The most thoroughly studied known bacteria- plant interactions is ,

Options

A. Nodulation of Sebania stems by nitrogen fixing bacteria
B. Plant growth stimulation by phosphate-solubilising bacteria
C. Cyanobacterial symbiosis with some aquatic ferns
D. Gall formation on certain angiosperms by Agrobacterium

Answer

D

Explanation

Agrobacteria tumefaciens is called natural plant genetic engineer. Its interaction with plants are most thoroughly studied amongst the four options given in the question