The Transcriptional Repressor TupA in Aspergillus niger Is Involved in Controlling Gene Expression Related to Cell Wall Biosynthesis, Development, and Nitrogen Source Availability
Figure 2
The effects of growth temperature and nitrogen source on pigment formation in the tupA mutant.
High temperatures (37°C) and nitrate are required for optimal production of the pigment. Note also the strong reduction of conidiospores on top of the vegetative mycelium in the tupA mutant grown on ammonium as nitrogen source. Pictures taken after 3 days.