How azotobacter and rhizobium there nitrogenase from oxygen?
Answers
Answer:
To protect nitrogenase from inactivation by oxygen, a variety of mechanisms operate in diazotrophs (7, 15, 21). In Azotobacter species, two major mechanisms are believed to contribute to the protection of nitrogenase, increased respiration and conformational protection.
Explanation:
Nitrogenase is rapidly destroyed by oxygen, in vitro and in vivo, so nitrogen-fixing organisms face the problem of protecting their nitrogenase from inactivation by oxygen. The need to protect nitrogenase becomes particularly important in the cyanobacteria, which evolve oxygen photosynthetically.
Answer:
Explanation:
Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime. They are aerobic, free-living soil microbes which play an important role in the nitrogen cycle in nature, binding atmospheric nitrogen, which is inaccessible to plants, and releasing it in the form of ammonium ions into the soil (nitrogen fixation). In addition to being a model organism for studying diazotrophs, it is used by humans for the production of biofertilizers, food additives, and some biopolymers. The first representative of the genus, Azotobacter chroococcum, was discovered and described in 1901 by the Dutch microbiologist and botanist Martinus Beijerinck. Azotobacter species are Gram-negative bacteria found in neutral and alkaline soils,[1][2] in water, and in association with some plants