Arun
Last Activity: 5 Years ago
Frankia, aerobic Gram-positive actinomycetes can induce root nodules in about 8 families. These bacteria cannot fix nitrogen in free living state. They can infect the host root by intracellularly by infecting curled root hair or intercellularly by penetrating between two rhizoderm cells and then progress toward cortical cells. These bacteria in free-living state form diazovesicles containing nitrogenase which is protected from oxygen by a series of laminated lipid layers.
So all the statements are correct.