Legume Symbiosis
Legume Symbiosis - Related Videos
00:58
Symbiosis
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2026
Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
11:28
Layers of Symbiosis - Visualizing the Termite Hindgut Microbial Community
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Cited by 1 •
2007
Jared Leadbetter takes us for a nature walk through the diversity of life resident in the termite hindgut - a microenvironment containing 250 different species found nowhere else on Earth. Jared reveals that the symbiosis exhibited by this system is multi-layered and involves not only a relationship between the termite and its gut inhabitants, but also involves a complex web of symbiosis among the gut microbes themselves.
20:01
Single-plant, Sterile Microcosms for Nodulation and Growth of the Legume Plant Medicago truncatula with the Rhizobial Symbiont Sinorhizobium meliloti
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Cited by 9 •
2013
Growth of Medicago truncatula plants in symbiosis with the nitrogen-fixing bacteria Sinorhizobium meliloti in individual, sterile microcosms made from standard laboratory plates permits frequent examination of root systems and nodules without compromising sterility. Plants can be maintained in these growth chambers for up to 9 weeks.
07:32
Protocols for Obtaining Zygotic and Somatic Embryos for Studying the Regulation of Early Embryo Development in the Model Legume Medicago truncatula
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Cited by 2 •
2015
The goal is to illustrate that the model legume Medicago truncatula can be readily utilized to investigate the regulation of early plant embryogenesis to complement the non-legume Arabidopsis model. Pod morphology is linked to zygotic embryogenesis stages and a protocol to collect embryos using tissue culture is also provided.
07:43
Production of Arbuscular Mycorrhizal (AM) Fungal Inoculum and Phenotypic Evaluation of Rice and AM Symbiosis Under Saline Conditions
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2025
This article describes a protocol for generating arbuscular mycorrhizal (AM) fungi inoculum to investigate AM-enhanced salt stress tolerance in rice.
FAQs
Root-released flavonoids act as chemical signals that activate compatible soil bacteria. In response, the bacteria produce Nod factors, which initiate recognition and root-hair infection. This signal exchange links bacterial entry with the plant’s developmental response, allowing the association to progress toward formation of the specialized root nodules required for nitrogen fixation.
Nitrogen fixation requires energy, and the bacterial nitrogenase system receives that energy through carbon supplied by the plant. This creates a direct nutritional connection: the plant provides a carbon-based energy source, while the bacteria convert atmospheric nitrogen into ammonia. The exchange enables plant nitrogen acquisition even when available soil nitrogen is limited.
Within the developing nodule, bacterial cells differentiate into bacteroids, a specialized form associated with nitrogen fixation. This differentiation marks a functional transition from free-living soil bacteria to symbiotic partners operating in plant tissue. It helps establish the cellular organization needed for nitrogenase activity and ammonia production within the nodule environment.
By converting atmospheric nitrogen into ammonia, the association supplies the plant with a usable nitrogen source rather than relying entirely on nitrogen already present in soil. This biological input can reduce dependence on synthetic fertilizers, particularly in nitrogen-poor settings. Its agricultural value therefore connects microbial activity with plant nutrition and fertilizer management.
Including legumes in crop rotation can contribute biological nitrogen inputs to agricultural systems through their association with nitrogen-fixing bacteria. This supports soil fertility and may lessen the need for synthetic nitrogen additions in subsequent production cycles. The practice also places symbiosis within a broader management strategy for maintaining nutrient availability across crops.
The association supports plant growth in environments where soil nitrogen is scarce and contributes to ecosystem nutrient cycling. In agriculture, those effects are relevant to natural fertilization, reduced synthetic fertilizer use, and soil-fertility management. Legume symbiosis therefore links molecular signaling and bacterial nitrogen fixation with outcomes that extend from individual plants to managed ecosystems.