Arachis hypogaea L.

Last updated: 07 April 2015

Scientific Name

Arachis hypogaea L.

Synonyms

Arachis nambyquarae Hoehne, Lathyrus esquirolii H. Lév. [1]

Vernacular Name

Malaysia Kacang china, kacang jawa, kacang goring [2]
English Groundnut, peanut [2]
China Di duo, chang sheng guo [3]
India Cini badama, moong phali, mosambi cana, mumg phali, muungaphalii (Hindi); nellakkadalai, nilakkatala (Malayalam); bhui muga (Marathi); bhu canaka, mandapi (Sanskrit); mugphalii (Urdu) [3]
Indonesia Kacang tanah, kacang jawa, kacang Manila [2]
Thailand Thua lisong, thua din [2][3]
Laos Thwàx din, thwàx ho [2]
Myanmar Mye pai [3]
Philippines Mani, batung-China [2]
Cambodia Sânndaèk dèi [2][3]
Vietnam lac [2], dâu phong [3]
Korea Ttang kong [3]
Japan Nankinmame, piinatsu, rakkasei [3]
Nepal Mungphalii [3]
Saudi Arabia Fûl sûdânî, fûl sûdânî [3]
Africa Apeneutjie, grondboontjie [3]
Papua New Guinea Galip bilong giraun, kasang [2]
Denmark Jordnød, jordnødder, jordnoedder [3]
Netherlands Aardnoot, grondnoot, pindaplant [3]
Poland Orzech ziemny, orzacha podziemna [3]
Finland Maapähkinä [3]
France Arachide [2], cacahuète, pistache de terre, pistachier de terre [3]
Germany Erdnuß, echte erdnuss, erdmandel [3]
Italy Arachide, mandorla di terra, nocciolina, pistacchio di terra [3]
Portugal Amendoim verdadeiro, aráquida, jinguba, mancarra, mendoim, mendubi, mondubim [3]
Spain Alcagüeses, aráquido, avellana americana, cacahuate, maní [3]
Russia Arakhis [3].

Geographical Distributions

Arachis hypogaea is originated in the southern Bolivia and north-western Argentina area of South America. It is believed that the Portuguese took them from Brazil to West Africa and then to southwest India in the 16th century. Africa is now regarded as a secondary centre of diversity. At the same time also the Spaniards introduced A. hypogaea from Mexico to the western Pacific from where they spread to China, Indonesia and Madagascar. The Dutch also probably took A. hypogaea from Brazil to Indonesia in the middle of the 17th century. The groundnuts are thought to have been introduced to the USA on slave ships from Africa, although they may have been introduced directly from the Caribbean Islands. A. hypogaea is now grown in most tropical, subtropical and temperate countries between 40°N and 40°S latitude. They are most important in Africa, Asia, North America and South America. In Asia, A. hypogaea is a major crop in India, China, Indonesia, Burma, Thailand and Vietnam. [2]

A. hypogaea is grown between 40°N and 40°S latitudes in warm tropical and subtropical environments and in temperate humid climates with sufficiently long warm summers. Optimum means a daily temperature for growth is around 30°C, while growth ceases at about 15°C. The phenology of A. hypogaea is determined primarily by temperature, with cool temperatures delaying flowering. [2]

Botanical Description

A. hypogaea comes from the family of Leguminosae. It is a monoecious, prostrate to erect annual herb and it is usually 15-70 cm high. [2]

The root system consists of a well-developed taproot with many lateral roots and able to penetrate to depths in excess of 2 m. Root hair is absent while the nitrogen-fixing nodules are present. [2]

The main stem or central axis develops from the epicotyl and bears a cotyledon at each of the first two nodes. It has dimorphic branching with vegetative and contracted reproductive branches. All vegetative branches are characterised by the presence of scale leaves that called cataphylls and subtending the first two nodes of the branch. The secondary and tertiary vegetative branches can develop from the primary vegetative branches. [2]

The leaves on the central stem are spirally arranged in a 2/5 phyllotaxy while on the primary vegetative branches and the arrangement is distichous. The leaves are 4-foliolate and measuring 3-7 cm x 2-3 cm with two opposite pairs of obovate leaflets. The petiole is 3-7 cm long. The pulvini is at the base of the petiole and at the base of each leaflet cause characteristic night movements in which the petiole folds downwards and the leaflets fold upwards until they are touch. [2]

