Fig. 4

Light micrographs of transverse (a, d), radial (b) and tangential (c, e) sections of black regions of samples of D. kaki wood. White arrowheads indicate colored substances in blind pits of ray parenchyma cells that faced intercellular spaces. Red arrowheads indicate colored substances in pits between ray parenchyma cells. Blue arrowheads indicate colored substances leaking from blind pits into intercellular spaces. White arrows indicate colored substances in pits. Black arrows indicate colored substances in intercellular spaces. AP: axial parenchyma cell; F: wood fiber; RP: ray parenchyma cell; V: vessel element. Scale bars = 100 μm in a–d; 50 μm in e