SEM of fractured root nodule of pea plant

SEM of fractured root nodule of pea plant

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Caption: Scanning electron micrograph of a fractured root nodule of the pea plant, Pisum sativum, showing internal cells infected with the nitrogen fixing bacteroids Rhizobium leguminosarum (grey). The darker cells with cross walls are uninfected cells. The bacteria convert atmospheric nitrogen into an organic form, which can be used by the plant. Rhizobium infects 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 as many as 10,000 bacteriods. Mag: X1000 (at 10x8 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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