Rhizobium nodules on a clover root, SEM

Bildnummer 13426136
Rhizobium nodules on a clover root, SEM
Coloured scanning electron micrograph (SEM) of nitrogen-fixing nodules on a root of clover (Trifolium repens). At centre (brown) is a small nodule, with a second to bottom left. They are the plant's reaction to an infection by the soil bacterium R. leguminosarum. Inside the nodule, the bacterium is able to 'fix' atmospheric nitrogen, producing ammonium salts. This is an example of symbiosis (mutualism); the bacterium benefits from plant carbohydrates made by photosynthesis, and the plant benefits from the fixed nitrogen. Artificial fertilisers contain nitrogen as ammonium or nitrates; leguminous crops that support a variety of Rhizobium species require less applied chemical fertiliser. The amount of nitrogen fixed globally by bacteria (principally Rhizobium spp.) is about 150-200 million tonnes per year, or three times the output of the global chemical fertiliser industry. Magnification: x25 at 10x8.
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / Burgess, Dr. Jeremy
Bildgröße: 3468 px × 5212 px
Modell-Rechte: nicht erforderlich
Eigentums-Rechte: nicht erforderlich
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