Lignin staining (Phluoroglucinol) of developing stem under normal as well as stressed conditions. (a, b, c). Control 8, 12 and 15 days samples, respectively. (d, e, f). Mannitol (1 %) treated 8, 12 and 15 days samples, respectively. (f, g, h). NaCl (200 mM) treated 8, 12 and 15 days samples, respectively. All pictures were taken at 40×magnification