FIG. 6.

Fluorescence micrographs of the wild-type strain and ssfR null mutant SKK2663 after phosphate starvation in submerged culture. Cells of S. griseus that had been induced to sporulate for 4 h were exposed to only PI or both Flu-APA and PI. (A) Wild-type strain treated with PI; (B) ssfR null mutant SKK2663 treated with both Flu-APA and PI; (C) ssfR null mutant SKK2663 treated with only PI. Yellow arrow (A), sporogenic hypha; blue arrows (B), sporulation septum labeled with Flu-APA; green arrows (C), sporulation compartments. Bar, 5 μm.