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Rhizobia are a "group of soil bacteria that infect the roots of legumes to form root nodules". [2] Rhizobia are found in the soil and, after infection, produce nodules in the legume where they fix nitrogen gas (N 2) from the atmosphere, turning it into a more readily useful form of nitrogen. From here, the nitrogen is exported from the nodules ...
Nitrogen fixation is one of the most beneficial processes performed by rhizobacteria. Nitrogen is a vital nutrient to plants and gaseous nitrogen (N 2) is not available to them due to the high energy required to break the triple bonds between the two atoms. [4]
Rhizobium is a genus of Gram-negative soil bacteria that fix nitrogen. Rhizobium species form an endosymbiotic nitrogen-fixing association with roots of (primarily) legumes and other flowering plants.
The curling begins with the very tip of the root hair curling around the Rhizobium. Within the root tip, a small tube called the infection thread forms, which provides a pathway for the Rhizobium to travel into the root epidermal cells as the root hair continues to curl. [17] Partial curling can even be achieved by nod factor alone. [16]
The role that rhizobia play in fixing nitrogen for legumes is the basis for why legumes can be used in crop rotation. [4] Mycorrhizae – Mycorrhizae are similar to rhizobia in that they interact with plants at their roots. Whereas rhizobia are bacteria that fix nitrogen, mycorrhizae are fungi that bring nutrients to the plants in return for ...
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Nod factors (nodulation factors or NF), are signaling molecules produced by soil bacteria known as rhizobia in response to flavonoid exudation from plants under nitrogen limited conditions. Nod factors initiate the establishment of a symbiotic relationship between legumes and rhizobia by inducing nodulation.
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