LM of a root nodule

LM of a root nodule

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Caption: Light micrograph of a root nodule of a leguminous plant. The nodule develops in response to invasion by the bacteria Rhizobium sp. The bacteria convert atmospheric nitrogen into a usable organic form, something the plant cannot do itself, but which is imperative for its survival. Bacteria enter the plant through root hairs and form an infection thread which conveys them to the nodule site. Once there, they divide repeatedly & swell. They are now known as bacteroids. The nodule consists of a central region (at right) filled with bacteroids surrounded by a loose, spongy region, the cortex (at left). Magnification: x30 at 35cm size.

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Keywords: bacteria, bacteria in root, bacterial, bacteriology, bacterium, light micrograph, micro-organisms, microbe, microbes, microbiology, nitrogen-fixing, nitrogen-fixing bacteria, soil, symbiosis

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