May act as a scaffolding protein within caveolar membranes, functionally participating in formation of caveolae or caveolae-like vesicles (By similarity). Required for early symbiotic events and nodules formation. In puncta evenly distributed in the cell membrane of root hair cells and polarly localized in root epidermal cells. No changes of localization upon inoculation with bacteria. Expressed in flowers in green pods. 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 nodulation. May be palmitoylated. Belongs to the band 7/mec-2 family. Flotillin subfamily.