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Pigeon pea

life science Maturity 9-11 Next article →

The pigeon pea, known scientifically as Cajanus cajan, is a vital perennial legume.

Cajanus cajan, flowers
Cajanus cajan, flowers

It belongs to the Fabaceae family and is grown widely in tropical and semitropical regions. People consume this plant in many places, including South Asia, Southeast Asia, Africa, Latin America, and the Caribbean. It is often referred to as toor dal in certain regions. This plant is more than just a food source. It serves as a critical crop for rainfed agriculture in semiarid environments. Because it can survive in harsh conditions, it provides food security for many communities.

Pigeon peas dried with ruler
Pigeon peas dried with ruler

One of the most important features of the pigeon pea is its ability to perform nitrogen fixation. This is a biological process where the plant helps enrich the soil. The pigeon pea engages in a symbiosis, or a mutually beneficial relationship, with bacteria called Rhizobia. These bacteria colonize small bumps on the plant's roots known as nodules. Through this partnership, the plant can derive about 79% of its nitrogen from the atmosphere. This process helps the plant grow while simultaneously making the soil more fertile for other crops. Scientists also study plant-growth promoting rhizobacteria (PGPR) to improve this effect. Using mixed communities of different bacteria can increase the plant's dry mass and root length.

Pollen grains of Pigeon pea
Pollen grains of Pigeon pea

Different types of bacteria provide specific benefits to the pigeon pea during its growth. For example, Azotobacter chroococcum acts as a biofertilizer to promote growth. Bacillus megaterium can produce antibiotics that target harmful nematodes. It also supports nitrogen yields during the flowering and maturity stages. Pseudomonas fluorescens produces metabolites that help combat plant pathogens. Additionally, Trichoderma harzianum promotes soil health by producing enzymes that help with nutrient cycling. These various biological tools help the plant manage its environment and thrive.

Pigeon pea (Cajanus cajan (L.) Huth); branch with flowers an Wellcome V0042649
Pigeon pea (Cajanus cajan (L.) Huth); branch with flowers an Wellcome V0042649

History shows that the pigeon pea has been cultivated for thousands of years.

Shelling pigeonpeas, Kenya
Shelling pigeonpeas, Kenya

While there is debate about its exact origin, many believe it began in India. Documentation shows cultivation in peninsular India by at least 2800 BCE. Archaeological evidence also places its use in the Neolithic site of Sanganakallu. The plant likely moved from India to North-East Africa through Bronze Age trade. Evidence of pigeon peas has been found in Egyptian tombs dating to 2200 BCE. Later, the plant reached the Americas in the 17th century via the Trans-Atlantic slave trade. In Hawaii, James Macrae introduced the plant in 1824. It became popular later due to migration from the Philippines and Puerto Rico.

Cap-Vert-Pois secs
Cap-Vert-Pois secs

Global production of the pigeon pea is quite large, reaching an estimated 4.49 million tons.

India is the leading producer, accounting for 63% of the total world production. India also manages 72% of the total land used for this crop, which is 3.9 million hectares. Africa is the secondary center of diversity and provides about 21% of the global supply. Major African producers include Malawi, Tanzania, Kenya, Mozambique, and Uganda. The crop is very drought-resistant and can grow in areas with less than 650 mm of annual rainfall. This makes it a reliable alternative to crops like maize, which may fail during droughts.

Chã das Caldeiras-Pois (1)
Chã das Caldeiras-Pois (1)

The seeds of the pigeon pea are highly nutritious for humans. Mature seeds contain high levels of protein and essential amino acids. These include lysine, tryptophan, and leucine. However, the combination of methionine and cystine is a limiting amino acid in the seeds. Immature seeds offer a different nutritional profile. They contain a higher amount of vitamin C, specifically 39 mg per 100 g serving. They also tend to have a slightly higher fat content than mature seeds. Research suggests the protein quality in immature seeds is actually higher.

Dal Fry Tadka, Cumin Rice, Roasted Papad on the side
Dal Fry Tadka, Cumin Rice, Roasted Papad on the side

Despite its benefits, the pigeon pea faces challenges from various pests and diseases. Insects like the gram pod borer and the blue butterfly can damage the plant. The spotted pod borer is known for webbing together flowers and pods. Another pest, the tur pod bug, causes significant damage to the seeds. Diseases such as Fusarium wilt also impact crop yields. To manage these issues, farmers use integrated pest management (IPM) strategies. These include crop rotation, intercropping with other plants, and using biological control agents. Farmers may also use neem-based products to protect their harvests.

São Filipe-Plat de petits pois
São Filipe-Plat de petits pois
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🖼️ Images & Media (10)
File:Pigeon pea (Cajanus cajan (L.) Huth); branch with flowers an Wellcome V0042649.jpg
Pigeon pea (Cajanus cajan (L.) Huth);...
File:Pigeon peas dried with ruler.jpg
Pigeon peas dried with ruler.jpg
File:Cajanus cajan, flowers.jpg
Cajanus cajan, flowers.jpg
File:Pollen grains of Pigeon pea.jpg
Pollen grains of Pigeon pea.jpg
File:Cap-Vert-Pois secs.jpg
Cap-Vert-Pois secs.jpg
File:Chã das Caldeiras-Pois (1).JPG
Chã das Caldeiras-Pois (1).JPG
File:Shelling pigeonpeas, Kenya.jpg
Shelling pigeonpeas, Kenya.jpg
File:São Filipe-Plat de petits pois.jpg
São Filipe-Plat de petits pois.jpg
File:Dal Fry Tadka, Cumin Rice, Roasted Papad on the side.jpg
Dal Fry Tadka, Cumin Rice, Roasted Papad...
File:Poids d’engole murs dans les gousses dépose dans 1 plastiques jaune au Bénin.jpg
Poids d’engole murs dans les gousses...
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