Question

Which nitrogen fixing bacteria amongst the following is found in root association of maize?

• A. Aulosira
• B. Azotobacter
• C. Azospirillum
• D. All of the above

Answer 1

The correct option is C Azospirillum

The members of Azospirillum genus take part in nitrogen fixation under microaerophilic conditions. They are mostly associated with the roots and rhizospheres of a large number of agriculturally important crops and cereals. Azospirillum can enhance the growth of plants and yield a wide range of economically important crops in different types of soil and climatic conditions. The beneficial aspects of Azospirillum are for the production of phytohormones, reduction of nitrate and nitrogen fixation. They are known to be associated with diazotrophs. Despite, the property of nitrogen fixation they also attribute to the development of root as they produce growth promoting substances and increase the rate of water and mineral intake. For example- in maize plants.

So, the correct answer is option C.