Mycorrhizal fungi and N-Fixation

[BobHarAmes]

I've worked on rhizobia, N2-fixation, N-transfer by VAM from soil to the host,
and also with tomato but never have seen nodules on tomato except nematodes.  I
suspect they may have actually observed root knot nematode on tomato and
confused it with rhizobia.  Were x-sections made of the tissue or rhizobium
cultured from surface disinfected nodules?  I'm skeptical also.  Dr. Bob Ames.