Legume
Legumes are nitrogen-fixing plants vital for agriculture and human nutrition.
Legumes are plants in the pea family Fabaceae (or Leguminosae), or the fruit or seeds of such plants. When used as a dry grain for human consumption, the seeds are also called pulses. Legumes are grown agriculturally, primarily for human consumption, but also as livestock forage and silage, and as soil-enhancing green manure. They produce a botanically unique type of fruit—a simple dry fruit that develops from a simple carpel and usually dehisces on two sides. Most legumes have symbiotic nitrogen-fixing bacteria, Rhizobia, in root nodules, playing a key role in crop rotation.
- Classification
- Family Fabaceae (Leguminosae)
- Proportion of flowering plants
- About seven percent
- Primary uses
- Human consumption, livestock forage, silage, green manure
- Key ecological role
- Nitrogen fixation via Rhizobia bacteria
Lore & Background
Legumes are the third-largest land plant family by species, behind Orchidaceae and Asteraceae. They include a wide variety of crops such as beans, lentils, chickpeas, and peas. The United Nations' Food and Agriculture Organization (FAO) recognizes 11 primary pulses, excluding green vegetable legumes and those used mainly for oil extraction or as seed. Legumes produce a unique dry fruit that opens along two seams. Many legumes host symbiotic Rhizobia bacteria in root nodules, which convert atmospheric nitrogen into ammonia, enriching the soil. This nitrogen becomes available to later crops, making legumes essential in crop rotation and traditional farming practices.
Reader's Guide
Legumes are significant for their dual role in human nutrition and soil fertility. They are a key source of protein, dietary fiber, carbohydrates, and minerals; for example, cooked chickpeas provide 18% of the daily value for protein and 52% for manganese. Legumes also contain resistant starch, which produces short-chain fatty acids beneficial for intestinal health. In agriculture, legumes fix nitrogen through Rhizobia bacteria, reducing the need for synthetic fertilizers. They are used as forage for livestock, improving animal performance over perennial grasses. Storage of legume seeds requires careful control of temperature and humidity to maintain viability, with seeds lasting about 5 years under optimal conditions.
Did You Know?
- The FAO recognizes 11 primary pulses, excluding green beans, soybeans, and forage seeds like clover.
- Legume root nodules contain Rhizobia bacteria that fix atmospheric nitrogen into ammonia.
- Adding salt before cooking legumes does not prevent them from cooking through; it results in better seasoning.
Frequently Asked Questions
What are Legume's powers/role?
Legume's signature ability is hosting Rhizobia bacteria inside root nodules, which convert atmospheric nitrogen into a form plants can absorb. This nitrogen-fixing trait makes legumes indispensable partners in crop rotation and soil health.
How does Legume's story end?
Legume's narrative never truly concludes because the family remains a living, evolving group of species still cultivated and studied today. Its ongoing role in global food systems and ecosystem support ensures the story continues with every new harvest and research discovery.
Why is Legume important?
Legume seeds—often called pulses when dried for eating—are a cornerstone of human nutrition worldwide. Beyond the plate, legumes serve as livestock forage, silage, and green manure that enriches soil for subsequent crops.
What is Legume's unique fruit type?
Legume produces a distinctive simple dry fruit that forms from a single carpel and typically splits open along two seams to release its seeds. This dehiscent pod structure is a defining botanical trait that sets the family apart from other plant groups.
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