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Teff

From Wikipedia, the free encyclopedia

Teff
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Poaceae
Subfamily: Chloridoideae
Genus: Eragrostis
Species:
E. tef
Binomial name
Eragrostis tef
(Zucc.) Trotter
Synonyms

Eragrostis abyssinica (Jacq.) Link

Teff ( Amharic: ጤፍ), also known as Eragrostis tef, Williams lovegrass,[1] or annual bunch grass,[2] is an annual grass, a species of lovegrass native to the Horn of Africa, notably to both Eritrea and Ethiopia.[3] It is cultivated for its edible seeds, also known as teff. Teff was one of the earliest plants domesticated. It is one of the most important staple crops in Ethiopia.

Description

[edit]

Eragrostis tef is a self pollinated tetraploid[4] annual cereal grass.[5] Teff is a C4 plant,[4] which allows it to more efficiently fix carbon in drought and high temperatures, and is an intermediate between a tropical and temperate grass.[6] The name teff is thought to originate from the Amharic word ጠፍፋ teffa, which means "lost".[5][7] This probably refers to its tiny seeds, which have a diameter smaller than 1 mm (0.039 in).[7] Teff is a fine-stemmed, tufted grass with large crowns and many tillers. Its roots are shallow, but develop a massive fibrous rooting system.[7] The plant height varies depending on the cultivation variety and the environmental conditions.[6] As with many ancient crops, teff is quite adaptive and can grow in various environmental conditions;[6] particularly, teff can be cultivated in dry environments, but also under wet conditions on marginal soils.[7]

Teff originated in the Horn of Africa, corresponding to what is today modern day Ethiopia and Eritrea, where it is one of the most important cereals.[8] It is grown for its edible seeds and also for its straw to feed the cattle.[7] The seeds are very small, about a millimeter in length, and a thousand grains weigh approximately 0.3 g (0.011 oz).[9] They can have a color from a white to a deep reddish brown.[6] Teff is similar to millet and quinoa in cooking, but the seed is much smaller and cooks faster, thus using less fuel.[10]

Distribution

[edit]

Teff is mainly cultivated in Ethiopia and Eritrea, where it originates.[8] It is one of the most important staple crops in these two countries, where it is used to make injera or Tayta. In 2016, Ethiopia grew more than 90 percent of the world's teff.[11] It is now also marginally cultivated in India, Australia, Germany, the Netherlands, Spain, and the US, particularly in Idaho, California, Texas, and Nevada.[12][11][10] Because of its very small seeds, a handful is enough to sow a large area. This property makes teff particularly suited to a seminomadic lifestyle.[8]

History

[edit]

Teff was one of the earliest plants domesticated.[13] Teff is believed to have originated in Ethiopia between 4000 BC and 1000 BC. Genetic evidence points to E. pilosa as the most likely wild ancestor.[14] A 19th-century identification of teff seeds from an ancient Egyptian site is now considered doubtful; the seeds in question (no longer available for study) are more likely of E. aegyptiaca, a common wild grass in Egypt.[15]

An Eritrean woman harvesting Teff in Geshinashim, Eritrea.

Teff is the most important commodity produced and consumed in Ethiopia where the flat pancake-like injera provides a livelihood for around 6.5 million small farmers in the country.[16] In 2006, the Ethiopian government outlawed the export of raw teff, fearing export-driven domestic shortages like those suffered by South American countries after the explosion of quinoa consumption in Europe and the US.[16][17] Processed teff, namely injera, could still be exported and was mainly bought by the Ethiopian and Eritrean diaspora living in northern Europe, the Middle East and North America.[16] After a few years, fears of a domestic shortage of teff in the scenario of an international market opening decreased.[17] Teff yields had been increasing by 40 to 50% over the five previous years while prices had remained stable in Ethiopia.[16][17] This led the government to partially lift the export ban in 2015. To ensure that the domestic production would not be minimized, the export licenses have only been granted to 48 commercial farmers which had not cultivated the plant before.[17] Lack of mechanization is a barrier to potential increases in teff exports.[17] Yet the increasing demand, rising by 7–10% per year, and the subsequent increase in exports is encouraging the country to speed up the modernization of agriculture and is also boosting research.[17] Because of its potential as an economic success, a few other countries, including the US and some European countries, are already cultivating teff and selling it on domestic markets.[17]

