Gram-negative nitrogen-fixing bacteria found in association with plant roots are
A) betaproteobacteria.
B) cyanobacteria.
C) gammaproteobacteria.
D) alphaproteobacteria.
E) deeply branching bacteria.

Question

Quizplus · Accepted Answer

Alphaproteobacteria include Rhizobium and related genera, which are known for their nitrogen-fixing abilities in association with plant roots.

Gram-Negative Nitrogen-Fixing Bacteria Found in Association with Plant Roots Are