FIG. 4.

Spatial expression of the catA::lacZ reporter gene in wild-type strains and a stuA developmental mutant during conidiation. Developmentally wild-type strains TRN3 (A) and PW1 (B) and stuA mutant strain CRN2 (C) were grown in petri dishes until colonies conidiated, stained with X-Gal, and examined microscopically as reported previously (2, 3). Blue-stained cell types in conidiophores shown in panel A correspond to metulae, phialides, and conidia. Blue-stained cell types in panel C correspond to conidia formed on top of the vesicle of a stunted conidiophore. Magnifications: ×240 (A and B) and ×480 (C).