Uses

[edit]
Injera served in a typical Ethiopian dish
Teff (small grains) and sorghum (large grains), ingredients for tella

Teff is a multipurpose crop which has a high importance for the Ethiopian diet and culture.[6][8] In Ethiopia, teff provides two-thirds of the daily protein intake.[18] It is not only important for human nutrition, but also as fodder for livestock, or as building material.[6][18] Teff is the main ingredient to prepare injera, a sourdough-risen flatbread.[19] During meals, it is often eaten with meat or ground pulses.[6] Sometimes it is also eaten as porridge.[6] Moreover, teff can be used to prepare alcoholic drinks, called arak'e or katikalla[6] or beer, called t'ella or fersso.[18] Finally, due to its high mineral content, teff is also mixed with soybeans, chickpeas or other grains to manufacture baby foods.[6]

According to a study in Ethiopia, farmers indicated a preference among consumers for white teff over darker colored varieties.[20] As a nutritious fodder, teff is used to feed ruminants in Ethiopia and horses in the United States.[21] It is a source of animal feed, especially during the dry season, and it is often preferred over straw from other cereals.[6][18] Teff grass can be used as a construction material when mixed with mud to plaster the walls of local grain storage facilities.[6][18]

Ecology

[edit]

Teff is adaptable and it can grow in various environments, at altitudes ranging from sea level to 3,200 metres (10,500 ft).[22] However, it does not tolerate frost. Highest yields are obtained when teff is grown between 1,800 to 2,100 m (5,900 to 6,900 ft), with an annual rainfall of 450 to 550 mm (18 to 22 in), and daily temperatures range from 15 to 27 °C (59 to 81 °F). Yields decrease when annual rainfall falls below 250 mm and when the average temperature during pollination exceeds 22 °C.[23] Despite its superficial root system, teff is quite drought-resistant thanks to its ability to regenerate rapidly after a moderate water stress and to produce fruits in a short time span. It is daylight-sensitive and flowers best with 12 hours of daylight. Teff is usually cultivated on pH neutral soils, but it was noticed that it could sustain acidity up to a pH below 5. Teff has a C4 photosynthesis mechanism.[24]

Cultivation

[edit]
Traditional teff harvesting in Ethiopia, October 2007

The cultivation of teff is labor-intensive and the small size of its seeds makes it difficult to handle and transport without loss.[7] In Ethiopia, teff is mostly produced during the main rain season, between July and November. It is known as an "emergency crop" because it is planted late in the season, when the temperatures are warmer, and most other crops have already been planted.[24] Teff germination generally occurs 3–12 days after sowing. Optimal germination temperatures range from 15 to 35 °C; below 10 °C, germination almost does not occur.[24] Teff is traditionally sown or broadcast by hand, on firm, humid soil.[25] Usual sowing density ranges from 15 to 20 kg/ha, though farmers can sow up to 50 kg/ha, because the seeds are hard to spread equally and a higher sowing density helps to reduce weed competition at the early stage.[24] Seeds are either left at the soil surface or slightly covered by a thin layer of soil, but must not be planted at a depth greater than 1 cm. The field can be subsequently rolled.[26] Sowing can also be done mechanically; row planting reduces lodging.[citation needed]

Field of teff

Recommended fertilization doses are 25–60 kg/ha for N, and 10–18 kg/ha for P. Teff responds more to nitrogen than to phosphorus; thus, high nitrogen inputs increase the biomass production and size of the plants, thereby increasing lodging.[27] To avoid this, farmers can decrease nitrogen input, cultivate teff after a legume crop or adjust sowing time so that the rains have stopped when the crop reaches heading stage. In Ethiopia, teff is commonly used in crop rotations with other cereals and legumes.[26]

Teff threshed by using animals walking on the harvest

Teff is harvested 2–6 months after sowing, when the vegetative parts start to turn yellow. If teff is harvested past its maturation, seeds will fall off, especially in windy or rainy weather conditions.[24] In Ethiopia, harvest lasts from November to January; harvest is usually done manually, with sickles. Farmers cut the plants at the soil surface, pile them up in the field and transport them to the threshing area.[28] Teff is traditionally threshed by using animals walking on the harvest. Alternatively, some farmers rent threshing machines used for other cereals.[25] The seeds are easy to store, as they are resistant to most pests during storage. Teff seeds can stay viable several years if direct contact with humidity and sun is avoided.[6] Average yields in Ethiopia reach around two tonnes per ha. One single inflorescence can produce up to 1000 seeds, and one plant up to 10,000.[29] Moreover, teff offers some promising opportunities for breeding programs: the first draft of the Eragrostis tef genome was published in 2014 and research institutes have started selecting for more resistant varieties.[30] In 1996, the US National Research Council characterized teff as having the "potential to improve nutrition, boost food security, foster rural development and support sustainable landcare."[8]

