Azotobacter beneficial microbes

#Azotobacter​ # Beneficial Microbes
#Genus​ of free-living diastrophic bacteria
#Description​
# Significance
#Advantages​ of azotobacterial
#Nitrogen​ fixation
#NITROGEN​ CYCLE

1. Azotobacter : Beneficial Microbes Presented by: Khushbu’s Microbiology

2. Genus of usually  motile Oval or spherical  bacteria   Thick-walled  cysts  May produce large quantities of capsular   slime. Azotobacter  species cells : stained with Heidenhain's iron hematoxylin, ×1000 Azotobacter  

3. Description Genus of free-living diastrophic bacteria whose resting stage is a cyst . It is primarily found in neutral to alkaline soils , Aquatic environments, and on some plants . IMAGE : Azotobacter  cyst. 

4. Significance It has several metabolic capabilities : including atmospheric nitrogen fixation by conversion to ammonia. Their unique system of three distinct nitrogenase enzymes makes these bacteria of particular interest to scientists, who may work toward a better understanding of nitrogen fixation and its role in agriculture.  Azotobacter   spp: the highest metabolic rate of any organisms.

5. Advantages of Azotobacter: Heaviest breathing organism and requires a large amount of organic carbon for its growth. Competitor for nutrients in soil Growth promoting substances Fungistatic substances.

6. Nitrogen fixation Azotobacter  species are free-living, nitrogen-fixing bacteria; in contrast to  Rhizobium  species, They normally fix molecular nitrogen from the atmosphere without symbiotic relations with plants, some   Azotobacter  species are associated with plants .  Nitrogen fixation is inhibited in the presence of available nitrogen sources, such as ammonium ions and nitrates .

7. Nitrogen fixation Azotobacter  species have a full range of enzymes needed to perform the nitrogen fixation:  ferredoxin,   hydrogenase, important enzyme  nitrogenase . The process of nitrogen fixation requires an influx of energy in the form of adenosine triphosphate

8. NITROGEN CYCLE

9. THANKS