Pea root nodule with nitrogen-fixing bacteria

Pea root nodule with nitrogen-fixing bacteria

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY.

Caption: Scanning electron micrograph of a fractured root nodule of the pea plant, Pisum sativum, showing cells infected with the nitrogen fixing bacteria Rhizobium leguminosarum (grey). The darker cells with cross walls are uninfected cells. The bacteria convert atmospheric nitrogen into an organic form, which is used by the plant. They infect the plant through root hairs, forming an infection thread, which conveys them from the entry point to the nodule site. Here they divide repeatedly, swell, are surrounded by a membrane & become known as bacteroids. One infected cell may contain about 10, 000 bacteriods. Magnification: x2000 at 10x8 inch size.

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Keywords: bacteria, bacterial, bacteriology, bacterium, bacteroids, micro-organisms, microbe, microbes, microbiology, nitrogen-fixing, nitrogen-fixing bacteria, pisum sativum, rhizobium leguminosarum, root nodule, scanning electron micrograph, sem, soil, symbiosis

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