LM of a root nodule

LM of a root nodule

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Credit: ASTRID & HANNS-FRIEDER MICHLER/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a section of a root nodule from a leguminous plant showing cells containing the bacteria Rhizobium sp. The bacteria form a nitrogen-fixing symbiosis with the legume; it converts atmospheric nitrogen into a usable organic form essential for the plant's survival. Entering the plant via the root hairs, the bacteria migrate via an infection thread to the nodule site. After dividing repeatedly & swelling, they become bacteroids. The nodule consists of a central region filled with bacteroids surrounded by a loose, spongy cortex. 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, soil, symbiosis

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