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The latest Messages 23
2021-07-21 17:42:19
#MOSTimp Point on ^Nitrogen fixation-Nitrogen fixing bacteria^#FROMNCERT #NEET2021
(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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2021-07-21 14:54:12
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