Parkia biglobosa

Not to be confused with Locust bean.

Parkia biglobosa
Inflorescences
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Caesalpinioideae
Clade: Mimosoid clade
Genus: Parkia
Species:
P. biglobosa
Binomial name
Parkia biglobosa
Synonyms[2]
List
    • Inga biglobosa (Jacq.) Willd.
    • Inga faeculifera Ham.
    • Inga faroba Mérat & Lens
    • Inga senegalensis DC.
    • Mimosa biglobosa Jacq.
    • Mimosa taxifolia Pers.
    • Parkia africana R.Br.
    • Parkia clappertoniana Keay
    • Parkia intermedia Oliv.
    • Parkia oliveri J.F.Macbr.
    • Parkia uniglobosa G.Don
    • Prosopis faeculifera Desv.

Parkia biglobosa, the African locust bean,[3] is a perennial deciduous tree in the family Fabaceae. It is found in a wide range of environments in Africa and is primarily grown for its pods that contain both a sweet pulp and valuable seeds. Where the tree is grown, the crushing and fermenting of these seeds constitutes an important economic activity. Various parts of the locust bean tree are used for medicinal and food purposes. As a standing tree, locust bean may have a positive effect on the yield of nearby crops, like other leguminous plants.

Description

Parkia biglobosa is a dicotyledonous angiosperm belonging to the family Fabaceae (Caesalpinioideae - Mimosoid clade).[4] It is a deciduous perennial that grows to between 7 and 20 metres high,[5] in some cases up to 30 metres.[6] The tree is a fire-resistant heliophyte characterized by a thick dark gray-brown bark.[5] The pods of the tree, commonly referred to as locust beans, are pink in the beginning and turn dark brown when fully mature. They are 30-40 centimetres long on average, with some reaching lengths of about 45 centimetres. Each pod can contain up to 30 seeds;[5] the seeds are embedded in a sweet, powdery yellow pulp.

History, geography and ethnography

In West Africa, the bark, roots, leaves, flowers, fruits, and seeds are commonly used in traditional medicine to treat a wide diversity of complaints, both internally and externally, sometimes in combination with other medicinal plants. The bark is most important for medicinal uses, followed by the leaves. Medicinal applications include the treatment of parasitic infections, circulatory system disorders, such as arterial hypertension, and disorders of the respiratory system, digestive system and skin. In veterinary medicine, a root decoction is used to treat coccidiosis in poultry. Green pods are crushed and added to rivers to kill fish.

The tree locust bean is also known as "arbre à farine, fern leaf, irú, monkey cutlass tree, two ball nitta-tree, nété and néré"). The use of fermented locust beans in West Africa was documented as early as the 14th century,[7] and described by Michel Adanson in his Histoire naturelle du Sénégal, published in 1757.[8]

Geographically, Parkia biglobosa can be found in a belt stretching from the Atlantic coast in Senegal to southern Sudan and northern Uganda.[9] The tree currently exists within a wide range of natural communities but is most abundant in anthropic communities – places where cultivation is semi-permanent.[5]

Annual production of seeds in northern Nigeria is estimated at around 200,000 t.[9] While the products of the tree are not common in international trade, they form an important part of local and regional trade in West Africa.[9] The seeds are especially prized, and much trade occurs locally in the Sahel region where they are transferred between borders.[9]

Growing conditions

Seed germination

There are two types of seed within each pod – reddish-dark and dark (black). The ratio between these seeds varies from 1:20 to 1:5, with darker seeds outnumbering lighter seeds. Reddish-dark seeds have a thinner coat and they germinate earlier than black seeds that have not first been acid treated. “Dark seeds have a harder seed coat and require various pretreatments to ensure good germination rates.”[5]

Although the seeds’ usual germination rate has been reported at 75%, germination can be improved by scalding for about 7 minutes, then soaking seeds in hot water overnight prior to planting.[5] Locust tree seedlings “can be established vegetatively in nursery beds by grafting or budding, or by rooting adult cuttings.”[5] These methods have shown good results in 11- to 25-year-old trees in Burkina Faso and Nigeria.[9]

Agronomy study

After the initial sowing into seed beds, seedlings at 3 days old can be transplanted into pots.[9] Seedlings typically reach 20-25 centimetres tall after 20 weeks in the nursery, at which point they can be planted out into the field; direct sowing is possible, but its viability largely depends on soil moisture and the degree of insect/rodent threats.[9] Preliminary ploughing “contributes to proper establishment of seedlings in the field with a success rate of 82% four years” in some cases after planting. Seeds can be treated with concentrated sulphuric acid “in a concentration of 97% for 10 minutes and then immersed in water for 24 hours to break their dormancy period.”[10]

