Lupin root nodules, light micrograph

Lupin root nodules, light micrograph


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Lupin root nodules. Light micrograph of a section through the root nodule of a lupin (Lupinus lupin) plant. The plant's root nodules are full of nitrogen-fixing Rhizobium sp. bacteria that form a symbiotic relationship with the plant. They take nitrogen from the air and fix it to nitrogenous substances that can be used by the plant. This enables the host plant to grow in soils deficient in these nitrogenous substances. In return the host plant passes sugars, water and minerals to the bacteria in its roots. Magnification: x70 when printed 10 centimetres wide.

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