The areA(r) mutations of Aspergillus nidulans confer low pH sensitivity in the presence of ammonium as the only nitrogen source

Abstract

The utilization of nitrogen sources by the fungus Aspergillus nidulans is controlled by a mechanism mediated by areA, a wide domain regulatory gene. It has been verified that the strains carrying the mutant allele areA(r) are inhibited when growing at low pH in the presence of ammonium as the only nitrogen source. The genetic analysis Of this marker showed that it apparently maps at the areA locus.