Seedlings grow comparatively fast – they can reach a height of 1 metre in just 1 year.[9] They will begin to flower at 5–7 years during the dry season in the Sahel (December to April), while occurring slightly earlier in less dry regions.[9] The tree is pollinated primarily by bats, but can also occur by way of “honeybees, flies, wasps, ants, tenebrionid beetles and tettigometid bugs.”[5] Fruiting can occur at anywhere from 5–10 years, and they will start to ripen just before the first rains and continue over most of the season.[5]

Foliage of locust bean has been found to contribute to soil fertility improvement. In one experiment, the isolated relative effect of locust bean in the third year of the experiment was 86%, compared to 138% for neem, a related tree.[11] The relative index of soil productivity during this time clearly appreciated for locust bean, as well as the accumulation of P and organic C compared with neem.[11]

Shade tolerance of other crops planted the near locust bean tree may present additional problems. In a 2-year experiment on shading, Parkia biglobosa was “found to have suppressive effects on vegetative growth and yield of pearl millet in both years.”[12] Eggplant yields were also suppressed by trees to between one third and one tenth of the yield in controlled plots, which themselves were damaged by rain.[12] Despite this, chilli pepper yields (which were also affected by rain in the controlled plots) increased by up to 150% under the canopy of the locust bean tree.[12]

Biophysical limitations

The tree of the African locust bean requires “between 0-300 metres of altitude, a mean annual rainfall of between 400-700 millimetres and a mean annual temperature of about 24-28°C.”[5] It prefers well-drained, thick clay soils but can also be found on shallow, thin sandy soils.[5]

Uses

Food

Balls of sumbala (also called daddawaor dawadawa) and the African locust bean seeds they are prepared from.

The yellow pulp, which contains the seeds, is naturally sweet “and is processed into a valuable carbohydrate food. The seeds are processed into a seasoning, known as daddawa among Hausa and Northern tribes of Ghana. It is known as sikomu among the Igbo people, nune among the Tiv people and irú amongst the Yoruba people of Nigeria.”[13] The pulp is also used to make beverages.[14]

The seeds of the locust bean are the most valuable part of the plant. They are high in lipids (29%), protein (35%), carbohydrates (16%), and are a good source of fat and calcium for rural dwellers.[6] The seed is first cooked to remove the seed coat and then fermented to produce the desired result. Seeds can then be pounded into powder, then formed into cakes. In a study conducted on the fermentation of dawadawa, it was found that Gmelina arborea and banana leaves accelerated fermentation of seeds, while increasing fat, protein and moisture content, but also decreasing carbohydrate content.[15]

Animal feed

The fruit pulp, the leaves and the seeds are also used to feed livestock and poultry. The flowers are attractive to bees and a good source of nectar.[16]

Economic activity

The cultivation of this tree is an important economic activity for many in Africa, including many women. Néré fruits are highly commercialized in Burkina Faso; "over 50% of respondents in a nation-wide survey said they participated in its trade."[17] In general, women are wholly responsible for the sale of fermented seeds (dawadawa) even though men and women are equally responsible for the sale of dry seeds.[17]

Medical

Indigenous healers in Africa use different parts of the locust bean tree for health benefits. In a survey conducted on healers in Togo, Parkia biglobosa was one of the highest cited plants used for treating hypertension.[18] The tree was also one of two plants “listed as having real wound-healing properties in South-Western Nigeria, influencing the proliferation of dermal fibroblasts significantly.”[19] In a similar survey conducted in Guinea relating to their use of antimalarial plants, Parkia biglobosa was cited among those most often successfully used.[20] In an analysis on the antibacterial properties of the plant, another study found that “these properties compare favourably with those of streptomycin, making it a potential source of compounds used in the management of bacterial infections.”[21]

