Figure 1.

Endophytes inside plant tissues detected trough fluorescence microscopy techniques. (A) Epifluorescence image on transverse sections of a Centaurea horrida stem stained by propidium iodide. Arrow: endophytic bacterium cell adhering to a vessel within the plant’s vascular system. Bar = 15 μm. (B) Optical microscopy of basic fuchsin/astra blue double-stained longitudinal thin sections from a Hedysarum glomeratum root in proximity to the crown. Endophytic bacteria (indicated by the arrow) are distinguishable within a xylem vessel. Bar = 10 μm.