Challenges and prospects

[edit]

The major challenges in teff production are its low yield and high susceptibility to lodging. Efforts to conventionally breed teff towards higher yields started in the 1950s and led to an average annual increase in yield of 0.8%.[31] However, no considerable improvements concerning the susceptibility of lodging have been made, due mainly to low demand outside of Ethiopia and Eritrea.[citation needed]

High-yielding varieties, such as Quencho, were widely adopted by farmers in Ethiopia.[31] Sequencing of the teff genome improved breeding,[32] and an ethyl methanesulphonate (EMS)-mutagenized population was then used to breed the first semi-dwarf lodging-tolerant teff line, called kegne.[33] In 2015, researchers tested 28 new teff varieties and identified three promising lines that generated yields of up to 4.7 tonnes per ha.[34]

The "Teff Improvement Project" marked a milestone by releasing the first teff variety Tesfa to the Ethiopian markets in March 2017.[35] Areas of further development include: "(i) improving productivity of teff; (ii) overcoming the lodging malady; (iii) developing climate-smart and appropriate crop and soil management options; (iv) developing tolerance to abiotic stresses such as drought and soil acidity; (v) developing suitable pre- and post-harvest mechanization technologies suitable for smallholder farmers as well as commercial farms; (vi) food processing and nutrition aspects with special attention to the development of different food recipes and value-added products; (vii) developing crop protection measures against diseases, insect pests and weeds; and (viii) improving or strengthening socio-economics and agricultural extension services."[36]

Pests

[edit]

The tef shoot fly (Atherigona hyalinipennis) is a major pest of the crop.[37][38][39]

Other insect pests include:[40]

Nutritional value

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Teff, cooked
Nutritional value per 100 g (3.5 oz)
Energy422 kJ (101 kcal)
19.86 g
Dietary fiber2.8 g
0.65 g
3.87 g
Vitamins and minerals
VitaminsQuantity
%DV†
Thiamine (B1)
15%
0.183 mg
Riboflavin (B2)
3%
0.033 mg
Niacin (B3)
6%
0.909 mg
Vitamin B6
6%
0.097 mg
Folate (B9)
5%
18 μg
MineralsQuantity
%DV†
Calcium
4%
49 mg
Iron
11%
2.05 mg
Magnesium
12%
50 mg
Manganese
124%
2.86 mg
Phosphorus
10%
120 mg
Potassium
4%
107 mg
Sodium
0%
8 mg
Zinc
10%
1.11 mg
Other constituentsQuantity
Water74.93 g
Link to USDA Database Entry
†Percentages estimated using US recommendations for adults,[41] except for potassium, which is estimated based on expert recommendation from the National Academies.[42]

Uncooked teff is 9% water, 73% carbohydrates, 13% protein, and 2% fat. Cooked teff is 75% water, 20% carbohydrates, 4% protein, and less than 1% fat (table). A 100-gram (3+1⁄2-ounce) reference serving of cooked teff provides 420 kilojoules (101 kilocalories) of food energy, is a rich source of protein, dietary fiber, and manganese, and contains moderate amounts of thiamin, phosphorus, iron, magnesium, and zinc (table). The fiber content in teff is also higher than in most other cereals.[43]

Teff is gluten free, and a method has been developed to process teff into a flour with a wider range of baking applications, such as for bread and pasta.[44]

