Azospirillum brasilense is a bacterium of the genus Azospirillum used in agriculture as a biofertilizer and plant growth promoter. Here are some of the specific characteristics and roles ofAzospirillum brasilense in agriculture :

1. Biological nitrogen fixation : Azospirillum brasilense is able to fix atmospheric nitrogen in the soil, converting it into a form that plants can use. This provides plants with an additional source of nitrogen, essential for growth.

2. Stimulation of root growth : The inoculation of plant roots by Azospirillum brasilense leads to beneficial changes in root architecture. This results in an increase in the number of rootlets and root length, promoting better soil exploration and increased nutrient uptake.

3. Phytohormone production : Azospirillum brasilense is known for its ability to produce phytohormones, such as auxins, which play a key role in plant growth and development. These hormones can induce growth responses in plants, promoting the formation of new roots and stimulating other physiological processes.

4. Improved resistance to stress : In addition to its beneficial effects on plant growth, Azospirillum brasilense helps boost plant resistance to stress, including abiotic stresses such as drought. This makes it an important tool for improving crop resilience under difficult environmental conditions.

In short, the use ofAzospirillum brasilense in agriculture aims to promote plant growth, improve crop nutrition by fixing atmospheric nitrogen, and boost plant resilience to various environmental stresses.