May act as a scaffolding protein within caveolar membranes, functionally participating in formation of caveolae or caveolae-like vesicles (By similarity). Required for normal infection threads initiation and elongation and nodulation. Probably involved in polar growth of the infection thread. In puncta evenly distributed in the cell membrane of root hair and epidermal cells. Accumulates in the tips of elongating root hairs and localizes to the infection thread membranes upon inoculation with bacteria. Expressed in roots and nodules. Primarily expressed in vascular tissues. Upon induction of nodulation, expansion of expression in the root cortex in the region of elongating root hairs, which will eventually become colonized by bacteria. Expressed in the infection zone in nodules. Up-regulated during the first 7 days of nodulation. The predicted palmitoylation site present in all other flotillin-like proteins is not conserved. Belongs to the band 7/mec-2 family. Flotillin subfamily.