Figure 1. Appearance of A. thaliana plantlets infected with U. maydis strains. General aspect of plants inoculated with the FB2 haploid strain (A–C), or the Uid1 diploid strain (D–F) at 2, 4 or 8 d post-infection respectively. Notice in (B) the necrotic area (arrow), in (C) necrotic tissue detachment (arrow) and in (F) necrotic tissue points in the infected plantlets. (G) Severe alteration in the root system in haploid-infected plantlets 20 dpi. (H) Mycelium of the haploid strain entering through stomata (red arrow).(I) mycelium of the haploid strain growing within the infected tissue. (J–L) Aspect of roots and leaves of control not-inoculated plantlets. Scale bar in (H) and (I), 20 μm.