References

  1. ^ Botanic Gardens Conservation International (BGCI) & IUCN SSC Global Tree Specialist Group (2019). "Parkia biglobosa". IUCN Red List of Threatened Species. 2019: e.T144263048A149029456. Retrieved 11 July 2022.
  2. ^ "Parkia biglobosa (Jacq.) R.Br. ex G.Don". Plants of the World Online. Board of Trustees of the Royal Botanic Gardens, Kew. 2017. Retrieved 12 November 2020.
  3. ^ "Parkia biglobosa". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved 11 July 2022.
  4. ^ Thiombiano, D. N., Lamien, N., Dibong, D. S., Boussim, I. J., & Belem, B. (2012). The role of woody species in managing food shortage in Burkina Faso. Sécheresse, 23(2), 86-93. Retrieved November 13, 2013, from the Web of Knowledge
  5. ^ a b c d e f g h i j k "Species Information – Parkia biglobosa. (n.d.). Agroforestry Tree Database. Retrieved November 13, 2013, from worldagroforestrycentre.org". Archived from the original on December 18, 2013. Retrieved December 6, 2013.
  6. ^ a b Ntui, V. O., Uyoh, E. A., Urua, I. S., Ogbu, U., & Okpako, E. C. (2012). Regeneration of Parkia biglobosa Benth.: An important tree species of Africa. Journal of Microbiology and Biotechnology Research, 2(1), 169-177. Retrieved November 12, 2013, from the Scholar's Research Library database.
  7. ^ "Parkia biglobosa".
  8. ^ Janick, J. (2008). Parkia biglobosa African Locust Bean. The encyclopedia of fruit & nuts (pp. 395-400). Wallingford, U.K.: CABI North American Office.
  9. ^ a b c d e f g h i "Parkia biglobosa. (n.d.). Protabase. Retrieved November 12, 2013, from database.prota.org". Archived from the original on December 12, 2013. Retrieved December 6, 2013.
  10. ^ "Parkia biglobosa. (n.d.). Protabase. Retrieved November 12, 2013, from". Archived from the original on December 12, 2013. Retrieved December 6, 2013.
  11. ^ a b Uyovbisere, E. O., & Elemo, K. A. (2002). Effect of tree foliage of locust bean (Parkia biglobosa) and neem (Azadirachta indica) on soil fertility and productivity of maize in a savanna alfisol.. Nutrient Cycling in Agroecosystems, 62(2), 115-122. Retrieved November 13, 2013, from the Agricola database.
  12. ^ a b c Pouliot, M., Bayala, J., & Raebild, A. (2012). Testing the shade tolerance of selected crops under Parkia biglobosa (Jacq.) Benth. in an agroforestry parkland in Burkina Faso, West Africa. Agroforestry Systems, 85(3), 477-488. Retrieved November 13, 2013, from the Web of Knowledge database
  13. ^ Olaniyan, A. (n.d.). Locust Bean Products. Non-Wood News-No.10. Retrieved November 12, 2013, from fao.org
  14. ^ Pieroni, Andrea (2005). Prance, Ghillean; Nesbitt, Mark (eds.). The Cultural History of Plants. Routledge. p. 30. ISBN 0415927463.
  15. ^ Gernah, D.I., Inyang, C.U., & Ezeora, N.L. (2007). Incubation and fermentation of African locust beans (Parkia biglobosa) in production of "dawadawa". Journal of Food Processing and Preservation, 31(2), 227-239. Retrieved November 13, 2013, from the Agricola database.
  16. ^ Heuzé V., Thiollet H., Tran G., Edouard N., Lebas F., 2018. African locust bean (Parkia biglobosa & Parkia filicoidea). Feedipedia, a programme by INRA, CIRAD, AFZ and FAO. https://www.feedipedia.org/node/268 Last updated on January 25, 2018, 13:49
  17. ^ a b Teklehaimanot, Z. (2004). Exploiting the potential of indigenous agroforestry trees: Parkia biglobosa and Vitellaria paradoxa in sub-Saharan Africa. Agroforestry Systems, 61, 207-220.
  18. ^ Karou, S., Tchacondo, T., Tchibozo, M. D., Abdoul-Rahaman, S., Anani, K., Koudouvo, K., et al. (2011). Ethnobotanical study of medicinal plants used in the management of diabetes mellitus and hypertension in the Central Region of Togo.. PharmBiol., 49(12), 1286-1297. Retrieved November 13, 2013, from the PubMed database.
  19. ^ Adetutu, A., Morgan, W., & Corcoran, O. (2011). Ethnopharmacological survey and in vitro evaluation of wound-healing plants used in South-western Nigeria.. J Ethnopharmacol, 137(1), 50-56. Retrieved November 13, 2013, from the PubMed database.
  20. ^ Traoré, M., Baldé, M., Oularé, K., Magassouba, F., Diakité, I., Diallo, A., et al. (2013). Ethnobotanical survey on medicinal plants used by Guinean traditional healers in the treatment of malaria.. J Ethnopharmacol, S0378-8741(13)00773-3. 10.1016/j.jep.2013.10.048.. Retrieved November 14, 2013, from the PubMed database.
  21. ^ Abioye, E., Akinpelu, D., Aiyegoro, O., Adegboye, M., Oni, M., & Okoh, A. (2013). Preliminary phytochemical screening and antibacterial properties of crude stem bark extracts and fractions of Parkia biglobosa (Jacq.).. Molecules, 18(7), 8459-8499. Retrieved November 13, 2013, from the PubMed database.

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