Teff, uncooked
Nutritional value per 100 g (3.5 oz)
Energy1,536 kJ (367 kcal)
73.13 g
Dietary fiber8.0 g
2.38 g
13.30 g
Vitamins and minerals
VitaminsQuantity
%DV†
Thiamine (B1)
33%
0.390 mg
Riboflavin (B2)
21%
0.270 mg
Niacin (B3)
21%
03.363 mg
Vitamin B6
28%
0.482 mg
MineralsQuantity
%DV†
Calcium
14%
180 mg
Iron
42%
7.63 mg
Magnesium
44%
184 mg
Phosphorus
34%
429 mg
Potassium
14%
427 mg
Sodium
1%
12 mg
Zinc
33%
3.63 mg
Other constituentsQuantity
Water8.82g
Link to USDA Database Entry
†Percentages estimated using US recommendations for adults,[41] except for potassium, which is estimated based on expert recommendation from the National Academies.[42]
Amino-acid Concentration in raw teff, in g/16gN[44]
Lysine 3.68
Isoleucine 4.07
Leucine 8.53
Valine 5.46
Phenylalaline 5.69
Tyrosine 3.84
Tryptophan 1.30
Threonine 4.32
Histidine 3.21
Arginine 5.15
Methionine 4.06
Cystine 2.50
Asparagine + Aspartic Acid 6.4
Proline 8.2
Serine 4.1
Glutamine + Glutamic Acid 21.8
Glycine 3.1
Alanine 10.1

Patent and bio-piracy

[edit]

In 2003, a Dutch company, Health and Performance Food International (HPFI), paired with the Ethiopian Institute of Biodiversity Conservation to introduce teff to European markets.[45] The original agreement was for Ethiopia to provide HPFI with a dozen strains of teff to market globally, and the two entities would split the proceeds.

HPFI's CEO, Jans Roosjen, had taken out two patents on teff in 2003 and 2007, claiming that his way of milling and storing the flour was unique. HPFI went bankrupt in 2009, allowing Roosjen to continue to utilize those patents and the marketing rights for the grain while being freed from the original agreement with Ethiopia.[45] Ethiopia only received 4,000 euros over five years of collaboration.[46]

Roosjen ended up suing a Dutch bakery company, Bakers, for patent infringement because they were selling teff baked goods. The Dutch patent office declared that the patent was void, citing that the methods used to bake and mix flours were "general professional knowledge".[46] The deadline for Roosjen to appeal the decision expired in 2019, officially allowing Ethiopia access to Dutch teff markets.

However, Roosjen's company Ancientgrains BV still maintains patent rights in Belgium, Germany, Britain, Austria and Italy.

Teff is inherent to Ethiopia's national culture and identity,[47] and the government of Ethiopia has expressed intent to hold Roosjen accountable to the fullest extent of international patent law, as well as to regain ownership over international markets of its most important food.[48]

