FIGURE 1.

Requirement of mtrA for the formation of aerial hyphae in S. coelicolor. (A) Phenotypes of the S. coelicolor wild-type strain M145, the mtrA deletion mutant ΔmtrA, and the mtrA-complemented strain C-ΔmtrA grown at 30°C on solid MS (7 days), R2 (6 days), and R5 (6 days) media. (B) SEM images of M145, ΔmtrA, and C-ΔmtrA after growth on MS agar for 5 days. Images reveal the classic ‘bald’ phenotype for the deletion mutant and normal aerial hyphae for the wild-type and complemented strains. The scale bar is 10 μm.