Which among the following bacteria play a role in the process of denitrification?

Understanding Denitrification Denitrification is a microbially facilitated process where nitrates ($NO_3^-$) are reduced and ultimately converted into gaseous nitrogen ($N_2$). This process completes the nitrogen cycle by returning nitrogen to the atmosphere. Pseudomonas and Thiobacillus are the primary genera of bacteria responsible for this process.These are generally facultative anaerobes, meaning they perform denitrification in anaerobic conditions (low oxygen), such as waterlogged soils.