See also

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References

[edit]
  1. ^ Bell, Randy A. (17 August 2015). "Teff is a healthy wheat alternative". Michigan State University. Archived from the original on 2019-01-15. Retrieved 2019-01-15. It is known by other names, such as Eragrostis tef, Williams lovegrass, annual bunch grass and taf.
  2. ^ Stallknecht, Gilbert F. (24 February 1998). "New Crop FactSHEET: Teff". NewCROP, the New Crop Resource Online Program. Purdue University. Retrieved 2019-10-20. English: Teff, Lovegrass, Annual Bunch Grass, Warm Season Annual Bunch Grass
  3. ^ Aptekar, Lewis (2013). In the Lion's Mouth: Hope and Heartbreak in Humanitarian Assistance (2nd ed.). XLibris LLC. p. 9. ISBN 978-1-4836-9519-8. OCLC 922837922.
  4. ^ a b Bultosa, G. (2016). "Teff: Overview". In Wrigley, Colin W.; Corke, Harold; Seetharaman, Koushik; Faubion, Jonathan (eds.). Encyclopedia of Food Grains (2nd ed.). Kidlington, Oxford, UK: Academic Press. pp. 209 ff. ISBN 9780123947864. OCLC 939553708. Teff is a C4 self-pollinated tetraploid cereal plant with a chromosome number of 2n=4x=20.
  5. ^ a b Stallknecht, G.F.; Gilbertson, Kenneth M.; Eckhoff, J.L. (1993). Janick, J.; Simon, J.E. (eds.). "Teff: Food Crop for Humans and Animals". New Crops. Wiley: 231–234.
  6. ^ a b c d e f g h i j k l m Ketema, Seyfu (1997). Tef, Eragrostis tef (Zucc.) Trotter (PDF). Promoting the conservation and use of underutilized and neglected crops. Vol. 12. Institute of Plant Genetics and Crop Plant Research (IPGRI). Rome: Bioversity International. ISBN 9290433043. OCLC 37605548. Archived (PDF) from the original on 2018-07-17.
  7. ^ a b c d e f "Teff, Grain". Encyclopædia Britannica. 2016. Retrieved 14 November 2018.
  8. ^ a b c d e National Research Council (14 February 1996). "Tef". Lost Crops of Africa: Volume I: Grains. Vol. 1. National Academies Press. p. 222. doi:10.17226/2305. ISBN 978-0-309-04990-0. Retrieved 18 July 2008.
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  10. ^ a b Gonzales, Sasha (8 June 2015). "Teff the new superfood grain - just don't call it the new quinoa". South China Morning Post. Archived from the original on 2018-04-08. Retrieved 2018-04-08. Today, the resilient crop is also grown in countries such as the US, Spain, Germany and Australia; It also cooks quickly, so requires less fuel to prepare.
  11. ^ a b O'Connor, Anahad (16 August 2016). "Is Teff the New Super Grain?". New York Times. Archived from the original on 2019-10-05. Retrieved 2019-10-20. But most of the teff consumed in North America, Europe and other parts of the world is grown in places like Idaho, the Netherlands, Australia and India; More than 90 percent of the world's teff is grown in Ethiopia.
  12. ^ Wax, Emily (29 July 2012). "As Americans embrace Ethiopian cuisine, its farmers grow more teff". The Washington Post. Archived from the original on 2019-05-08. Retrieved 8 May 2019. Teff […] is also being grown in Nevada, California and Texas, Miller says; Wayne Carlson, who operates the Teff Company in Idaho's Snake River Valley, is considered the father of American teff.
  13. ^ Murphy, Denis J. (2007). People, Plants, and Genes: The Story of Crops and Humanity. Oxford: Oxford University Press. ISBN 9780199207145.
  14. ^ Ingram, Amanda L.; Doyle, Jeff J. (2003). "The origin and evolution of Eragrostis tef (Poaceae) and related polyploids: Evidence from nuclear waxy and plastid rps16". American Journal of Botany. 90 (1): 116–122. doi:10.3732/ajb.90.1.116. JSTOR 4122731. PMID 21659086.
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  25. ^ a b Mottaleb, K.A. & Rahut, D.B. (2018). Household production and consumption patterns of Teff in Ethiopia. Agribusiness, 34, 668–684.
  26. ^ a b Brink, M. (Martin), Belay, G. & Plant Resources of Tropical Africa (Program). (2006). Cereals and pulses. PROTA Foundation.
  27. ^ Van Delden, S.H., Vos, J., Ennos, A.R. & Stomph, T.J. (2010). Analysing lodging of the panicle bearing cereal teff (Eragrostis tef). New Phytol., 186, 696–707.
  28. ^ Tefera, H.; Belay, G., 2006. Eragrostis tef (Zuccagni) Trotter. In: Brink, M.; Belay, G. (eds), PROTA (Plant Resources of Tropical Africa/Ressources végétales de l'Afrique tropicale), Wageningen, Netherlands
