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FREE-LIVING BACTERIA [1 record]

Record 1 2012-02-29

English

Subject field(s)
  • Ecosystems
CONT

Symbiotic fixation is the most powerful natural way of adding N to soil. Plants in the Legume family(beans, peanuts, clover, etc.) produce nodules in their roots that house bacteria from the genus Rhizobium. The bacteria turn atmospheric N into ammonium, while the Legume feeds sugar to the bacteria. Alder trees have a similar relationship with an actinomycete, Frankia. Some free-living bacteria also fix atmospheric nitrogen and convert it into useful forms in the soil.

OBS

symbiotic: [From "symbiosis" which means] the intimate living together of two dissimilar organisms in any of various mutually beneficial relationships.

French

Domaine(s)
  • Écosystèmes
CONT

[...] la plante hôte (la légumineuse) offre un micro habitat exceptionnellement favorable à la bactérie tout en lui procurant des substrats carbonés provenant de la photosynthèse. En retour, la bactérie fixe l'azote atmosphérique (N2) et le fournit à la plante hôte sous forme assimilable NH3 [...] Cette association à bénéfice réciproque entre la légumineuse et les bactéries est appelée symbiose permettant une fixation symbiotique de l'azote de l'atmosphère.

Spanish

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