Cowpea
Cowpea | |
---|---|
Cowpeas | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Rosids |
Order: | Fabales |
Family: | Fabaceae |
Subfamily: | Faboideae |
Genus: | Vigna |
Species: | V. unguiculata
|
Binomial name | |
Vigna unguiculata | |
Synonyms[1][2][3] | |
List
|
The cowpea (Vigna unguiculata) is an annual herbaceous legume from the genus Vigna. Its tolerance for sandy soil and low rainfall have made it an important crop in the semiarid regions across Africa and Asia. It requires very few inputs, as the plant's root nodules are able to fix atmospheric nitrogen, making it a valuable crop for resource-poor farmers and well-suited to intercropping with other crops. The whole plant is used as forage for animals, with its use as cattle feed likely responsible for its name.
Four subspecies of cowpeas are recognised, of which three are cultivated. A high level of
Cowpeas were domesticated in Africa[4] and are one of the oldest crops to be farmed. A second domestication event probably occurred in Asia, before they spread into Europe and the Americas. The seeds are usually cooked and made into stews and curries, or ground into flour or paste.
Most cowpeas are grown on the African continent, particularly in Nigeria and Niger, which account for 66% of world production. A 1997 estimate suggests that cowpeas are cultivated on 12.5 million hectares (31 million acres) of land, have a worldwide production of 3 million tonnes and are consumed by 200 million people on a daily basis.[5] Insect infestation is a major constraint to the production of cowpea, sometimes causing over 90% loss in yield.[6] The legume pod borer Maruca vitrata is the main preharvest pest of the cowpea and the cowpea weevil Callosobruchus maculatus the main postharvest pest.
Taxonomy and etymology
Vigna unguiculata is a member of the Vigna (peas and beans) genus. Unguiculata is Latin for "with a small claw", which reflects the small stalks on the flower petals.[7] Common names for cultivated cowpeas include black-eye pea,[8] southern pea,[9] niebe[10] (alternatively ñebbe),[11] and crowder pea.[12] All cultivated cowpeas are found within the universally accepted V. unguiculata subspecies unguiculata classification, which is then commonly divided into four cultivar groups: unguiculata, biflora, sesquipedalis, and textilis.[13][14] The classification of the wild relatives within V. unguiculata is more complicated, with over 20 different names having been used and between 3 and 10 subgroups described.[13][15] The original subgroups of stenophylla, dekindtiana, and tenuis appear to be common in all taxonomic treatments, while the variations pubescens and protractor were raised to subspecies level by a 1993 characterisation.[13][16]
The first written reference of the word 'cowpea' appeared in 1798 in the United States.[7] The name was most likely acquired due to their use as a fodder crop for cows.[17] Black-eyed pea, a common name used for the unguiculata cultivar group, describes the presence of a distinctive black spot at the hilum of the seed. Black-eyed peas were first introduced to the southern states in the United States and some early varieties had peas squashed closely together in their pods, leading to the other common names of southern pea and crowder pea.[7]
The sesquipedalis subspecies arrived in the United States via Asia. It is characterised by unusually long pods, leading to the Latin name (sesquipedalis means "foot and a half long") and the common names of yardlong bean, asparagus bean, and Chinese long-bean.[18]
Group |
Common name |
---|---|
Unguiculata | black-eyed pea, crowder-pea, southern pea, niebe, ñebbe |
Biflora | catjang, sow-pea |
Sesquipedalis | yardlong bean , asparagus bean, Chinese long-bean
|
Textilis | wild cowpea, African cowpea, Ethiopian cowpea |
Description
A large morphological diversity is found within the crop, and the growth conditions and grower preferences for each variety vary from region to region.[13] However, as the plant is primarily self-pollinating, its genetic diversity within varieties is relatively low.[19] Cowpeas can either be short and bushy (as short as 20 cm or 8 in) or act like a vine by climbing supports or trailing along the ground (to a height of 2 m or 6 ft 7 in).[20][21] The taproot can penetrate to a depth of 2.4 m (7 ft 10 in) after eight weeks.[22]
The size and shape of the leaves vary greatly, making this an important feature for classifying and distinguishing cowpea varieties.[23] Another distinguishing feature of cowpeas is the long 20–50 cm (8–20 in) peduncles, which hold the flowers and seed pods. One peduncle can support four or more seed pods.[22] Flower colour varies through different shades of purple, pink, yellow, and white and blue.[21]
Seeds and seed pods from wild cowpeas are very small,[22] while cultivated varieties can have pods between 10 and 110 cm (4 and 43 in) long.[24] A pod can contain six to 13 seeds that are usually kidney-shaped, although the seeds become more spherical the more restricted they are within the pod.[20][22] Their texture and colour are very diverse. They can have a smooth or rough coat and be speckled, mottled, or blotchy. Colours include white, cream, green, red, brown, and black, or various combinations.[22]
History
Compared to most other important crops, little is known about the
While the date of cultivation began may be uncertain, it is still considered one of the oldest domesticated crops.[27] Remains of charred cowpeas from rock shelters in Central Ghana have been dated to the 2nd millennium BC.[28] In 2300 BC, the cowpea is believed to have made its way into Southeast Asia, where secondary domestication events may have occurred.[14] From there they traveled north to the Mediterranean, where they were used by the Greeks and Romans.[29] The first written references to the cowpea were in 300 BC and they probably reached Central and North America during the slave trade through the 17th to early 19th centuries.[14][26]
Cultivation
Cowpeas thrive in poor dry conditions, growing well in soils up to 85% sand.
