Nitrogen-fixing root nodule of clover plant

Nitrogen-fixing root nodule of clover plant

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Caption: Scanning electron micrograph of a young root nodule on the white clover plant, Trifolium repens, caused by the nitrogen-fixing bacteria Rhizobium trifolii. The bacteria convert atmospheric nitrogen into a usable organic form, something the clover cannot do, but which is imperative for its survival. Bacteria infect the plant through root hairs, forming the nodule site. Here they divide repeatedly, swell and become known as bacteroids. The nodule consists of a central region filled with bacter- oids surrounded by a spongy region, the cortex, seen here. Magnification: x3000 at 8x10 inch size.

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Keywords: bacteria, bacterial, bacteriology, bacterium, clover, micro-organisms, microbe, microbes, microbiology, nitrogen-fixing, nitrogen-fixing bacteria, plant, rhizobium trifolii, scanning electron micrograph, sem, soil, symbiosis, trifolium repens

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