The contracted reproductive branches or inflorescences are formed singly at both cataphyllar and ordinary leaf axils on vegetative branches and, in some forms at the higher nodes on the central stem. Each inflorescence bears 2-5 flowers. The short (axillary) branches develop in the axils of simple bracts which occur along the central axis of the inflorescence. These axillary branches of the inflorescence terminate after the production of one leaf and in the axil of which the flower is borne. An inflorescence never occurs in the same leaf axil as a vegetative branch. [2]

The flowers are sessile, consist of 4-6 cm long tubular hypanthium (fused lower parts of calyx, petal and staminal tube), at the top of which are borne expanded lobes of the 5 sepals and petals (pale yellow through to orange-red), and 10 short filaments with anthers. [2]

The superior ovary of single sessile carpel is with 2-6 ovules and situated at the base of the hypanthium tube. The style is free within the tube and ends in a club-shaped stigma among the anthers. After fertilisation, a stalk-like structure called 'peg' or gynophore elongates where an intercalary meristem is at the base of the ovary. The peg curves to grow down towards the soil and carry the ovary at its tip which becomes hardened into a protective cap as the peg enters the soil. The length of the peg depends on the initial distance of the flower from the soil, but if this is more than 15 cm long, it usually fails to reach the ground and the tip dies. When the peg has penetrated the soil to a depth of 2-7 cm, it turns horizontal and fruit development begins as the tip swells rapidly. [2]

The mature fruits (pods) are cylindrical, measuring 1-8 cm x 0.5-2 cm and contain 1-6 seeds. The pod surface, or pericarp, may be constricted to varying degrees between the seeds and reticulated because of the presence of veins in the hardened mesocarp. [2]

The mature seeds, or kernels are cylindrical to ovoid and measuring 1-2 cm x 0.5-1 cm. Each seed is enclosed in a thin papery testa with colours that ranging from white to pink, red, purple, tan and shades of brown. Each seed has two large cotyledons where an epicotyl is with leaf and bud primordia, a hypocotyl and the primary root. Upon epigeal germination, the primary root elongates rapidly which reach 10-12 cm long before the lateral roots appear. As growth proceeds, the outer layer of the primary root of a seedling is sloughed off so that the root hairs do not form. [2]

Cultivation

In controlled environments, photoperiod has been shown to influence the proportion of flowers producing pods and assimilate distribution between vegetative and reproductive structures (harvest index) in some cultivars. Generally, long photoperiods (greater than 14 hrs) increase the vegetative growth and short photoperiods (less than 10 hrs) increase the reproduction growth. However, the significance of these effects in crop communities in the tropics and subtropics has yet to be established. Between 500 and 600 mm of water reasonably well distributed through the growing season will enable satisfactory groundnut production. Nevertheless, A. hypogaea is a drought tolerant species and able to withstand high internal water deficits, although yield reductions will generally result. Because pods are developed underground and must be recovered at harvest, friable well drained soils are preferred, although adequate plant growth and development will occur on heavier clay soils. For optimum growth, the soil pH should be in the range of 5.5-6.5, although Spanish types tolerate more acid conditions (to pH 4.5) and some cultivars grow well in alkaline soils to pH 8.5. [2]

Chemical Constituent

No documentation

Plant Part Used

No documentation

Traditional Use

No documentation

Preclinical Data

No documentation

Clinical Data

No documentation

Dosage

No documentation

Poisonous Management

No documentation

Line drawing

351

Figure 1: The line drawing of A. hypogaea L. [2]

References

  1. The Plant List. Ver1.1. Arachis hypogaea L. [homepage on the Internet]. c2013 [updated 2012 Apr 18; cited 2015 Apr 07]. Available from: http://www.theplantlist.org/tpl1.1/record/ild-2050
  2. Shorter R, Patanothai A. Arachis hypogaea L. In: van der Maesen LJG, Somaatmadja S, editors. Plant Resources of South-East Asia No. 1: Pulses. Wageningen, Netherlands: Pudoc Scientific Publisher, 1989; p. 35-39.
  3. Philippines medicinal plants. Arachis hypogaea L. [homepage on the Internet]. c2014 [updated 2013; cited 2015 April 8] Available from http://www.stuartxchange.com/Mani.html