The optimum temperature for cowpea growth is 30 °C (86 °F), making it only available as a summer crop for most of the world. It grows best in regions with an annual rainfall between 400 and 700 mm (16 and 28 in). The ideal soils are sandy and it has better tolerance for infertile and acid soil than most other crops. Generally, 133,000 seeds are planted per hectare (54,000/acre) for the erect varieties and 60,000 per hectare (24,000/acre) for the climbing and trailing varieties. The seeds can be harvested after about 100 days or the whole plant used as forage after about 120 days. Leaves can be picked from 4 weeks after planting.[33]
These characteristics, along with its low
Storage of the seeds can be problematic in Africa due to potential infestation by postharvest pests. Traditional methods of protecting stored grain include using the insecticidal properties of
Pests and diseases
Insects are a major factor in the low yields of African cowpea crops, and they affect each tissue component and developmental stage of the plant. In bad infestations, insect pressure is responsible for over 90% loss in yield.[6] The legume pod borer, Maruca vitrata, is the main preharvest pest of the cowpea.[40] Other important pests include pod sucking bugs, thrips, aphids, cowpea curculios and the post-harvest cowpea weevil, Callosobruchus maculatus.[6][41][42][43]
M. vitrata causes the most damage to the growing cowpea due to their large
Severe C. maculatus infestations can affect 100% of the stored peas and cause up to 60% loss within a few months.[47][48] The weevil generally enters the cowpea pod through holes before harvest and lays eggs on the dry seed.[49] The larvae burrow their way into the seed, feeding on the endosperm. The weevil develops into a sexually mature adult within the seed.[50] An individual bruchid can lay 20–40 eggs, and in optimal conditions, each egg can develop into a reproductively active adult in 3 weeks.[51] The most common methods of protection involve the use of insecticides, the main pesticides used being carbamates, synthetic pyrethroids, and organophosphates.[52]
Cowpea is susceptible to
Besides biotic stresses, cowpea also faces various challenges in different parts of the world such as drought, heat, and cold.[59] Drought lowers the growth rate and development, ultimately reducing yield, although cowpea is considered more drought tolerant than most other crops.[60] Drought at the preflowering stage in cowpea can reduce the yield potential by 360 kg/ha.[61] Crop wild relatives are the prominent source of genetic material, which can be tapped to improve biotic/abiotic tolerance in crops.[62] International Institute of Tropical Agriculture (IITA), Nigeria and Institut de l’Environment et de Recherches Agricoles are looking to tap into the genetic diversity of wild cowpeas and transfer that into cultivars to make them more tolerant to different stresses and adaptive to climate change.[63]
Culinary use
Cowpeas are grown mostly for their edible beans, although the leaves, green seeds and pods can also be consumed, meaning the cowpea can be used as a food source before the dried peas are harvested.[64] Like other legumes, cowpeas are cooked to make them edible, usually by boiling.[65] Cowpeas can be prepared in stews, soups, purees, casseroles and curries.[66][67] They can also be processed into a paste or flour.[68] Chinese long beans can be eaten raw or cooked, but as they easily become waterlogged are usually sautéed, stir-fried, or deep-fried.[69]
A common snack in Africa is koki or moin-moin, where the cowpeas are mashed into a paste, mixed with spices and steamed in banana leaves.
