Suppression of the ΔmobA null mutation and the temperature-sensitive sepH 1 mutation by smo mutations. (A) The control (LB04), ΔmobA, smoA164, and smoB101 strains; ΔmobA smoA164 and smoB101ΔmobA double-mutant strains were grown on rich medium at 37°. Note that the ΔmobA strain formed fluffy colonies with no sign of conidiation. smoA164 and smoB101 mutations restored conidiation in the genetic background of mobA null mutation. (B) The control (LB04), sepH 1, smoA137, and smoB101 strains; sepH 1 smoA137 and sepH 1 smoB101 double-mutant strains were inoculated on duplicate plates and grew at either 30° or 42°. Note that the sepH 1 mutation abolished conidiation at 42° due to the failure of septation. The smoA137 and smoB101 mutations restored conidiation in the presence of the sepH 1 mutation at 42°. Note that the slow-growth phenotypes caused by smoA and smoB mutations were also suppressed by the sepH 1 mutation.