Azotobacter

Definition

Azotobacter is a genus of free-living nitrogen-fixing bacteria found in soil. It plays a crucial role in converting atmospheric nitrogen into ammonia, which is essential for plant growth.

5 Must Know Facts For Your Next Test

1. Azotobacter can fix atmospheric nitrogen without being in a symbiotic relationship with plants.
2. They are aerobic bacteria, meaning they require oxygen to survive and thrive.
3. These bacteria produce thick-walled cysts that help them survive in unfavorable conditions.
4. Azotobacter secretes substances like vitamins and growth hormones that promote plant growth.
5. They are used in biofertilizers due to their ability to increase the nitrogen content of the soil.

Review Questions

• What role does Azotobacter play in the nitrogen cycle?
• How does Azotobacter survive in harsh environmental conditions?
• Why is Azotobacter considered beneficial for agriculture?

Related terms

Nitrogen Fixation: The process of converting atmospheric nitrogen into a form usable by plants.

Biofertilizer: A substance containing living microorganisms which promote plant growth by increasing the availability of primary nutrients.

Cyst: A thick-walled structure produced by some bacteria, including Azotobacter, to withstand adverse conditions.