Figure 1.Solanum lycopersicum (76R) roots colonized with Glomus fasciculatum showing (A) arbuscules and (B) extraradical hyphae. Both these features were also observed in the colonization deficient mutant (rmc) but at a much lower frequency (see Table 2). The roots were cleared and stained with Trypan blue, 52 d after inoculum application. Bar = 25μm (A), 150μm (B).