Figure 6

Scanning electron microscope images of infection sites of Lu10-1 in roots of mulberry seedling. (a) Colonization of the surface of the root hair zone. (b) Magnified image of the framed region shown in Fig. 5a. (c) Colonization of the sites of root hair emergence. (d) Colonization of the surface of root hair. (e) Lu10-1 cells directly enter the cortex through epidermis in the root hair zone of primary roots. (f) Lu10-1 cells heavily colonize the junctions of primary root with secondary roots. (g) Magnified image of the framed region shown in Fig. 6f. (h) Large-scale colonization of the surface of the zone of elongation. (i) Magnified image of the framed region shown in Fig. 6 h. (j) Colonization of the root meristematic zone. (k) Lu10-1 cells within the depressions formed between epidermal cells as the framed region shown in Fig. 6j. (l) Lu10-1 cells on the surface of the root tip. (m) Magnified image of the framed region shown in Fig. 6l. (n) Lu10-1 cells anchored within the cracks and depressions formed between epidermal cells of primary roots. (o) Magnified image of the framed region shown in Fig. 6n. (p) Numerous cells of Lu10-1 beneath the root epidermis. (q) No bacterial cells were found in the epidermal cells. (r) Zone of root hair in control seedling. (s) Zone of elongation in control seedlings. (t) Optisection of the primary root of a control seedling.