, North Dakota, Ohio, Oklahoma, Oman, Ontario, Oregon, Pakistan, Palestine, Panamá, Pennsylvania, Peru, Portugal, Primorye, Puerto Rico, Québec, Rhode I., Rodrigues, Romania, Rwanda, Réunion, Sakhalin, Sardegna, Saudi Arabia, Senegal, Seychelles, Society Is., South Carolina, South Dakota, South European Russi, Spain, Sri Lanka, Suriname, Sweden, Tadzhikistan, Tanzania, Tennessee, Texas, Thailand, Togo, Transcaucasus, Trinidad-Tobago, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Ukraine, Utah, Uzbekistan, Venezuela, Vermont, Vietnam, Virginia, Wake I., Washington, West Himalaya, Windward Is., Wisconsin, Wyoming, Xinjiang, Yemen, Yugoslavia, Zaïre

English
Sorghum

Sorghum bicolor (L.) Moench appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Cope, T.A. [RBG 538], United Kingdom K000914567
Cope, T.A. [RBG 538], United Kingdom K000914566
s.coll. [Cat. no. 8777] Sorghum vulgare K001131619
s.coll. [Cat. no. 8777] Sorghum vulgare K001131609
s.coll. [Cat. no. 8777] Sorghum vulgare K001131611
Wallich, N. [Cat. no. 8777] Sorghum vulgare K001131617
s.coll. [Cat. no. 8777], Bangladesh Sorghum vulgare K001131613
Wallich, N. [Cat. no. 8777], India Sorghum vulgare K001131618
s.coll. [Cat. no. 8777] Sorghum vulgare K001131612
s.coll. [Cat. no. 8777], India Sorghum vulgare K001131615
s.coll. [Cat. no. 8777], India Sorghum vulgare K001131616
s.coll. [Cat. no. 8777], India Sorghum vulgare K001131614
s.coll. [Cat. no. 8777] Sorghum vulgare K001131610

First published in Methodus: 207 (1794)

Accepted by

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Literature

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