Root nodules of broad beans

Root nodules of broad beans

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Credit: ADAM HART-DAVIS/SCIENCE PHOTO LIBRARY

Caption: Macrophotograph of root nodules on the roots of the broad bean Vicia faba, caused by the nitrogen-fixing bacteria Rhizobium sp. The bacteria convert atmospheric nitrogen into a usable organic form, something the broad bean cannot do for itself, but which is nutritionally necessary for its survival. Bacteria infect the plant through root hairs, forming an infection thread, which conveys them from the entry point to the nodule site.

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Keywords: bacteria, bacterial, bacteriology, bacterium, bean, broad, micro-organisms, microbe, microbes, microbiology, nitrogen-fixing, nodule nodules, plant, root hair, root roots, root system, soil, symbiosis, vicia faba

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