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it is a symbiotic relationship
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Nodulation in the roots of plant is a symbiotic bacterial activity and is very common in Legumenous plants, other than legume plants do not allow bacteria to establish this relationship hence nodule formation is prohibited.
The bacteria live in the plant cells, located on the root, and form nodules. These nodules convert nitrogen gas in the soil to usable energy for the plant. In return, the bacteria have a safe place to live and reproduce.
They are caused by a symbiotic bacteria which benefits the plant by fixing atmospheric nitrogen (which the plant needs to make proteins).
Legume plants are notable for their ability to fix atmospheric nitrogen, thanks to a symbiotic relationship with certain bacteria known as rhizobia found in root nodules of these plants. The ability to form this symbiosis reduces fertilizer costs for farmers and gardeners who grow legumes, and allows legumes to be used in a crop rotation to replenish soil that has been depleted of nitrogen. The nitrogen fixation ability of legumes is enhanced by the availability of calcium in the soil and reduced by the presence of ample nitrogen. Root nodules. via Wikipedia
Bacteria which are part of the Rhizobia family can "fix" nitrogen in the soil when living in a symbiotic relationship with a legume (Fabaceae) plant. The bacteria live in nodules which form on the roots of the plants, converting atmospheric nitrogen into a plant-usable form which is left in the soil for the next crop. Nitrogen is the most-needed crop nutrient of all the fertilizers, and is frequently the most expensive fertility cost for the farmer.
Bacteria which are part of the Rhizobia family can "fix" nitrogen in the soil when living in a symbiotic relationship with a legume (Fabaceae) plant. The bacteria live in nodules which form on the roots of the plants, converting atmospheric nitrogen into a plant-usable form which is left in the soil for the next crop. Nitrogen is the most-needed crop nutrient of all the fertilizers, and is frequently the most expensive fertility cost for the farmer.
Bacteria which are part of the Rhizobia family can "fix" nitrogen in the soil when living in a symbiotic relationship with a legume (Fabaceae) plant. The bacteria live in nodules which form on the roots of the plants, converting atmospheric nitrogen into a plant-usable form which is left in the soil for the next crop. Nitrogen is the most-needed crop nutrient of all the fertilizers, and is frequently the most expensive fertility cost for the farmer.
Bacteria which are part of the Rhizobia family can "fix" nitrogen in the soil when living in a symbiotic relationship with a legume (Fabaceae) plant. The bacteria live in nodules which form on the roots of the plants, converting atmospheric nitrogen into a plant-usable form which is left in the soil for the next crop. Nitrogen is the most-needed crop nutrient of all the fertilizers, and is frequently the most expensive fertility cost for the farmer.
Yes, a bacterium known as rhizobium lives inside special nodules on the roots of soybeans and other legumes. Rhizobium is able to take gaseous nitrogen from the atmosphere and turn it into an organic form, which can be use by the plant. The bacteria gets a safe place to live inside the plant and the plant gets nitrogen from the bacteria.