Nitrogen fixation by bacteria is an example of the symbiotic relationship between Rhizobium and leguminous plants. While bacteria fix nitrogen in the soil, plants provide them food.
One example of this type of nitrogen fixation is the water fern Azolla's symbiosis with a cyanobacterium Anabaena azollae. Anabaena colonizes cavities formed at the base of Azolla fronds. There the cyanobacteria fix significant amounts of nitrogen in specialized cells called heterocysts.
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Nitrogen fixation by bacteria is an example of the symbiotic relationship between Rhizobium and leguminous plants. While bacteria fix nitrogen in the soil, plants provide them food.
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One example of this type of nitrogen fixation is the water fern Azolla's symbiosis with a cyanobacterium Anabaena azollae. Anabaena colonizes cavities formed at the base of Azolla fronds. There the cyanobacteria fix significant amounts of nitrogen in specialized cells called heterocysts.