Nutrition and health
Nutritional value per 100 g (3.5 oz) | |
---|---|
Energy | 336 kcal (1,410 kJ) |
60.03 g | |
Sugars | 6.9 g |
Dietary fiber | 10.6 g |
1.26 g | |
23.52 g | |
Niacin (B3) | 13% 2.075 mg |
Vitamin B6 | 21% 0.357 mg |
Folate (B9) | 158% 633 μg |
Vitamin C | 2% 1.5 mg |
Vitamin K | 4% 5 μg |
Minerals | Quantity %DV† |
Calcium | 8% 110 mg |
Iron | 46% 8.27 mg |
Magnesium | 44% 184 mg |
Phosphorus | 34% 424 mg |
Potassium | 37% 1112 mg |
Sodium | 1% 16 mg |
Zinc | 31% 3.37 mg |
Other constituents | Quantity |
Water | 11.95 g |
†Percentages estimated using US recommendations for adults,[74] except for potassium, which is estimated based on expert recommendation from the National Academies.[75] |
Cowpea seeds provide a rich source of proteins and
The cowpea has often been referred to as "poor man's meat" due to the high levels of protein found in the seeds and leaves.[65] However, it does contain some antinutritional elements, notable phytic acid and protease inhibitors, which reduce the nutritional value of the crop.[68] Methods such as fermentation, soaking, germination, debranning, and autoclaving are used to combat the antinutritional properties of the cowpea by increasing the bioavailability of nutrients within the crop.[79] Although little research has been conducted on the nutritional value of the leaves and immature pods, what is available suggests that the leaves have a similar nutritional value to black nightshade and sweet potato leaves, while the green pods have less antinutritional factors than the dried seeds.[68]
Production and consumption
Country | Weight (tonnes) |
---|---|
Nigeria | 3,647,115 |
Niger | 2,637,486 |
Burkina Faso | 666,023 |
Kenya | 264,160 |
Senegal | 253,897 |
All others | 1,447,422 |
World | 8,916,103 |
Most cowpeas are grown on the African continent, particularly in Nigeria and Niger, which account for 66% of world cowpea production.[81] The Sahel region also contains other major producers such as Burkina Faso, Ghana, Senegal, and Mali. Niger is the main exporter of cowpeas and Nigeria the main importer. Exact figures for cowpea production are hard to come up with as it is not a major export crop. Estimating world cowpea production is rather difficult, as it is usually grown in a mixture with other crops, but according to a 1997 estimate, cowpeas were cultivated on 12.5 million hectares (31 million acres) and had a worldwide production of 3 million metric tons (3,000,000 long tons; 3,300,000 short tons).[5] While they play a key role in subsistence farming and livestock fodder, the cowpea is also seen as a major cash crop by Central and West African farmers, with an estimated 200 million people consuming cowpea on a daily basis.[82]
According to the
Outside Africa, the major production areas are Asia, Central America, and South America. Brazil is the world's second-leading producer of cowpea seed, accounting for 17% of annual cowpea production, although most is consumed within the country.[4]
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External links
- Cowpea research at the International Institute of Tropical Agriculture (IITA)
- Network for Genetic Improvement of Cowpea for All (NGICA)
- Consensus Document on Compositional Considerations for New Varieties of COWPEA (Vigna unguiculata): Key Food and Feed Nutrients, Anti-nutrients and Other Constituents, OECD Series on the Safety of Novel Foods and Feeds No. 30
- Adam D. Steinbrenner, Maria Muñoz-Amatriaín, Antonio F. Chaparro, Jessica Montserrat Aguilar-Venegas, Sassoum Lo, Satohiro Okuda, Gaetan Glauser, Julien Dongiovanni, Da Shi, Marlo Hall, Daniel Crubaugh, Nicholas Holton, Cyril Zipfel, Ruben Abagyan, Ted C. J. Turlings, Timothy J. Close, Alisa Huffaker, and Eric A. Schmelz: A receptor-like protein mediates plant immune responses to herbivore-associated molecular patterns. In: PNAS. November 23, 2020. doi:10.1073/pnas.2018415117. See also:
- Carly Cassella: Saliva From Hungry Caterpillars Alerts Cowpea Plants to Turn on Their Defenses. On: sciencealert. 5 December 2020