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Rhizobia
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Rhizobia are diazotrophic bacteria that fix nitrogen after becoming established inside the root nodules of legumes. To express genes for nitrogen fixation, rhizobia require a plant host; they cannot i
Root nodules, each containing billions of Rhizobiaceae bacteria
Root nodules, each containing billions of Rhizobiaceae bacteria
Rhizobia nodules on Vigna unguiculata
Rhizobia nodules on Vigna unguiculata
Root nodule
Videos
Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship
Indeterminate nodules growing on the roots of Medicago italica
Indeterminate nodules growing on the roots of Medicago italica
Sectioned
Sectioned
Whole
Whole
Cross section through a soybean root nodule. The bacterium, Bradyrhizobium japonicum, colonizes the roots and establishes a nitrogen fixing symbiosis.
Cross section through a soybean root nodule. The bacterium, Bradyrhizobium japonicum, colonizes the roots and establishes a nitrogen fixing symbiosis. This high magnification image shows part of a cell with single bacteroids within their symbiosomes. In this image, endoplasmic reticulum, dictysome and cell wall can be seen.