Endophytic colonization of a plant growth-promoting bacterium (Burkholderia phytofirmans PsJN) observed via fluorescence in situ hybridization (a) or with gfp tagging
(b) showing bacterial cells as green rods inside cortex (a) or xylem vessels (b) with green fluorescence. Scale bars: (a) 25 mm, and (b) 10 mm. Pictures by S. Compant. Picture b from
Compant et al. (2008a) with permission.