Fig. 4From: Microbial diversity composition of apple tree roots and resistance of apple Valsa canker with different grafting rootstock typesVenn diagrams illustrating the number of fungal OTUs in different groups. (a) Standard rootstocks (H) and dwarfing rootstocks (L); (b) Disease (Vm) and health (nVm); (c) Root endophyte (R), root rhizosphere soil (RS) and root zone soil (RZ); (d) Endophyte (E) and soil (root rhizosphere soil and root zone soil, S). Values represent the number of OTUsBack to article page