Bacteria Genomes - MESORHIZOBIUM LOTI

Rhizobium, Bradyrhizobium, Mesorhizobium, Sinorhizobium, and Azorhizobium - collectively known as rhizobia, are Gram-negative , nitrogen-fixing bacteria of agronomic importance because they perform nitrogen-fixing symbioses with leguminous plants (soybean, alfalfa, beans, peas, etc.).

Nodule formation (on the stem or the root of the plant) is the result of tissue proliferation induced by the rhizobia via growth promoters (e.g., cytokines) enabling the plant to convert gaseous nitrogen into combined nitrogen. This fixation process leads to significant increases in combined nitrogen in the soil

Mesorhizobium loti is a member of rhizobia which is able to form determinant-type globular nodules and perform nitrogen-fixation on several Lotus species.

References:

DNA Res 2000, 7 (6):331-8
http://www.kazusa.or.jp/rhizobase/about.html
http://www.ebi.ac.uk/integr8/QuickSearch.do?action=doOrgSearch&organismName=Mesorhizobium+loti