  29. ^ Gebre, E., Gugsa, L., Schlüter, U. & Kunert, K. (2013). Transformation of tef (Eragrostis tef) by Agrobacterium through immature embryo regeneration system for inducing semi-dwarfism. South African J. Bot., 87, 9–17.
  30. ^ Cannarozzi, G.; et al. (2014). "Genome and transcriptome sequencing identifies breeding targets in the orphan crop tef (Eragrostis tef)". BMC Genomics. 15 (1): 581. doi:10.1186/1471-2164-15-581. PMC 4119204. PMID 25007843.
  31. ^ a b Assefa, K.; Yu, J.-K.; Zeid, M.; Belay, G.; Tefera, H.; Sorrells, M. E. (2011). "Breeding tef [Eragrostis tef (Zucc.) trotter]: conventional and molecular approaches". Plant Breeding. 130 (1): 1–9. doi:10.1111/j.1439-0523.2010.01782.x. ISSN 1439-0523.
  32. ^ Cannarozzi, Gina; Plaza-Wüthrich, Sonia; Esfeld, Korinna; Larti, Stéphanie; Wilson, Yi Song; Girma, Dejene; de Castro, Edouard; Chanyalew, Solomon; Blösch, Regula; Farinelli, Laurent; Lyons, Eric (2014-07-09). "Genome and transcriptome sequencing identifies breeding targets in the orphan crop tef (Eragrostis tef)". BMC Genomics. 15 (1): 581. doi:10.1186/1471-2164-15-581. ISSN 1471-2164. PMC 4119204. PMID 25007843.
  33. ^ Jöst, Moritz; Esfeld, Korinna; Burian, Agata; Cannarozzi, Gina; Chanyalew, Solomon; Kuhlemeier, Cris; Assefa, Kebebew; Tadele, Zerihun (2015-02-01). "Semi-dwarfism and lodging tolerance in tef (Eragrostis tef) is linked to a mutation in the α-Tubulin 1 gene". Journal of Experimental Botany. 66 (3): 933–944. doi:10.1093/jxb/eru452. ISSN 0022-0957. PMC 4321551. PMID 25399019.
  34. ^ Jifar, H.; Tesfaye, K.; Tesfaye, K.; Assefa, K.; Chanyalew, S.; Tadele, Z. (2017-01-01). "Semi-dwarf tef lines for high seed yield and lodging tolerance in Central Ethiopia". African Crop Science Journal. 25 (4): 419–439–439. doi:10.4314/acsj.v25i4.3. ISSN 2072-6589.
  35. ^ Cannarozzi, Gina; Chanyalew, Solomon; Assefa, Kebebew; Bekele, Abate; Blösch, Regula; Weichert, Annett; Klauser, Dominik; Plaza-Wüthrich, Sonia; Esfeld, Korinna; Jöst, Moritz; Rindisbacher, Abiel (2018-01-23). "Technology generation to dissemination: lessons learned from the tef improvement project". Euphytica. 214 (2): 31. doi:10.1007/s10681-018-2115-5. hdl:20.500.11850/242165. ISSN 1573-5060.
  36. ^ Chanyalew, Solomon; Ferede, Setotaw; Damte, Tebkew; Fikre, Tsion; Genet, Yazachew; Kebede, Worku; Tolossa, Kidist; Tadele, Zerihun; Assefa, Kebebew (2019-09-01). "Significance and prospects of an orphan crop tef". Planta. 250 (3): 753–767. doi:10.1007/s00425-019-03209-z. ISSN 1432-2048. PMID 31222492.
  37. ^ Ruparao T. Gahukar, Gadi V. P. Reddy. Management of Economically Important Insect Pests of Millet. Journal of Integrated Pest Management (2019) 10(1): 28; 1–10 https://doi.org/10.1093/jipm/pmz026
  38. ^ Mideksa, A., M. Negeri, and T. Shiberu. 2014. Management of tef shoot fly, Atherigona hyalinipennis (Reg.) (Diptera: Muscidae) on tef at Ambo, West Showa of Ethiopia. J. Entomol. Nematol. 6: 134–139.
  39. ^ Nigus, C., and T. Damte. 2018. Identification of the tef shoot fly species from tef, Eragrostis tef (Zucc.), Trotter growing areas of Ethiopia. Afr. J. Insects 5: 181–184.
  40. ^ Kalaisekar, A (2017). Insect pests of millets: systematics, bionomics, and management. London: Elsevier. ISBN 978-0-12-804243-4. OCLC 967265246.
  41. ^ a b United States Food and Drug Administration (2024). "Daily Value on the Nutrition and Supplement Facts Labels". FDA. Archived from the original on 2024-03-27. Retrieved 2024-03-28.
  42. ^ a b National Academies of Sciences, Engineering, and Medicine; Health and Medicine Division; Food and Nutrition Board; Committee to Review the Dietary Reference Intakes for Sodium and Potassium (2019). Oria, Maria; Harrison, Meghan; Stallings, Virginia A. (eds.). Dietary Reference Intakes for Sodium and Potassium. The National Academies Collection: Reports funded by National Institutes of Health. Washington, DC: National Academies Press (US). ISBN 978-0-309-48834-1. PMID 30844154. Archived from the original on 2024-05-09. Retrieved 2024-06-21.[page needed]
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  48. ^ Tilahun, Dagim (6 February 2019). "The Patenting of Ethiopia's Teff by a European Company, and the Country's Recourse". Medium. Retrieved 12 April 2020.
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