Nitrogen fixation - Nitrogen fixing bacteria ~ (A) Symbioti | Vbiotonic for NEET

Nitrogen fixation - Nitrogen fixing bacteria ~

(A) Symbiotically – Some bacteria live symbiotically and do nitrogen fixation.
e.g. · Rhizobium – found in the root nodules of legumes
· Azorhizobium – found in the stem nodules of Sesbania plant
· Azospirillum – Found on root surface of cereals i.e., superficial symbiosis (eg. Wheat, Rice, Maize).
· Frankia (Filamentous bacteria or actinomycetes) - It is found In root nodules of non leguminous
plant Casuarina and Alnus plants.

(B) Asymbiotically – Some bacteria are found freely in soil and do nitrogen fixation.
e.g. Clostridium, Chromatium, Azotobacter, Azospirillum, Beijernickia
Rhodomicrobium, Rhodospirillum, Rhodopseudomonas

Note : Azotobacter and Beijernickia are aerobic Rhodospirillum is anaerobic bacteria. Both
Rhizobium and Frankia are free living in soil, but as symbionts, can fix atmospheric nitrogen.

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